Custom Engineered Solar Thermal Products EPC Guide | SOLETKS<\/title><br \/>\n<meta name=\"description\" content=\"Custom engineered solar thermal products guide for EPC projects: OEM\/ODM collectors, drawings, test data, compliance, lifecycle and RFQ inputs.\">\n<link rel=\"canonical\" href=\"https:\/\/service.soletksolar.com\/custom-engineered-solar-thermal-products\/\">\n<meta property=\"og:title\" content=\"Custom Engineered Solar Thermal Products for EPC Projects\"><br \/>\n<meta property=\"og:description\" content=\"A custom solar thermal engineering guide for EPC projects, OEM\/ODM collectors, drawings, test data, compliance mapping, lifecycle, and RFQ inputs.\"><br \/>\n<meta property=\"og:type\" content=\"article\"><br \/>\n<meta property=\"og:url\" content=\"https:\/\/service.soletksolar.com\/custom-engineered-solar-thermal-products\/\"><br \/>\n<meta property=\"og:image\" 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.block{padding:23px 20px;margin:28px 0}\n .workflow-strip,.calc-steps,.family-grid,.image-grid,.doc-grid,.rfq-grid{grid-template-columns:1fr}\n .cta{padding:26px 20px}\n }\n<\/style>\n<p><\/head><body><\/p>\n<section class=\"engineering-hero\">\n<div class=\"hero-inner\">\n<div class=\"crumbs\">\n <a href=\"https:\/\/service.soletksolar.com\/\">Home<\/a><br \/>\n <span>\/<\/span><br \/>\n <a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector-products\/\">Solar Collector Products<\/a><br \/>\n <span>\/<\/span><br \/>\n <span>Custom Engineering<\/span>\n <\/div>\n<p> <span class=\"kicker\">OEM \/ ODM \/ EPC product engineering<\/span><\/p>\n<h1>Custom Engineered Solar Thermal Products for EPC Projects<\/h1>\n<p class=\"lead\">Define custom solar thermal products by measurable project constraints: thermal target, interface dimensions, standards, drawings, sample approval, inspection records, packaging, and lifecycle support.<\/p>\n<div class=\"workflow-strip\">\n<div><b>3-5 days<\/b><span>requirement freeze after complete RFQ<\/span><\/div>\n<div><b>5-10 days<\/b><span>simple engineering drawing planning interval<\/span><\/div>\n<div><b>2-4 weeks<\/b><span>sample or pilot unit when physical proof is needed<\/span><\/div>\n<div><b>20 modules<\/b><span>worked example custom RFQ starting point<\/span><\/div>\n<div><b>30 days<\/b><span>installation feedback window after arrival<\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n<nav class=\"nav-strip\" aria-label=\"Article sections\">\n<div class=\"nav-inner\">\n <a href=\"#answer\">Custom Answer<\/a><br \/>\n <a href=\"#scope\">Scope Calculation<\/a><br \/>\n <a href=\"#families\">Product Families<\/a><br \/>\n <a href=\"#documents\">Documents<\/a><br \/>\n <a href=\"#prototype\">Prototype<\/a><br \/>\n <a href=\"#standards\">Standards<\/a><br \/>\n <a href=\"#risks\">Risks<\/a><br \/>\n <a href=\"#rfq\">RFQ<\/a><br \/>\n <a href=\"#checklist\">Checklist<\/a><br \/>\n <a href=\"#faq\">FAQ<\/a>\n <\/div>\n<\/nav>\n<p><main class=\"content\"><\/p>\n<article>\n<div class=\"intro\">\n<div>\n<p>By <strong>SOLETKS Engineering Team<\/strong>, the solar thermal product engineering group that supports collector selection, documentation, and project quotation for B2B solar thermal applications.<\/p>\n<p><strong>Custom engineered solar thermal products<\/strong> are useful when a distributor, EPC contractor, or project owner needs a collector, mounting package, tank interface, air-heating unit, control package, or OEM\/ODM configuration that standard catalog pages do not fully cover.<\/p>\n<p>The right custom scope starts with load data, installation constraints, destination standards, drawings, sample plan, quality records, packaging, and after-sales documents. Use SOLETKS’ <a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector-products\/\">Solar Collector Products<\/a> page to compare product families, and use the <a href=\"https:\/\/service.soletksolar.com\/products\/commercial-industrial-solar-hot-water-system\/\">Commercial \/ Industrial Solar Hot Water System<\/a> page when the custom product belongs to a larger hot-water plant.<\/p>\n<\/p><\/div>\n<figure class=\"factory-img\">\n <img decoding=\"async\" src=\"https:\/\/service.soletksolar.com\/wp-content\/uploads\/2025\/11\/494685619_1404751250597164_7706161979368977777_n.jpg\" alt=\"SOLETKS clean energy manufacturing facility for custom engineered solar thermal products\"><figcaption>Custom engineering should connect factory capability with the actual EPC constraint, not add changes for their own sake.<\/figcaption><\/figure>\n<\/p><\/div>\n<section id=\"answer\" class=\"block tint\">\n <span class=\"label\">Custom Engineering Answer<\/span><\/p>\n<h2>Change Only What the Project Requires<\/h2>\n<div class=\"answer\"><strong>Use a standard product<\/strong> when only quantity, destination, or label changes. Use a custom engineered scope when the EPC design has a measurable constraint such as roof row spacing, duct connection size, tank room height, freeze temperature, working pressure, or control-panel standard.<\/div>\n<p>The useful custom question is precise: which requirement cannot be solved by the standard product? Common answers include mounting geometry, manifold direction, absorber coating, airflow connection, tank interface, packaging size, documentation language, project branding, control cabinet scope, or compliance documents.<\/p>\n<p>A vague custom request raises cost and slows engineering because every change must be drawn, sampled, tested, packed, and documented.<\/p>\n<\/section>\n<section id=\"scope\" class=\"block\">\n <span class=\"label\">Thermal Scope First<\/span><\/p>\n<h2>Custom Scope Calculation<\/h2>\n<p>An EPC quote should calculate the thermal scope before asking for a custom drawing. This worked example uses a screening collector-area method; final design should use project weather data, product test data, and system loss assumptions.<\/p>\n<div class=\"calc-board\">\n<div class=\"calc-input\">\n<h3>Example input<\/h3>\n<ul>\n<li>Process preheat target: <strong>120 kWh\/day<\/strong><\/li>\n<li>Useful solar yield: <strong>3.5 kWh\/m2\/day<\/strong><\/li>\n<li>Candidate module area: <strong>2.0 m2<\/strong><\/li>\n<li>Design spare allowance: <strong>10%<\/strong><\/li>\n<\/ul><\/div>\n<div class=\"calc-steps\">\n<div class=\"calc-step\"><span>1<\/span><\/p>\n<h4>Collector area<\/h4>\n<p><code>120 \/ 3.5<\/code><b>34.3 m2<\/b><\/div>\n<div class=\"calc-step\"><span>2<\/span><\/p>\n<h4>Base module count<\/h4>\n<p><code>34.3 \/ 2.0<\/code><b>17.2 modules<\/b><\/div>\n<div class=\"calc-step\"><span>3<\/span><\/p>\n<h4>Round up<\/h4>\n<p><code>ceil(17.2)<\/code><b>18 modules<\/b><\/div>\n<div class=\"calc-step\"><span>4<\/span><\/p>\n<h4>Spare-adjusted<\/h4>\n<p><code>18 x 1.10<\/code><b>19.8 modules<\/b><\/div>\n<div class=\"calc-result\"><strong>Recommendation:<\/strong> start the custom RFQ at <strong>20 modules<\/strong> and ask SOLETKS whether a standard module, modified manifold, or custom frame gives the best fit. If the EPC layout has only <strong>32 m2<\/strong> usable roof area, solve the area constraint before changing absorber or frame design.<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n<section id=\"families\" class=\"block\">\n <span class=\"label\">Product Family Boundary<\/span><\/p>\n<h2>Customization Boundaries by Product Family<\/h2>\n<p>Custom work should be matched to the product family because air collectors, water collectors, and hybrid systems have different risk points. Mechanism matters: a small manifold change alters pressure drop, while a duct-flange change alters air velocity and fan power.<\/p>\n<div class=\"family-grid\">\n<div class=\"family-card\">\n<h3><a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector\/flat-plate-solar-collector\/\">Flat plate water collector<\/a><\/h3>\n<p>Frame color, manifold direction, mounting kit, packaging. Control pressure rating and test evidence.<\/p>\n<\/div>\n<div class=\"family-card\">\n<h3><a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector-products\/\">Large flat plate collector<\/a><\/h3>\n<p>Project frame, row connection, transport method. Control roof load and handling path.<\/p>\n<\/div>\n<div class=\"family-card\">\n<h3><a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector\/afpc-solar-air-collector\/\">Air collector<\/a><\/h3>\n<p>Duct flange, airflow direction, insulation, filter access. Control pressure drop and leakage.<\/p>\n<\/div>\n<div class=\"family-card\">\n<h3><a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector\/atpc-hot-air-collector\/\">Hot-air collector<\/a><\/h3>\n<p>High-temperature ducting, bypass damper, backup interlock. Control overheating and logic.<\/p>\n<\/div>\n<div class=\"family-card\">\n<h3><a href=\"https:\/\/service.soletksolar.com\/products\/commercial-industrial-solar-hot-water-system\/\">Commercial package<\/a><\/h3>\n<p>Tank interface, heat exchanger, pump station, controls. Control hydraulic balance and backup priority.<\/p>\n<\/div><\/div>\n<div class=\"image-grid\">\n<figure class=\"image-card\">\n <img decoding=\"async\" src=\"https:\/\/service.soletksolar.com\/wp-content\/uploads\/2025\/11\/flat-plate-solar-collector.jpg\" alt=\"Flat plate solar collector for custom engineered solar thermal product planning\"><figcaption><a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector\/flat-plate-solar-collector\/\">Flat plate water-collector<\/a> custom work should preserve pressure rating, test basis, and installation interface.<\/figcaption><\/figure>\n<figure class=\"image-card\">\n <img decoding=\"async\" src=\"https:\/\/service.soletksolar.com\/wp-content\/uploads\/2025\/11\/Air-solar-collector.jpg\" alt=\"Solar air collector for custom duct and airflow engineering scope\"><figcaption><a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector\/afpc-solar-air-collector\/\">Air collector<\/a> customization needs airflow, duct flange, filter access, and leakage control.<\/figcaption><\/figure>\n<figure class=\"image-card\">\n <img decoding=\"async\" src=\"https:\/\/service.soletksolar.com\/wp-content\/uploads\/2025\/11\/PVT.jpg\" alt=\"PVT solar thermal product image for custom hybrid solar applications\"><figcaption><a href=\"https:\/\/service.soletksolar.com\/products\/pvt-hybrid-solar-systems\/\">PVT hybrid products<\/a> need clearer boundaries because electrical, thermal, mounting, and controls can overlap.<\/figcaption><\/figure>\n<\/p><\/div>\n<\/section>\n<section id=\"documents\" class=\"block dark\">\n <span class=\"label\">Document Package<\/span><\/p>\n<h2>Engineering Document Package<\/h2>\n<p>A custom product should have a document package before production approval. <a href=\"https:\/\/service.soletksolar.com\/company\/quality-assurance\/\">SOLETKS quality assurance materials<\/a> describe procurement, design, manufacturing, integration, testing, delivery, and export packaging processes.<\/p>\n<div class=\"doc-grid\">\n<div>Product datasheet with model, size, weight, pressure, temperature range.<\/div>\n<div>General arrangement drawing with dimensions in mm.<\/div>\n<div>Mounting or connection drawing.<\/div>\n<div>Hydraulic or airflow interface drawing.<\/div>\n<div>Electrical drawing when a control panel is included.<\/div>\n<div>Certificate copies tied to the exact supplied scope.<\/div>\n<div>Packing list and container loading direction.<\/div>\n<div>Installation, maintenance, commissioning, or factory inspection record.<\/div>\n<\/p><\/div>\n<p style=\"margin-top:18px;\">The document package prevents the most common custom-project failure: the buyer approves a price while the installer, warehouse, and commissioning team each assume a different interface.<\/p>\n<\/section>\n<section id=\"prototype\" class=\"block\">\n <span class=\"label\">Controlled Stages<\/span><\/p>\n<h2>Prototype, Production, and Lifecycle Matrix<\/h2>\n<p>Custom engineering should move through controlled stages because every design change has a cost, schedule, and maintenance effect. The final lead time depends on model, tooling, test scope, order volume, and shipping method.<\/p>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>Stage<\/th>\n<th>Typical planning interval<\/th>\n<th>Output record<\/th>\n<th>Lifecycle effect<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Requirement freeze<\/td>\n<td>3-5 working days after complete RFQ<\/td>\n<td>Load, drawing, standard, packaging scope<\/td>\n<td>Prevents late rework<\/td>\n<\/tr>\n<tr>\n<td>Engineering drawing<\/td>\n<td>5-10 working days for simple changes<\/td>\n<td>GA drawing and interface drawing<\/td>\n<td>Locks dimensions before sampling<\/td>\n<\/tr>\n<tr>\n<td>Sample or pilot unit<\/td>\n<td>2-4 weeks when physical sample is required<\/td>\n<td>Sample inspection and photo record<\/td>\n<td>Reduces first-batch installation risk<\/td>\n<\/tr>\n<tr>\n<td>Factory inspection<\/td>\n<td>Before shipment; 1 record per batch<\/td>\n<td>Visual, dimension, packing, label record<\/td>\n<td>Creates baseline for warranty discussion<\/td>\n<\/tr>\n<tr>\n<td>Installation feedback<\/td>\n<td>Within 30 days after arrival<\/td>\n<td>Site photos and issue log<\/td>\n<td>Improves next batch or project phase<\/td>\n<\/tr>\n<tr>\n<td>Lifecycle review<\/td>\n<td>12 months after commissioning for repeat projects<\/td>\n<td>Maintenance and failure notes<\/td>\n<td>Guides design life and TCO decisions<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<div class=\"note\">SOLETKS’ Saga County centralized solar heating project is published as a 107,000 m2 heating-coverage reference with 2,424 tons\/year coal reduction, showing that EPC discussions should include scale, thermal target, and long-term operation evidence.<\/div>\n<\/section>\n<section id=\"standards\" class=\"block\">\n <span class=\"label\">Compliance Map<\/span><\/p>\n<h2>Standards and Compliance Mapping<\/h2>\n<p>Compliance mapping should be done before custom production because changing a material, control panel, or pressure boundary affects documents. Request model-specific documents; management-system certificates do not replace product test reports.<\/p>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>Standard or certificate<\/th>\n<th>Custom-product relevance<\/th>\n<th>RFQ rule<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>ISO 9806:2017<\/td>\n<td>Solar thermal collector performance<\/td>\n<td>Use for collector test-data basis.<\/td>\n<\/tr>\n<tr>\n<td>ISO 9001<\/td>\n<td>Supplier quality management<\/td>\n<td>Use for factory-process qualification.<\/td>\n<\/tr>\n<tr>\n<td>ISO 14001<\/td>\n<td>Environmental management<\/td>\n<td>Use where procurement scores factory systems.<\/td>\n<\/tr>\n<tr>\n<td>ISO 45001<\/td>\n<td>Occupational health and safety management<\/td>\n<td>Use for supplier-system qualification.<\/td>\n<\/tr>\n<tr>\n<td>CE<\/td>\n<td>EU conformity route<\/td>\n<td>Use when the destination and scope require it.<\/td>\n<\/tr>\n<tr>\n<td>UL 508A<\/td>\n<td>Industrial control panel<\/td>\n<td>Use when the supplied panel falls into UL panel scope.<\/td>\n<\/tr>\n<tr>\n<td>ASME BPVC<\/td>\n<td>Pressure vessels or governed pressure parts<\/td>\n<td>Use for tanks, vessels, or heat exchangers under pressure rules.<\/td>\n<\/tr>\n<tr>\n<td>EN 12975<\/td>\n<td>Legacy European collector context<\/td>\n<td>Use only when the buyer requests legacy test references.<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n<section id=\"risks\" class=\"block tint\">\n <span class=\"label\">Procurement Control<\/span><\/p>\n<h2>Procurement Risks and Controls<\/h2>\n<p>Custom products need tighter procurement control because a small interface error becomes expensive after shipment. These controls reduce risk because the buyer, SOLETKS, freight forwarder, and installer all work from the same record.<\/p>\n<ul>\n<li>Freeze the drawing revision and write the revision code on the proforma invoice.<\/li>\n<li>Put model, quantity, color, dimensions, port direction, and packaging into the purchase document.<\/li>\n<li>Request a sample photo set or inspection photo set for custom visible parts.<\/li>\n<li>Require packing protection for glass, absorber plates, frame corners, and control components.<\/li>\n<li>Put destination standards and document language into the RFQ.<\/li>\n<li>Define whether the order is OEM, ODM, private label, or project-specific supply.<\/li>\n<li>State whether spare tubes, seals, sensors, or controllers ship with the first batch.<\/li>\n<\/ul>\n<div class=\"image-grid\">\n<figure class=\"image-card\">\n <img decoding=\"async\" src=\"https:\/\/service.soletksolar.com\/wp-content\/uploads\/2025\/11\/1743662438978.jpeg\" alt=\"SOLETKS manufacturing and quality workflow image for custom product procurement control\"><figcaption>Visible custom details should be inspected before shipment so the first batch does not become the first real test.<\/figcaption><\/figure>\n<figure class=\"image-card\">\n <img decoding=\"async\" src=\"https:\/\/service.soletksolar.com\/wp-content\/uploads\/2025\/11\/1743662599508.jpeg\" alt=\"SOLETKS production facility image for custom engineered solar thermal products\"><figcaption>Factory inspection records create a baseline for warranty, packaging, and repeat EPC batch decisions.<\/figcaption><\/figure>\n<figure class=\"image-card\">\n <img decoding=\"async\" src=\"https:\/\/service.soletksolar.com\/wp-content\/uploads\/2025\/11\/494685619_1404751250597164_7706161979368977777_n.jpg\" alt=\"SOLETKS clean energy manufacturing facility for custom engineered solar thermal products\"><figcaption>Custom engineering should connect product family, drawing revision, standard, packaging, and after-sales support.<\/figcaption><\/figure>\n<\/p><\/div>\n<\/section>\n<section id=\"rfq\" class=\"block dark\">\n <span class=\"label\">RFQ Input Set<\/span><\/p>\n<h2>RFQ Inputs for SOLETKS<\/h2>\n<p>A custom engineered solar thermal RFQ should include load, interface, compliance, and delivery data. Send project data through the <a href=\"https:\/\/service.soletksolar.com\/contact\/\">SOLETKS contact page<\/a> and ask for engineering support before changing the standard product.<\/p>\n<div class=\"rfq-grid\">\n<div>Product family: <a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector\/flat-plate-solar-collector\/\">flat plate<\/a>, <a href=\"https:\/\/service.soletksolar.com\/products\/evacuated-tube-solar-collector\/\">evacuated tube<\/a>, <a href=\"https:\/\/service.soletksolar.com\/products\/solar-water-heater\/heat-pipe-solar-water-heater\/\">heat pipe<\/a>, <a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector\/afpc-solar-air-collector\/\">air collector<\/a>, <a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector\/atpc-hot-air-collector\/\">hot-air collector<\/a>, <a href=\"https:\/\/service.soletksolar.com\/products\/pvt-hybrid-solar-systems\/\">PVT<\/a>, tank, or <a href=\"https:\/\/service.soletksolar.com\/products\/commercial-industrial-solar-hot-water-system\/\">system package<\/a>.<\/div>\n<div>Project use: domestic hot water, hotel, school, factory preheat, drying, ventilation, or district heating support.<\/div>\n<div>Daily thermal target in kWh\/day or water volume in L\/day.<\/div>\n<div>Target temperature and cold-water or inlet-air temperature.<\/div>\n<div>Required dimensions, mounting angle, port direction, duct size, or tank interface.<\/div>\n<div>Destination country, required standards, and document language.<\/div>\n<div>Quantity for sample, pilot batch, and full project batch.<\/div>\n<div>Branding requirement: neutral, SOLETKS, OEM, or ODM.<\/div>\n<div>Packaging requirement, container target, destination port, and trade term.<\/div>\n<div>Required documents: drawings, datasheet, certificate, packing list, inspection record, installation guide.<\/div>\n<\/p><\/div>\n<\/section>\n<section id=\"checklist\" class=\"block\">\n <span class=\"label\">Custom Boundary<\/span><\/p>\n<h2>Specification Checklist<\/h2>\n<p>The specification checklist should define the custom boundary so engineering and procurement do not drift apart. Attach this checklist to the RFQ and purchase order.<\/p>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>Item<\/th>\n<th>Minimum specification<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Custom reason<\/td>\n<td>The measurable constraint that standard product cannot solve<\/td>\n<\/tr>\n<tr>\n<td>Product scope<\/td>\n<td>Collector, tank, mounting, controls, packaging, or full system<\/td>\n<\/tr>\n<tr>\n<td>Thermal target<\/td>\n<td>kWh\/day, L\/day, temperature rise, or airflow\/temperature target<\/td>\n<\/tr>\n<tr>\n<td>Interface<\/td>\n<td>Port direction, duct size, mounting hole, tank connection, wiring<\/td>\n<\/tr>\n<tr>\n<td>Compliance<\/td>\n<td>ISO 9806:2017, ISO 9001, CE, UL 508A, ASME BPVC, EN 12975 if required<\/td>\n<\/tr>\n<tr>\n<td>Sample plan<\/td>\n<td>Drawing approval, sample quantity, inspection record, approval owner<\/td>\n<\/tr>\n<tr>\n<td>Production plan<\/td>\n<td>Batch quantity, lead time, packing method, spare parts<\/td>\n<\/tr>\n<tr>\n<td>Handover<\/td>\n<td>Datasheet, drawings, installation guide, commissioning form<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n<section id=\"faq\" class=\"block tint\">\n <span class=\"label\">FAQ<\/span><\/p>\n<h2>Frequently Asked Questions<\/h2>\n<div class=\"faq-list\">\n<details>\n<summary>Is a custom engineered solar thermal product worth the added work?<\/summary>\n<div class=\"faq-body\">A custom engineered solar thermal product is worth the added work when a measurable project constraint blocks a standard model. Good reasons include port direction, mounting geometry, duct connection, pressure boundary, documentation language, packaging, or control-panel standard.<\/div>\n<\/details>\n<details>\n<summary>Does OEM or ODM change the engineering process?<\/summary>\n<div class=\"faq-body\">OEM or ODM changes the documentation and approval process because branding, label, packaging, drawing revision, and inspection records must match the buyer’s sales channel. The thermal design still needs load data, interface dimensions, standards, and test evidence.<\/div>\n<\/details>\n<details>\n<summary>What information speeds up a custom quote?<\/summary>\n<div class=\"faq-body\">A custom quote moves faster when the buyer sends thermal target, drawing, interface dimension, destination standard, quantity, branding need, packaging requirement, and delivery term in the first RFQ. Missing drawings create rework because engineering must guess dimensions.<\/div>\n<\/details>\n<details>\n<summary>Which standards matter most for custom solar thermal products?<\/summary>\n<div class=\"faq-body\">The most important standards depend on scope: ISO 9806:2017 for collector performance, ISO 9001 for supplier quality management, CE for EU conformity routes, UL 508A for applicable control panels, and ASME BPVC for governed pressure equipment.<\/div>\n<\/details><\/div>\n<\/section>\n<div class=\"sources\">\n<h2>Sources<\/h2>\n<ol>\n<li>SOLETKS solar collector products and commercial system pages: <a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector-products\/\">Solar Collector Products<\/a> and <a href=\"https:\/\/service.soletksolar.com\/products\/commercial-industrial-solar-hot-water-system\/\">Commercial \/ Industrial Solar Hot Water System<\/a>.<\/li>\n<li>Collector-area calculation is a screening method; final design should use local weather, selected model data, and project losses.<\/li>\n<li>SOLETKS <a href=\"https:\/\/service.soletksolar.com\/company\/quality-assurance\/\">quality assurance<\/a> and <a href=\"https:\/\/service.soletksolar.com\/contact\/\">contact<\/a> pages.<\/li>\n<li>Custom timing ranges are planning values and should be confirmed in the final quotation.<\/li>\n<li>SOLETKS published Saga County centralized solar heating reference: 107,000 m2 heating coverage and 2,424 tons\/year coal reduction.<\/li>\n<\/ol><\/div>\n<section class=\"cta\">\n<h2>Freeze the custom boundary before sampling<\/h2>\n<p>Send SOLETKS the product family, thermal target, drawings, interface dimensions, destination standards, quantity plan, branding requirement, packaging rules, and handover documents so the custom scope can move from RFQ to drawing to sample without drift.<\/p>\n<div class=\"btns\">\n <a class=\"btn primary\" href=\"https:\/\/service.soletksolar.com\/contact\/\">Start Custom RFQ<\/a><br \/>\n <a class=\"btn secondary\" href=\"https:\/\/service.soletksolar.com\/products\/solar-collector-products\/\">Browse Product Families<\/a>\n <\/div>\n<\/section>\n<\/article>\n<p><\/main><\/p>\n<p><script type=\"application\/ld+json\">\n{\n \"@context\": \"https:\/\/schema.org\",\n \"@graph\": [\n {\n \"@type\": \"Article\",\n \"@id\": \"https:\/\/service.soletksolar.com\/custom-engineered-solar-thermal-products\/#article\",\n \"headline\": \"Custom Engineered Solar Thermal Products for EPC Projects\",\n \"description\": \"Custom engineered solar thermal products guide for EPC projects: OEM\/ODM collectors, drawings, test data, compliance, lifecycle and RFQ inputs.\",\n \"author\": {\n \"@type\": \"Organization\",\n \"name\": \"SOLETKS Engineering Team\"\n },\n \"publisher\": {\n \"@id\": \"https:\/\/service.soletksolar.com\/#organization\"\n },\n \"datePublished\": \"2026-06-29\",\n \"dateModified\": \"2026-06-29\",\n \"mainEntityOfPage\": \"https:\/\/service.soletksolar.com\/custom-engineered-solar-thermal-products\/\",\n \"image\": \"https:\/\/service.soletksolar.com\/wp-content\/uploads\/2025\/11\/494685619_1404751250597164_7706161979368977777_n.jpg\"\n },\n {\n \"@type\": \"FAQPage\",\n \"@id\": \"https:\/\/service.soletksolar.com\/custom-engineered-solar-thermal-products\/#faq\",\n \"mainEntity\": [\n {\n \"@type\": \"Question\",\n \"name\": \"Is a custom engineered solar thermal product worth the added work?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"A custom engineered solar thermal product is worth the added work when a measurable project constraint blocks a standard model. 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{"id":1751,"date":"2026-06-29T00:00:00","date_gmt":"2026-06-29T00:00:00","guid":{"rendered":"https:\/\/service.soletksolar.com\/custom-engineered-solar-thermal-products\/"},"modified":"2026-06-29T00:00:00","modified_gmt":"2026-06-29T00:00:00","slug":"custom-engineered-solar-thermal-products","status":"publish","type":"post","link":"https:\/\/service.soletksolar.com\/vi\/custom-engineered-solar-thermal-products\/","title":{"rendered":"Custom Engineered Solar Thermal Products for EPC Projects"},"content":{"rendered":"

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\nCustom Engineered Solar Thermal Products EPC Guide | SOLETKS<\/title><br \/>\n<meta name=\"description\" content=\"Custom engineered solar thermal products guide for EPC projects: OEM\/ODM collectors, drawings, test data, compliance, lifecycle and RFQ inputs.\">\n<link rel=\"canonical\" href=\"https:\/\/service.soletksolar.com\/custom-engineered-solar-thermal-products\/\">\n<meta property=\"og:title\" content=\"Custom Engineered Solar Thermal Products for EPC Projects\"><br \/>\n<meta property=\"og:description\" content=\"A custom solar thermal engineering guide for EPC projects, OEM\/ODM collectors, drawings, test data, compliance mapping, lifecycle, and RFQ inputs.\"><br \/>\n<meta property=\"og:type\" content=\"article\"><br \/>\n<meta property=\"og:url\" content=\"https:\/\/service.soletksolar.com\/custom-engineered-solar-thermal-products\/\"><br \/>\n<meta property=\"og:image\" 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.block{padding:23px 20px;margin:28px 0}\n .workflow-strip,.calc-steps,.family-grid,.image-grid,.doc-grid,.rfq-grid{grid-template-columns:1fr}\n .cta{padding:26px 20px}\n }\n<\/style>\n<p><\/head><body><\/p>\n<section class=\"engineering-hero\">\n<div class=\"hero-inner\">\n<div class=\"crumbs\">\n <a href=\"https:\/\/service.soletksolar.com\/\">Home<\/a><br \/>\n <span>\/<\/span><br \/>\n <a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector-products\/\">Solar Collector Products<\/a><br \/>\n <span>\/<\/span><br \/>\n <span>Custom Engineering<\/span>\n <\/div>\n<p> <span class=\"kicker\">OEM \/ ODM \/ EPC product engineering<\/span><\/p>\n<h1>Custom Engineered Solar Thermal Products for EPC Projects<\/h1>\n<p class=\"lead\">Define custom solar thermal products by measurable project constraints: thermal target, interface dimensions, standards, drawings, sample approval, inspection records, packaging, and lifecycle support.<\/p>\n<div class=\"workflow-strip\">\n<div><b>3-5 days<\/b><span>requirement freeze after complete RFQ<\/span><\/div>\n<div><b>5-10 days<\/b><span>simple engineering drawing planning interval<\/span><\/div>\n<div><b>2-4 weeks<\/b><span>sample or pilot unit when physical proof is needed<\/span><\/div>\n<div><b>20 modules<\/b><span>worked example custom RFQ starting point<\/span><\/div>\n<div><b>30 days<\/b><span>installation feedback window after arrival<\/span><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n<nav class=\"nav-strip\" aria-label=\"Article sections\">\n<div class=\"nav-inner\">\n <a href=\"#answer\">Custom Answer<\/a><br \/>\n <a href=\"#scope\">Scope Calculation<\/a><br \/>\n <a href=\"#families\">Product Families<\/a><br \/>\n <a href=\"#documents\">Documents<\/a><br \/>\n <a href=\"#prototype\">Prototype<\/a><br \/>\n <a href=\"#standards\">Standards<\/a><br \/>\n <a href=\"#risks\">Risks<\/a><br \/>\n <a href=\"#rfq\">RFQ<\/a><br \/>\n <a href=\"#checklist\">Checklist<\/a><br \/>\n <a href=\"#faq\">FAQ<\/a>\n <\/div>\n<\/nav>\n<p><main class=\"content\"><\/p>\n<article>\n<div class=\"intro\">\n<div>\n<p>By <strong>SOLETKS Engineering Team<\/strong>, the solar thermal product engineering group that supports collector selection, documentation, and project quotation for B2B solar thermal applications.<\/p>\n<p><strong>Custom engineered solar thermal products<\/strong> are useful when a distributor, EPC contractor, or project owner needs a collector, mounting package, tank interface, air-heating unit, control package, or OEM\/ODM configuration that standard catalog pages do not fully cover.<\/p>\n<p>The right custom scope starts with load data, installation constraints, destination standards, drawings, sample plan, quality records, packaging, and after-sales documents. Use SOLETKS’ <a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector-products\/\">Solar Collector Products<\/a> page to compare product families, and use the <a href=\"https:\/\/service.soletksolar.com\/products\/commercial-industrial-solar-hot-water-system\/\">Commercial \/ Industrial Solar Hot Water System<\/a> page when the custom product belongs to a larger hot-water plant.<\/p>\n<\/p><\/div>\n<figure class=\"factory-img\">\n <img decoding=\"async\" src=\"https:\/\/service.soletksolar.com\/wp-content\/uploads\/2025\/11\/494685619_1404751250597164_7706161979368977777_n.jpg\" alt=\"SOLETKS clean energy manufacturing facility for custom engineered solar thermal products\"><figcaption>Custom engineering should connect factory capability with the actual EPC constraint, not add changes for their own sake.<\/figcaption><\/figure>\n<\/p><\/div>\n<section id=\"answer\" class=\"block tint\">\n <span class=\"label\">Custom Engineering Answer<\/span><\/p>\n<h2>Change Only What the Project Requires<\/h2>\n<div class=\"answer\"><strong>Use a standard product<\/strong> when only quantity, destination, or label changes. Use a custom engineered scope when the EPC design has a measurable constraint such as roof row spacing, duct connection size, tank room height, freeze temperature, working pressure, or control-panel standard.<\/div>\n<p>The useful custom question is precise: which requirement cannot be solved by the standard product? Common answers include mounting geometry, manifold direction, absorber coating, airflow connection, tank interface, packaging size, documentation language, project branding, control cabinet scope, or compliance documents.<\/p>\n<p>A vague custom request raises cost and slows engineering because every change must be drawn, sampled, tested, packed, and documented.<\/p>\n<\/section>\n<section id=\"scope\" class=\"block\">\n <span class=\"label\">Thermal Scope First<\/span><\/p>\n<h2>Custom Scope Calculation<\/h2>\n<p>An EPC quote should calculate the thermal scope before asking for a custom drawing. This worked example uses a screening collector-area method; final design should use project weather data, product test data, and system loss assumptions.<\/p>\n<div class=\"calc-board\">\n<div class=\"calc-input\">\n<h3>Example input<\/h3>\n<ul>\n<li>Process preheat target: <strong>120 kWh\/day<\/strong><\/li>\n<li>Useful solar yield: <strong>3.5 kWh\/m2\/day<\/strong><\/li>\n<li>Candidate module area: <strong>2.0 m2<\/strong><\/li>\n<li>Design spare allowance: <strong>10%<\/strong><\/li>\n<\/ul><\/div>\n<div class=\"calc-steps\">\n<div class=\"calc-step\"><span>1<\/span><\/p>\n<h4>Collector area<\/h4>\n<p><code>120 \/ 3.5<\/code><b>34.3 m2<\/b><\/div>\n<div class=\"calc-step\"><span>2<\/span><\/p>\n<h4>Base module count<\/h4>\n<p><code>34.3 \/ 2.0<\/code><b>17.2 modules<\/b><\/div>\n<div class=\"calc-step\"><span>3<\/span><\/p>\n<h4>Round up<\/h4>\n<p><code>ceil(17.2)<\/code><b>18 modules<\/b><\/div>\n<div class=\"calc-step\"><span>4<\/span><\/p>\n<h4>Spare-adjusted<\/h4>\n<p><code>18 x 1.10<\/code><b>19.8 modules<\/b><\/div>\n<div class=\"calc-result\"><strong>Recommendation:<\/strong> start the custom RFQ at <strong>20 modules<\/strong> and ask SOLETKS whether a standard module, modified manifold, or custom frame gives the best fit. If the EPC layout has only <strong>32 m2<\/strong> usable roof area, solve the area constraint before changing absorber or frame design.<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n<section id=\"families\" class=\"block\">\n <span class=\"label\">Product Family Boundary<\/span><\/p>\n<h2>Customization Boundaries by Product Family<\/h2>\n<p>Custom work should be matched to the product family because air collectors, water collectors, and hybrid systems have different risk points. Mechanism matters: a small manifold change alters pressure drop, while a duct-flange change alters air velocity and fan power.<\/p>\n<div class=\"family-grid\">\n<div class=\"family-card\">\n<h3><a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector\/flat-plate-solar-collector\/\">Flat plate water collector<\/a><\/h3>\n<p>Frame color, manifold direction, mounting kit, packaging. Control pressure rating and test evidence.<\/p>\n<\/div>\n<div class=\"family-card\">\n<h3><a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector-products\/\">Large flat plate collector<\/a><\/h3>\n<p>Project frame, row connection, transport method. Control roof load and handling path.<\/p>\n<\/div>\n<div class=\"family-card\">\n<h3><a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector\/afpc-solar-air-collector\/\">Air collector<\/a><\/h3>\n<p>Duct flange, airflow direction, insulation, filter access. Control pressure drop and leakage.<\/p>\n<\/div>\n<div class=\"family-card\">\n<h3><a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector\/atpc-hot-air-collector\/\">Hot-air collector<\/a><\/h3>\n<p>High-temperature ducting, bypass damper, backup interlock. Control overheating and logic.<\/p>\n<\/div>\n<div class=\"family-card\">\n<h3><a href=\"https:\/\/service.soletksolar.com\/products\/commercial-industrial-solar-hot-water-system\/\">Commercial package<\/a><\/h3>\n<p>Tank interface, heat exchanger, pump station, controls. Control hydraulic balance and backup priority.<\/p>\n<\/div><\/div>\n<div class=\"image-grid\">\n<figure class=\"image-card\">\n <img decoding=\"async\" src=\"https:\/\/service.soletksolar.com\/wp-content\/uploads\/2025\/11\/flat-plate-solar-collector.jpg\" alt=\"Flat plate solar collector for custom engineered solar thermal product planning\"><figcaption><a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector\/flat-plate-solar-collector\/\">Flat plate water-collector<\/a> custom work should preserve pressure rating, test basis, and installation interface.<\/figcaption><\/figure>\n<figure class=\"image-card\">\n <img decoding=\"async\" src=\"https:\/\/service.soletksolar.com\/wp-content\/uploads\/2025\/11\/Air-solar-collector.jpg\" alt=\"Solar air collector for custom duct and airflow engineering scope\"><figcaption><a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector\/afpc-solar-air-collector\/\">Air collector<\/a> customization needs airflow, duct flange, filter access, and leakage control.<\/figcaption><\/figure>\n<figure class=\"image-card\">\n <img decoding=\"async\" src=\"https:\/\/service.soletksolar.com\/wp-content\/uploads\/2025\/11\/PVT.jpg\" alt=\"PVT solar thermal product image for custom hybrid solar applications\"><figcaption><a href=\"https:\/\/service.soletksolar.com\/products\/pvt-hybrid-solar-systems\/\">PVT hybrid products<\/a> need clearer boundaries because electrical, thermal, mounting, and controls can overlap.<\/figcaption><\/figure>\n<\/p><\/div>\n<\/section>\n<section id=\"documents\" class=\"block dark\">\n <span class=\"label\">Document Package<\/span><\/p>\n<h2>Engineering Document Package<\/h2>\n<p>A custom product should have a document package before production approval. <a href=\"https:\/\/service.soletksolar.com\/company\/quality-assurance\/\">SOLETKS quality assurance materials<\/a> describe procurement, design, manufacturing, integration, testing, delivery, and export packaging processes.<\/p>\n<div class=\"doc-grid\">\n<div>Product datasheet with model, size, weight, pressure, temperature range.<\/div>\n<div>General arrangement drawing with dimensions in mm.<\/div>\n<div>Mounting or connection drawing.<\/div>\n<div>Hydraulic or airflow interface drawing.<\/div>\n<div>Electrical drawing when a control panel is included.<\/div>\n<div>Certificate copies tied to the exact supplied scope.<\/div>\n<div>Packing list and container loading direction.<\/div>\n<div>Installation, maintenance, commissioning, or factory inspection record.<\/div>\n<\/p><\/div>\n<p style=\"margin-top:18px;\">The document package prevents the most common custom-project failure: the buyer approves a price while the installer, warehouse, and commissioning team each assume a different interface.<\/p>\n<\/section>\n<section id=\"prototype\" class=\"block\">\n <span class=\"label\">Controlled Stages<\/span><\/p>\n<h2>Prototype, Production, and Lifecycle Matrix<\/h2>\n<p>Custom engineering should move through controlled stages because every design change has a cost, schedule, and maintenance effect. The final lead time depends on model, tooling, test scope, order volume, and shipping method.<\/p>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>Stage<\/th>\n<th>Typical planning interval<\/th>\n<th>Output record<\/th>\n<th>Lifecycle effect<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Requirement freeze<\/td>\n<td>3-5 working days after complete RFQ<\/td>\n<td>Load, drawing, standard, packaging scope<\/td>\n<td>Prevents late rework<\/td>\n<\/tr>\n<tr>\n<td>Engineering drawing<\/td>\n<td>5-10 working days for simple changes<\/td>\n<td>GA drawing and interface drawing<\/td>\n<td>Locks dimensions before sampling<\/td>\n<\/tr>\n<tr>\n<td>Sample or pilot unit<\/td>\n<td>2-4 weeks when physical sample is required<\/td>\n<td>Sample inspection and photo record<\/td>\n<td>Reduces first-batch installation risk<\/td>\n<\/tr>\n<tr>\n<td>Factory inspection<\/td>\n<td>Before shipment; 1 record per batch<\/td>\n<td>Visual, dimension, packing, label record<\/td>\n<td>Creates baseline for warranty discussion<\/td>\n<\/tr>\n<tr>\n<td>Installation feedback<\/td>\n<td>Within 30 days after arrival<\/td>\n<td>Site photos and issue log<\/td>\n<td>Improves next batch or project phase<\/td>\n<\/tr>\n<tr>\n<td>Lifecycle review<\/td>\n<td>12 months after commissioning for repeat projects<\/td>\n<td>Maintenance and failure notes<\/td>\n<td>Guides design life and TCO decisions<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<div class=\"note\">SOLETKS’ Saga County centralized solar heating project is published as a 107,000 m2 heating-coverage reference with 2,424 tons\/year coal reduction, showing that EPC discussions should include scale, thermal target, and long-term operation evidence.<\/div>\n<\/section>\n<section id=\"standards\" class=\"block\">\n <span class=\"label\">Compliance Map<\/span><\/p>\n<h2>Standards and Compliance Mapping<\/h2>\n<p>Compliance mapping should be done before custom production because changing a material, control panel, or pressure boundary affects documents. Request model-specific documents; management-system certificates do not replace product test reports.<\/p>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>Standard or certificate<\/th>\n<th>Custom-product relevance<\/th>\n<th>RFQ rule<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>ISO 9806:2017<\/td>\n<td>Solar thermal collector performance<\/td>\n<td>Use for collector test-data basis.<\/td>\n<\/tr>\n<tr>\n<td>ISO 9001<\/td>\n<td>Supplier quality management<\/td>\n<td>Use for factory-process qualification.<\/td>\n<\/tr>\n<tr>\n<td>ISO 14001<\/td>\n<td>Environmental management<\/td>\n<td>Use where procurement scores factory systems.<\/td>\n<\/tr>\n<tr>\n<td>ISO 45001<\/td>\n<td>Occupational health and safety management<\/td>\n<td>Use for supplier-system qualification.<\/td>\n<\/tr>\n<tr>\n<td>CE<\/td>\n<td>EU conformity route<\/td>\n<td>Use when the destination and scope require it.<\/td>\n<\/tr>\n<tr>\n<td>UL 508A<\/td>\n<td>Industrial control panel<\/td>\n<td>Use when the supplied panel falls into UL panel scope.<\/td>\n<\/tr>\n<tr>\n<td>ASME BPVC<\/td>\n<td>Pressure vessels or governed pressure parts<\/td>\n<td>Use for tanks, vessels, or heat exchangers under pressure rules.<\/td>\n<\/tr>\n<tr>\n<td>EN 12975<\/td>\n<td>Legacy European collector context<\/td>\n<td>Use only when the buyer requests legacy test references.<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n<section id=\"risks\" class=\"block tint\">\n <span class=\"label\">Procurement Control<\/span><\/p>\n<h2>Procurement Risks and Controls<\/h2>\n<p>Custom products need tighter procurement control because a small interface error becomes expensive after shipment. These controls reduce risk because the buyer, SOLETKS, freight forwarder, and installer all work from the same record.<\/p>\n<ul>\n<li>Freeze the drawing revision and write the revision code on the proforma invoice.<\/li>\n<li>Put model, quantity, color, dimensions, port direction, and packaging into the purchase document.<\/li>\n<li>Request a sample photo set or inspection photo set for custom visible parts.<\/li>\n<li>Require packing protection for glass, absorber plates, frame corners, and control components.<\/li>\n<li>Put destination standards and document language into the RFQ.<\/li>\n<li>Define whether the order is OEM, ODM, private label, or project-specific supply.<\/li>\n<li>State whether spare tubes, seals, sensors, or controllers ship with the first batch.<\/li>\n<\/ul>\n<div class=\"image-grid\">\n<figure class=\"image-card\">\n <img decoding=\"async\" src=\"https:\/\/service.soletksolar.com\/wp-content\/uploads\/2025\/11\/1743662438978.jpeg\" alt=\"SOLETKS manufacturing and quality workflow image for custom product procurement control\"><figcaption>Visible custom details should be inspected before shipment so the first batch does not become the first real test.<\/figcaption><\/figure>\n<figure class=\"image-card\">\n <img decoding=\"async\" src=\"https:\/\/service.soletksolar.com\/wp-content\/uploads\/2025\/11\/1743662599508.jpeg\" alt=\"SOLETKS production facility image for custom engineered solar thermal products\"><figcaption>Factory inspection records create a baseline for warranty, packaging, and repeat EPC batch decisions.<\/figcaption><\/figure>\n<figure class=\"image-card\">\n <img decoding=\"async\" src=\"https:\/\/service.soletksolar.com\/wp-content\/uploads\/2025\/11\/494685619_1404751250597164_7706161979368977777_n.jpg\" alt=\"SOLETKS clean energy manufacturing facility for custom engineered solar thermal products\"><figcaption>Custom engineering should connect product family, drawing revision, standard, packaging, and after-sales support.<\/figcaption><\/figure>\n<\/p><\/div>\n<\/section>\n<section id=\"rfq\" class=\"block dark\">\n <span class=\"label\">RFQ Input Set<\/span><\/p>\n<h2>RFQ Inputs for SOLETKS<\/h2>\n<p>A custom engineered solar thermal RFQ should include load, interface, compliance, and delivery data. Send project data through the <a href=\"https:\/\/service.soletksolar.com\/contact\/\">SOLETKS contact page<\/a> and ask for engineering support before changing the standard product.<\/p>\n<div class=\"rfq-grid\">\n<div>Product family: <a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector\/flat-plate-solar-collector\/\">flat plate<\/a>, <a href=\"https:\/\/service.soletksolar.com\/products\/evacuated-tube-solar-collector\/\">evacuated tube<\/a>, <a href=\"https:\/\/service.soletksolar.com\/products\/solar-water-heater\/heat-pipe-solar-water-heater\/\">heat pipe<\/a>, <a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector\/afpc-solar-air-collector\/\">air collector<\/a>, <a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector\/atpc-hot-air-collector\/\">hot-air collector<\/a>, <a href=\"https:\/\/service.soletksolar.com\/products\/pvt-hybrid-solar-systems\/\">PVT<\/a>, tank, or <a href=\"https:\/\/service.soletksolar.com\/products\/commercial-industrial-solar-hot-water-system\/\">system package<\/a>.<\/div>\n<div>Project use: domestic hot water, hotel, school, factory preheat, drying, ventilation, or district heating support.<\/div>\n<div>Daily thermal target in kWh\/day or water volume in L\/day.<\/div>\n<div>Target temperature and cold-water or inlet-air temperature.<\/div>\n<div>Required dimensions, mounting angle, port direction, duct size, or tank interface.<\/div>\n<div>Destination country, required standards, and document language.<\/div>\n<div>Quantity for sample, pilot batch, and full project batch.<\/div>\n<div>Branding requirement: neutral, SOLETKS, OEM, or ODM.<\/div>\n<div>Packaging requirement, container target, destination port, and trade term.<\/div>\n<div>Required documents: drawings, datasheet, certificate, packing list, inspection record, installation guide.<\/div>\n<\/p><\/div>\n<\/section>\n<section id=\"checklist\" class=\"block\">\n <span class=\"label\">Custom Boundary<\/span><\/p>\n<h2>Specification Checklist<\/h2>\n<p>The specification checklist should define the custom boundary so engineering and procurement do not drift apart. Attach this checklist to the RFQ and purchase order.<\/p>\n<div class=\"table-wrap\">\n<table>\n<thead>\n<tr>\n<th>Item<\/th>\n<th>Minimum specification<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Custom reason<\/td>\n<td>The measurable constraint that standard product cannot solve<\/td>\n<\/tr>\n<tr>\n<td>Product scope<\/td>\n<td>Collector, tank, mounting, controls, packaging, or full system<\/td>\n<\/tr>\n<tr>\n<td>Thermal target<\/td>\n<td>kWh\/day, L\/day, temperature rise, or airflow\/temperature target<\/td>\n<\/tr>\n<tr>\n<td>Interface<\/td>\n<td>Port direction, duct size, mounting hole, tank connection, wiring<\/td>\n<\/tr>\n<tr>\n<td>Compliance<\/td>\n<td>ISO 9806:2017, ISO 9001, CE, UL 508A, ASME BPVC, EN 12975 if required<\/td>\n<\/tr>\n<tr>\n<td>Sample plan<\/td>\n<td>Drawing approval, sample quantity, inspection record, approval owner<\/td>\n<\/tr>\n<tr>\n<td>Production plan<\/td>\n<td>Batch quantity, lead time, packing method, spare parts<\/td>\n<\/tr>\n<tr>\n<td>Handover<\/td>\n<td>Datasheet, drawings, installation guide, commissioning form<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n<section id=\"faq\" class=\"block tint\">\n <span class=\"label\">FAQ<\/span><\/p>\n<h2>Frequently Asked Questions<\/h2>\n<div class=\"faq-list\">\n<details>\n<summary>Is a custom engineered solar thermal product worth the added work?<\/summary>\n<div class=\"faq-body\">A custom engineered solar thermal product is worth the added work when a measurable project constraint blocks a standard model. Good reasons include port direction, mounting geometry, duct connection, pressure boundary, documentation language, packaging, or control-panel standard.<\/div>\n<\/details>\n<details>\n<summary>Does OEM or ODM change the engineering process?<\/summary>\n<div class=\"faq-body\">OEM or ODM changes the documentation and approval process because branding, label, packaging, drawing revision, and inspection records must match the buyer’s sales channel. The thermal design still needs load data, interface dimensions, standards, and test evidence.<\/div>\n<\/details>\n<details>\n<summary>What information speeds up a custom quote?<\/summary>\n<div class=\"faq-body\">A custom quote moves faster when the buyer sends thermal target, drawing, interface dimension, destination standard, quantity, branding need, packaging requirement, and delivery term in the first RFQ. Missing drawings create rework because engineering must guess dimensions.<\/div>\n<\/details>\n<details>\n<summary>Which standards matter most for custom solar thermal products?<\/summary>\n<div class=\"faq-body\">The most important standards depend on scope: ISO 9806:2017 for collector performance, ISO 9001 for supplier quality management, CE for EU conformity routes, UL 508A for applicable control panels, and ASME BPVC for governed pressure equipment.<\/div>\n<\/details><\/div>\n<\/section>\n<div class=\"sources\">\n<h2>Sources<\/h2>\n<ol>\n<li>SOLETKS solar collector products and commercial system pages: <a href=\"https:\/\/service.soletksolar.com\/products\/solar-collector-products\/\">Solar Collector Products<\/a> and <a href=\"https:\/\/service.soletksolar.com\/products\/commercial-industrial-solar-hot-water-system\/\">Commercial \/ Industrial Solar Hot Water System<\/a>.<\/li>\n<li>Collector-area calculation is a screening method; final design should use local weather, selected model data, and project losses.<\/li>\n<li>SOLETKS <a href=\"https:\/\/service.soletksolar.com\/company\/quality-assurance\/\">quality assurance<\/a> and <a href=\"https:\/\/service.soletksolar.com\/contact\/\">contact<\/a> pages.<\/li>\n<li>Custom timing ranges are planning values and should be confirmed in the final quotation.<\/li>\n<li>SOLETKS published Saga County centralized solar heating reference: 107,000 m2 heating coverage and 2,424 tons\/year coal reduction.<\/li>\n<\/ol><\/div>\n<section class=\"cta\">\n<h2>Freeze the custom boundary before sampling<\/h2>\n<p>Send SOLETKS the product family, thermal target, drawings, interface dimensions, destination standards, quantity plan, branding requirement, packaging rules, and handover documents so the custom scope can move from RFQ to drawing to sample without drift.<\/p>\n<div class=\"btns\">\n <a class=\"btn primary\" href=\"https:\/\/service.soletksolar.com\/contact\/\">Start Custom RFQ<\/a><br \/>\n <a class=\"btn secondary\" href=\"https:\/\/service.soletksolar.com\/products\/solar-collector-products\/\">Browse Product Families<\/a>\n <\/div>\n<\/section>\n<\/article>\n<p><\/main><\/p>\n<p><script type=\"application\/ld+json\">\n{\n \"@context\": \"https:\/\/schema.org\",\n \"@graph\": [\n {\n \"@type\": \"Article\",\n \"@id\": \"https:\/\/service.soletksolar.com\/custom-engineered-solar-thermal-products\/#article\",\n \"headline\": \"Custom Engineered Solar Thermal Products for EPC Projects\",\n \"description\": \"Custom engineered solar thermal products guide for EPC projects: OEM\/ODM collectors, drawings, test data, compliance, lifecycle and RFQ inputs.\",\n \"author\": {\n \"@type\": \"Organization\",\n \"name\": \"SOLETKS Engineering Team\"\n },\n \"publisher\": {\n \"@id\": \"https:\/\/service.soletksolar.com\/#organization\"\n },\n \"datePublished\": \"2026-06-29\",\n \"dateModified\": \"2026-06-29\",\n \"mainEntityOfPage\": \"https:\/\/service.soletksolar.com\/custom-engineered-solar-thermal-products\/\",\n \"image\": \"https:\/\/service.soletksolar.com\/wp-content\/uploads\/2025\/11\/494685619_1404751250597164_7706161979368977777_n.jpg\"\n },\n {\n \"@type\": \"FAQPage\",\n \"@id\": \"https:\/\/service.soletksolar.com\/custom-engineered-solar-thermal-products\/#faq\",\n \"mainEntity\": [\n {\n \"@type\": \"Question\",\n \"name\": \"Is a custom engineered solar thermal product worth the added work?\",\n \"acceptedAnswer\": {\n \"@type\": \"Answer\",\n \"text\": \"A custom engineered solar thermal product is worth the added work when a measurable project constraint blocks a standard model. 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