Question 1

Dual-Energy Output: Electricity + Heat

Accepted Answer

The integrated design captures solar radiation for electricity while extracting residual thermal energy from the PV surface.

Question 2

Vacuum-Bonded Heat Transfer Layer

Accepted Answer

A vacuum laminated interface minimizes thermal resistance between the PV cell and absorber, increasing heat transfer efficiency by 40%+ vs. conventional PVT structures.

Question 3

Three-Layer Thermal Insulation System

Accepted Answer

Front and back insulation reduces thermal losses and improves stability:

Question 4

Smart Energy Monitoring & BEMS Ready

Accepted Answer

Built-in temperature sensors + intelligent controller enable:

Question 5

High-Efficiency N-Type TOPCon PV Cells

Accepted Answer

High conversion efficiency and low light performance. Multi-busbar design for stable output.

Question 6

Uniform Heat Transfer Architecture

Accepted Answer

High-purity aluminum conduction plate. Optimized flow path design ensures ±1°C surface temperature uniformity.

Question 7

Low-Loss Front Cover System

Accepted Answer

Tempered high-transmittance glass. Reduced convection and reflection losses.

Question 8

Rugged, Long-Life Structure

Accepted Answer

Anodized 6063-T5 aluminum frame (tensile strength 180 MPa). UV-resistant sealing, IP65 waterproof, engineered for long-term outdoor operation.

Question 9

Centralized Solar Heating for Saga County Town in Shigatse City
                    
                        2019
                        Shigatse, Tibet
                        107,000 m²
                    
                    EFPC115 large flat-plate collectors provide heating coverage for 107,000 m², replacing traditional coal and yak dung heating. Reduces coal consumption by 2,424 tons annually.
                    
                        World's first high-altitude solar centralized heating
                        First full-chain turnkey solar heating project
                        Tibet's first large-scale solar heating

Get Quote

View Details

Tianjin School TPV Pro+ Heat Pump Project
                        
                            2024
                            Tianjin
                            3,000 m²
                        
                        TPV Pro+ heat pump system meets students' heating needs while generating on-site electricity.

Get Quote

View Details

APEC Summit Hotel Hot Water System
                        
                            2014
                            Beijing
                            50 tons/day
                        
                        Supplies hot water for APEC Summit hotel. Saves 150,000 kWh annually, reduces CO2 by 74 tons.

Get Quote

View Details

Florida Resort Villa Hot Water Project
                        
                            2022
                            Florida, USA
                            200L/day
                        
                        Flat-plate water heaters provide 200L daily hot water for each resort villa.

Get Quote

View Details

Harz Church Hot Water Project
                        
                            2021
                            Germany
                            22 tons/day
                        
                        Engineering-grade collectors in series/parallel configuration provide reliable hot water supply.

Get Quote

View Details

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.projects-showcase {
    padding: 70px 0;
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
}

.container {
    max-width: 1480px;
    margin: 0 auto;
    padding: 0 40px;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 50px;
}

.section-label {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: #3b82f6;
    margin-bottom: 12px;
}

.section-title {
    font-size: 44px;
    font-weight: 800;
    color: #1e293b;
    margin-bottom: 16px;
    line-height: 1.2;
}

.title-highlight {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-description {
    font-size: 17px;
    line-height: 1.6;
    color: #64748b;
}

.projects-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    align-items: stretch;
}

/* Featured Project */
.project-featured {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
}

.project-featured::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #3b82f6, #1d4ed8);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.project-featured:hover {
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    transform: translateY(-5px);
}

.project-featured:hover::before {
    opacity: 1;
}

.featured-image {
    position: relative;
    height: 300px;
    overflow: hidden;
    flex-shrink: 0;
}

.featured-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.project-featured:hover .featured-image img {
    transform: scale(1.06);
}

.featured-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
    padding: 6px 16px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 20px;
}

.featured-content {
    padding: 28px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.featured-content h3 {
    font-size: 24px;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 16px;
    line-height: 1.3;
}

.meta-tags {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid #e8e8e8;
}

.meta-tags span {
    font-size: 12px;
    font-weight: 600;
    color: #64748b;
    padding: 4px 12px;
    background: linear-gradient(135deg, #e0f2fe, #bae6fd);
    border-radius: 12px;
    border: 1px solid #7dd3fc;
}

.featured-content p {
    font-size: 15px;
    line-height: 1.7;
    color: #64748b;
    margin-bottom: 20px;
}

.achievements-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 24px;
}

.achievement {
    font-size: 13px;
    color: #1e293b;
    padding: 10px 14px;
    background: linear-gradient(135deg, #e0f2fe, #bae6fd);
    border-left: 3px solid #3b82f6;
    border-radius: 4px;
    font-weight: 500;
    line-height: 1.5;
}

.featured-actions {
    display: flex;
    gap: 10px;
    margin-top: auto;
}

.btn-primary, .btn-secondary {
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1;
    justify-content: center;
}

.btn-primary svg {
    width: 16px;
    height: 16px;
    transition: transform 0.3s ease;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover svg {
    transform: translateX(2px);
}

.btn-secondary {
    background: transparent;
    color: #64748b;
    padding: 10px 16px;
    border: 1px solid #cbd5e1;
}

.btn-secondary:hover {
    background: #f8fafc;
    color: #475569;
    border-color: #94a3b8;
}

/* Small Button Variant for Cards */
.btn-small {
    font-size: 0.75rem;
    padding: 8px 12px;
}

.btn-small svg {
    width: 14px;
    height: 14px;
}

/* Right Side Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 24px;
    height: 100%;
}

.project-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #3b82f6, #1d4ed8);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.project-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    transform: translateY(-4px);
}

.project-card:hover::before {
    opacity: 1;
}

.card-image {
    height: 160px;
    overflow: hidden;
    flex-shrink: 0;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.project-card:hover .card-image img {
    transform: scale(1.08);
}

.card-content {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.card-content h4 {
    font-size: 17px;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 12px;
    line-height: 1.4;
}

.card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.card-meta span {
    font-size: 11px;
    font-weight: 600;
    color: #64748b;
    padding: 3px 10px;
    background: linear-gradient(135deg, #e0f2fe, #bae6fd);
    border-radius: 10px;
    border: 1px solid #7dd3fc;
}

.card-content p {
    font-size: 14px;
    line-height: 1.6;
    color: #64748b;
    margin-bottom: 16px;
    flex: 1;
}

/* Card Actions */
.card-actions {
    display: flex;
    gap: 8px;
    margin-top: auto;
}

.card-actions .btn-primary,
.card-actions .btn-secondary {
    flex: 1;
}

@media (max-width: 1200px) {
    .container {
        padding: 0 30px;
    }
    
    .section-title {
        font-size: 38px;
    }
    
    .projects-layout {
        gap: 28px;
    }
    
    .featured-image {
        height: 260px;
    }
    
    .card-image {
        height: 140px;
    }
}

@media (max-width: 1024px) {
    .projects-layout {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: auto;
        gap: 20px;
    }
    
    .featured-image {
        height: 300px;
    }
    
    .card-image {
        height: 180px;
    }
}

@media (max-width: 768px) {
    .projects-showcase {
        padding: 60px 0;
    }
    
    .container {
        padding: 0 20px;
    }
    
    .section-header {
        margin-bottom: 40px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .section-description {
        font-size: 16px;
    }
    
    .featured-image {
        height: 240px;
    }
    
    .featured-content {
        padding: 24px;
    }
    
    .featured-content h3 {
        font-size: 21px;
    }
    
    .card-content h4 {
        font-size: 16px;
    }
    
    .featured-actions {
        flex-direction: column;
    }
    
    .btn-primary, .btn-secondary {
        width: 100%;
        justify-content: center;
    }
    
    .card-actions {
        flex-direction: column;
    }
}

@media (max-width: 640px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .card-image {
        height: 200px;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: 28px;
    }
    
    .featured-image {
        height: 220px;
    }
    
    .featured-content h3 {
        font-size: 19px;
    }
}

.certifications-section {
      width: 100%;
      background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      padding: 80px 0;
      position: relative;
      overflow: hidden;
    }

.certifications-section::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 1px;
      background: linear-gradient(90deg, transparent, #e2e8f0 50%, transparent);
    }

.certifications-container {
      max-width: 1400px;
      margin: 0 auto;
      padding: 0 40px;
    }

/* Section Header */
    .certifications-header {
      text-align: center;
      margin-bottom: 60px;
    }

.certifications-label {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 2px;
      color: #3b82f6;
      margin-bottom: 15px;
      padding: 8px 20px;
      background: rgba(59, 130, 246, 0.1);
      border-radius: 25px;
      border: 1px solid rgba(59, 130, 246, 0.2);
    }

.certifications-title {
      font-size: 44px;
      font-weight: 800;
      color: #1e293b;
      margin: 0 0 20px 0;
      line-height: 1.2;
    }

.certifications-title .highlight {
      background: linear-gradient(135deg, #3b82f6, #2563eb);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

.certifications-description {
      font-size: 17px;
      line-height: 1.7;
      color: #64748b;
      max-width: 900px;
      margin: 0 auto;
    }

/* Tabs Navigation */
    .cert-tabs {
      display: flex;
      justify-content: center;
      gap: 12px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

.cert-tab {
      padding: 12px 28px;
      font-size: 15px;
      font-weight: 600;
      color: #64748b;
      background: white;
      border: 2px solid #e2e8f0;
      border-radius: 50px;
      cursor: pointer;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

.cert-tab::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.1), transparent);
      transition: left 0.5s ease;
    }

.cert-tab:hover {
      border-color: #3b82f6;
      color: #3b82f6;
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
    }

.cert-tab:hover::before {
      left: 100%;
    }

.cert-tab.active {
      background: linear-gradient(135deg, #3b82f6, #2563eb);
      color: white;
      border-color: #3b82f6;
      box-shadow: 0 4px 16px rgba(59, 130, 246, 0.4);
    }

/* Tab Content */
    .cert-tab-content {
      display: none;
      animation: fadeIn 0.5s ease;
    }

.cert-tab-content.active {
      display: block;
    }

@keyframes fadeIn {
      from {
        opacity: 0;
        transform: translateY(20px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

/* Certificates Grid - 4 columns */
    .certificates-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 25px;
      margin-bottom: 40px;
    }

.certificate-card {
      background: white;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
      transition: all 0.4s ease;
      cursor: pointer;
      position: relative;
    }

.certificate-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: linear-gradient(90deg, #3b82f6, #2563eb);
      transform: scaleX(0);
      transition: transform 0.4s ease;
    }

.certificate-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 12px 40px rgba(59, 130, 246, 0.2);
    }

.certificate-card:hover::before {
      transform: scaleX(1);
    }

.certificate-image {
      width: 100%;
      height: 280px;
      overflow: hidden;
      background: #f1f5f9;
      position: relative;
    }

.certificate-image img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      padding: 15px;
      transition: transform 0.5s ease;
    }

.certificate-card:hover .certificate-image img {
      transform: scale(1.08);
    }

.certificate-badge {
      position: absolute;
      top: 12px;
      right: 12px;
      background: linear-gradient(135deg, #3b82f6, #2563eb);
      color: white;
      padding: 5px 12px;
      border-radius: 20px;
      font-size: 10px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
    }

.certificate-info {
      padding: 20px;
    }

.certificate-name {
      font-size: 16px;
      font-weight: 700;
      color: #1e293b;
      margin: 0 0 6px 0;
      line-height: 1.4;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }

.certificate-type {
      font-size: 13px;
      color: #64748b;
      margin: 0;
    }

/* Lightbox Modal */
    .lightbox-modal {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.95);
      z-index: 10000;
      justify-content: center;
      align-items: center;
      padding: 40px;
      animation: lightboxFadeIn 0.3s ease;
    }

.lightbox-modal.active {
      display: flex;
    }

@keyframes lightboxFadeIn {
      from {
        opacity: 0;
      }
      to {
        opacity: 1;
      }
    }

.lightbox-content {
      position: relative;
      max-width: 95%;
      max-height: 95%;
      display: flex;
      justify-content: center;
      align-items: center;
      animation: zoomIn 0.4s ease;
    }

@keyframes zoomIn {
      from {
        transform: scale(0.8);
        opacity: 0;
      }
      to {
        transform: scale(1);
        opacity: 1;
      }
    }

.lightbox-content img {
      max-width: 100%;
      max-height: 90vh;
      width: auto;
      height: auto;
      object-fit: contain;
      border-radius: 8px;
      box-shadow: 0 20px 80px rgba(0, 0, 0, 0.5);
    }

.lightbox-close {
      position: fixed;
      top: 30px;
      right: 30px;
      width: 50px;
      height: 50px;
      background: rgba(255, 255, 255, 0.95);
      border: none;
      border-radius: 50%;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.3s ease;
      z-index: 10001;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    }

.lightbox-close:hover {
      background: white;
      transform: rotate(90deg) scale(1.1);
    }

.lightbox-close svg {
      width: 24px;
      height: 24px;
      stroke: #1e293b;
      stroke-width: 2.5;
    }

.lightbox-info {
      position: fixed;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      background: rgba(255, 255, 255, 0.95);
      padding: 12px 24px;
      border-radius: 30px;
      font-size: 14px;
      color: #1e293b;
      font-weight: 600;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
      backdrop-filter: blur(10px);
    }

/* Responsive Design */
    @media (max-width: 1200px) {
      .certificates-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
      }

.certificate-image {
        height: 260px;
      }
    }

@media (max-width: 992px) {
      .certificates-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
      }

.certificate-image {
        height: 280px;
      }
    }

@media (max-width: 768px) {
      .certifications-section {
        padding: 60px 0;
      }

.certifications-container {
        padding: 0 20px;
      }

.certifications-title {
        font-size: 36px;
      }

.certifications-description {
        font-size: 16px;
      }

.cert-tabs {
        gap: 8px;
      }

.cert-tab {
        padding: 10px 20px;
        font-size: 14px;
      }

.certificate-image {
        height: 240px;
      }

.lightbox-modal {
        padding: 20px;
      }

.lightbox-close {
        top: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
      }

.lightbox-info {
        bottom: 20px;
        font-size: 13px;
        padding: 10px 20px;
      }
    }

@media (max-width: 576px) {
      .certificates-grid {
        grid-template-columns: 1fr;
        gap: 20px;
      }

.certificate-image {
        height: 300px;
      }

.certifications-title {
        font-size: 28px;
      }

.lightbox-content img {
        max-height: 80vh;
      }
    }

International Standards
      
        Global Certifications & Quality Assurance

SOLETK Solar products are certified to meet international quality and safety standards, including Solar Keymark, CE, and ISO. Below are the individual certificates for each product, demonstrating SOLETK Solar's commitment to reliability, performance, and compliance.

All Certificates
      ISO Certifications
      Solar Keymark
      Product Certificates

Test Report

Test Report Certificate

Accepted Answer

Quality Assurance Report

Question 10

Solar Keymark Certification

Accepted Answer

European Quality Standard

Question 11

ISO 9001 Quality Management

Accepted Answer

International Organization for Standardization

Question 12

ISO 14001 Environmental Management

Accepted Answer

International Organization for Standardization

Question 13

ISO 45001 Occupational Health & Safety

Accepted Answer

International Organization for Standardization

Question 14

Air Solar Collector

Accepted Answer

Product Certification

Question 15

Flat Plate Solar Collector

Accepted Answer

Product Certification

Question 16

PVT Solar System

Accepted Answer

Product Certification

Question 17

Solar Keymark Certification

Accepted Answer

European Quality Standard

Question 18

Solar Water Heater

Accepted Answer

Product Certification

Question 19

Vacuum Tube Solar Collector

Accepted Answer

Product Certification

Question 20

ISO 9001 Quality Management

Accepted Answer

International Organization for Standardization

Question 21

ISO 14001 Environmental Management

Accepted Answer

International Organization for Standardization

Question 22

ISO 45001 Occupational Health & Safety

Accepted Answer

International Organization for Standardization

Question 23

Solar Keymark Certification

Accepted Answer

European Quality Standard

Question 24

Solar Keymark Certification

Accepted Answer

European Quality Standard

Question 25

Air Solar Collector

Accepted Answer

Product Certification

Question 26

Flat Plate Solar Collector

Accepted Answer

Product Certification

Question 27

PVT Solar System

Accepted Answer

Product Certification

Question 28

Solar Water Heater

Accepted Answer

Product Certification

Question 29

Vacuum Tube Solar Collector

Accepted Answer

Product Certification

Question 30

Solar Integration

Accepted Answer

Advanced flat-plate collector technology maximizing energy efficiency

Question 31

117+ Patents

Accepted Answer

Cutting-edge innovation portfolio protecting proprietary technologies

Question 32

Research Partners

Accepted Answer

Strategic collaboration with leading institutions worldwide

Building Scenario	Application Benefits
Residential / Commercial DHW	24/7 reliable hot water supply with lower heating cost
Hotels, Spas & Sports Centers	Efficient pool heating and extended annual use
Hybrid Heat Pump + Buffer Storage	Seasonal heating & cooling with reduced electric load
Solar-Geothermal Coupling	Supports cross-season energy storage and district heating

PVT-T Hybrid Saulės panelės Dual Energy, Maximum Efficiency

PVT-T Hybrid Solar Panel

Overview

Key Advantages

Dual-Energy Output: Electricity + Heat

Vacuum-Bonded Heat Transfer Layer

Three-Layer Thermal Insulation System

Smart Energy Monitoring & BEMS Ready

Pritaikymo scenarijai

Core Technology Features

High-Efficiency N-Type TOPCon PV Cells

Uniform Heat Transfer Architecture

Low-Loss Front Cover System

Rugged, Long-Life Structure

Why Choose the PVT-T Hybrid System?

Techninės specifikacijos

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Tianjin School TPV Pro+ Heat Pump Project

APEC Summit Hotel Hot Water System

Florida Resort Villa Hot Water Project

Harz Church Hot Water Project

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Plokščias saulės kolektorius

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Saulės vandens šildytuvas

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Plokščias saulės kolektorius

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Saulės vandens šildytuvas

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Vadovaujant ateities kryptims Švari energija

Mūsų pagrindinės stiprybės

Saulės integracija

117+ patentų

Tyrimų partneriai

SOLETKS – Pirmasis pasirinkimas pasauliniams klientams

Leiskime Susisiekti

PVT-T Hybrid
Saulės panelės
Dual Energy, Maximum Efficiency