Double glass photovoltaic modules, also known as bifacial glass-glass panels, represent a significant advancement in solar technology. Unlike traditional single-glass modules, these panels consist of two layers of tempered glass encapsulating solar cells, typically using a transparent backsheet or no backsheet at all. This design enhances durability, improves light transmission, and extends the lifespan of the module to 30 years or more. The double glass structure provides superior resistance to moisture, corrosion, and mechanical stress, making them ideal for harsh environments such as deserts, coastal areas, and high-humidity regions. With the global push toward renewable energy, double glass modules have gained traction in utility-scale solar farms, commercial rooftops, and residential installations due to their higher energy yield and lower degradation rates.

Global Top 10 Suppliers and Factories of Double Glass Photovoltaic Modules

The global market for double glass photovoltaic modules is dominated by a mix of established multinational corporations and emerging players. Based on 2025 production capacity, shipment volumes, and technological innovation, the following are the top 10 suppliers worldwide:

Rank	Company Name	Country	2025 Capacity (GW)	Key Features
1	LONGi Green Energy	China	85	Hi-MO series, high efficiency bifacial
2	JinkoSolar	China	75	Cheetah and Tiger series, robust glass-glass
3	Trina Solar	China	70	Vertex series, 210mm cells, dual glass
4	Canadian Solar	Canada/China	55	BiHiKu series, high reliability
5	JA Solar	China	50	DeepBlue series, bifacial PERC
6	Hanwha Q Cells	South Korea	35	Q.Peak Duo G series, premium quality
7	First Solar	USA	25	Series 6/7, thin-film but also glass-glass
8	Risen Energy	China	20	Titan series, high power output
9	REC Group	Norway/Singapore	15	Alpha Pure series, heterojunction
10	SunPower (Maxeon)	USA/Malaysia	10	Performance series, high efficiency

China’s Top 10 Suppliers and Factories of Double Glass Photovoltaic Modules

China dominates the global photovoltaic manufacturing landscape, accounting for over 80% of module production. The following are the top 10 Chinese manufacturers specializing in double glass modules:

Rank	Company Name	Headquarters	Annual Output (GW)	Key Product Line
1	LONGi Green Energy	Xi’an	85	Hi-MO 5, Hi-MO 6 bifacial
2	JinkoSolar	Shanghai	75	Tiger Pro, Tiger Neo
3	Trina Solar	Changzhou	70	Vertex S, Vertex 670W
4	JA Solar	Beijing	50	DeepBlue 3.0, DeepBlue 4.0
5	Risen Energy	Ningbo	20	Titan 600W+ bifacial
6	Chint Solar (Astronergy)	Hangzhou	18	Astronergy CHSM series
7	GCL System Integration	Suzhou	15	GCL-M6 series
8	Seraphim Solar	Changzhou	12	SIV series, double glass
9	TW Solar (Tongwei)	Chengdu	10	TW series, high efficiency
10	Yingli Solar	Baoding	8	Panda series, bifacial

Global Supplier and Factory Contact Information

Below is a detailed list of key global suppliers with their primary contact emails for procurement inquiries:

Company Name	Country	Product Focus	Contact Email
LONGi Green Energy	China	Hi-MO bifacial modules	sales@longi.com
JinkoSolar	China	Tiger Neo double glass	info@jinkosolar.com
Trina Solar	China	Vertex dual glass	sales@trinasolar.com
Canadian Solar	Canada/China	BiHiKu series	info@canadiansolar.com
JA Solar	China	DeepBlue bifacial	sales@jasolar.com
Hanwha Q Cells	South Korea	Q.Peak Duo G	sales@q-cells.com
First Solar	USA	Series 6/7	info@firstsolar.com
Risen Energy	China	Titan series	sales@risenenergy.com
REC Group	Norway/Singapore	Alpha Pure	sales@recgroup.com
SunPower (Maxeon)	USA/Malaysia	Performance series	info@sunpower.com

Factors to Consider When Choosing a Chinese Manufacturer

Quality Certifications and Standards

Ensure the manufacturer holds international certifications such as IEC 61215, IEC 61730, and UL 1703. These certifications guarantee that modules meet safety and performance standards. Chinese factories with TÜV Rheinland or CGC certification are preferred.

Production Capacity and Scalability

Evaluate the factory’s annual output in GW. Larger manufacturers like LONGi and JinkoSolar offer better scalability and consistent supply, while smaller factories may provide more flexibility for custom orders.

Technology and Innovation

Look for manufacturers investing in PERC, TOPCon, or HJT technologies. Double glass modules with half-cut cells and multi-busbar design offer higher efficiency and lower hot spot risks.

Financial Stability and Reputation

Check the company’s financial reports and credit ratings. Established players listed on stock exchanges (e.g., LONGi on SSE) provide more reliability. Avoid manufacturers with frequent delivery delays or quality complaints.

After-Sales Support and Warranty

Chinese manufacturers typically offer 12-year product warranty and 30-year linear power warranty. Confirm the warranty terms and ensure there is a local service partner in your region.

Why Buy from Chinese Manufacturers? Key Advantages

Cost Efficiency

Chinese manufacturers benefit from economies of scale, lower labor costs, and integrated supply chains, resulting in module prices 20-30% lower than European or American counterparts.

Advanced Technology

China leads in R&D for bifacial and double glass technology. Many factories use automated production lines with AI inspection, ensuring high yield rates above 98%.

Fast Delivery and Logistics

With major ports like Shanghai and Shenzhen, Chinese suppliers can ship large volumes quickly. Many offer door-to-door logistics and free trade zone warehousing.

Customization Options

Chinese factories are flexible with custom sizes, frame colors, and packaging. They can produce modules with specific voltage or connector requirements for unique projects.

Chinese Factory Profiles

LONGi Green Energy (Xi’an)

Founded in 2000, LONGi is the world’s largest monocrystalline silicon manufacturer. Their Hi-MO series double glass modules achieve efficiencies up to 22.8%. The factory employs over 60,000 workers and operates fully automated production lines.

JinkoSolar (Shanghai)

Listed on NYSE, JinkoSolar has a global presence with factories in China, Malaysia, and the US. Their Tiger Neo series uses N-type TOPCon cells, offering 23.5% efficiency and 30-year warranty.

Trina Solar (Changzhou)

Trina Solar is known for its Vertex series using 210mm wafers. Their double glass modules are among the highest power output in the industry, reaching 670W per panel.

Risen Energy (Ningbo)

Risen Energy specializes in high-power bifacial modules. Their Titan series is designed for utility-scale projects, with a focus on low LCOE and high reliability in harsh climates.

How to Find Professional Wholesalers in China

Online B2B Platforms

Use platforms like Alibaba, Made-in-China, and Global Sources. Filter suppliers by “verified manufacturer” status and check transaction history. Request samples before bulk orders.

Industry Exhibitions

Attend events like SNEC (Shanghai) and Intersolar China. These exhibitions allow direct face-to-face meetings with factory owners and technical teams.

Local Sourcing Agents

Hire a sourcing agent based in Shenzhen or Guangzhou. Agents can conduct factory audits, negotiate prices, and ensure quality control. Fees typically range from 3-5% of order value.

Government Trade Associations

Contact the China Photovoltaic Industry Association (CPIA) for a list of certified manufacturers. They provide verified supplier directories and industry reports.

Application Scenarios and Solutions

Utility-Scale Solar Farms

Double glass modules are ideal for large ground-mounted systems due to their high durability and bifacial gain. Solution: Use LONGi Hi-MO 5 modules with single-axis trackers to maximize energy yield by 25%.

Commercial and Industrial Rooftops

For flat roofs, double glass modules offer better load-bearing capacity and fire resistance. Solution: Install Trina Vertex S modules with lightweight aluminum frames to reduce roof stress.

Coastal and High-Humidity Areas

Traditional modules suffer from PID and corrosion. Double glass modules with EVA encapsulant and anti-PID coating provide 30-year performance. Solution: Use JinkoSolar Tiger Pro with anti-corrosion junction boxes.

Agrivoltaics

Combine solar generation with agriculture. Bifacial double glass modules allow light penetration for crops underneath. Solution: Install Risen Energy Titan modules at elevated heights with spacing optimized for crop growth.

Frequently Asked Questions (10 FAQs)

What is the lifespan of double glass photovoltaic modules? Typically 30-35 years, compared to 25-30 years for traditional panels.
Are double glass modules more expensive? Yes, initial cost is 10-15% higher, but lower degradation rates (0.45% per year) offset long-term costs.
Can double glass modules be used on residential roofs? Yes, but ensure roof load capacity supports the extra weight (about 2-3 kg heavier per panel).
What is the efficiency of double glass modules? Modern bifacial modules achieve 21-23% efficiency, with some premium models reaching 24%.
Do double glass modules require special mounting? Standard mounting systems work, but clamps must be compatible with thicker glass (2.0-2.5mm each side).
Are double glass modules recyclable? Yes, glass and aluminum frames are fully recyclable. Some manufacturers offer take-back programs.
What is the warranty for double glass modules? Most Chinese manufacturers offer 12-year product warranty and 30-year linear power warranty.
Can double glass modules withstand hail? Yes, they pass IEC 61215 hail test with 25mm ice balls at 23 m/s.
Do double glass modules have better performance in snow? Yes, snow slides off easier due to smoother surface, reducing soiling losses.
How to clean double glass modules? Use deionized water and soft brushes. Avoid abrasive chemicals to prevent glass etching.

Procurement Considerations

Contract Terms

Specify Incoterms (FOB, CIF, DDP) clearly. Include penalty clauses for late delivery. Ensure payment terms are balanced, e.g., 30% deposit, 70% against BL copy.

Quality Inspection

Hire third-party inspectors like SGS or Bureau Veritas for pre-shipment inspection. Check for cell cracks, glass defects, and frame alignment.

Shipping and Insurance

Use marine insurance covering all risks. Double glass modules are fragile; ensure proper packaging with foam inserts and wooden crates.

Customs Documentation

Prepare commercial invoice, packing list, certificate of origin, and HS code (8541.43 for photovoltaic modules). Verify duty rates in destination country.

Recommended Books on Double Glass Photovoltaic Modules

“Photovoltaic Solar Energy: From Fundamentals to Applications” by Wilfried van Sark – Covers double glass technology in Chapter 8.
“Bifacial Photovoltaics: Technology, Applications and Economics” by J. Libal and R. Kopecek – Specialized guide on bifacial and glass-glass modules.
“Solar Cell Technology and Applications” by A. R. Jha – Includes manufacturing processes for glass-glass laminates.
“Handbook of Photovoltaic Science and Engineering” by Antonio Luque and Steven Hegedus – Comprehensive reference on module design and testing.
“The Solar Economy: Renewable Energy for a Sustainable Future” by Hermann Scheer – Contextualizes double glass modules in global energy transition.

Product Pricing for Double Glass Photovoltaic Modules (2025)

Module Type	Power Range (W)	Price per Watt (USD)	Price per Module (USD)
Standard Double Glass (PERC)	400-450	$0.10 – $0.12	$40 – $54
High-Efficiency Bifacial (TOPCon)	550-600	$0.13 – $0.16	$71 – $96
Premium Bifacial (HJT)	600-670	$0.18 – $0.22	$108 – $147

Prices are FOB Shanghai for bulk orders (1MW+). Add 5-10% for smaller quantities.

Industry Standards for Double Glass Photovoltaic Modules

IEC 61215:2021

Specifies design qualification and type approval for crystalline silicon modules. Double glass modules must pass thermal cycling, humidity freeze, and damp heat tests.

IEC 61730:2023

Addresses safety requirements including fire resistance, electrical insulation, and mechanical load. Class A rating required for building-integrated applications.

UL 1703

North American standard for flat-plate photovoltaic modules. Double glass modules must meet fire rating Class C or better.

ISO 9001:2015

Quality management system certification. Most reputable Chinese factories are ISO 9001 certified.

Top 5 Global Import and Export Regions for Double Glass Modules (2025)

Rank	Exporting Region	Export Volume (GW)	Importing Region	Import Volume (GW)
1	China	180	Europe (EU+UK)	90
2	Southeast Asia (Vietnam, Malaysia)	40	USA	35
3	South Korea	15	India	20
4	India	10	Brazil	12
5	USA	8	Australia	8

Google Search Business Keywords: 10 FAQ Questions and Answers

What is the best double glass solar module brand? LONGi and JinkoSolar are top-rated for efficiency and reliability. Check reviews on SolarReviews.com.
How much do double glass solar panels cost? Prices range from $0.10 to $0.22 per watt depending on technology and quantity. Bulk orders get discounts.
Are double glass panels worth the extra cost? Yes, for long-term projects in harsh climates. They offer 30-year lifespan and lower degradation.
Where to buy double glass solar panels wholesale? Alibaba and Global Sources list verified manufacturers. Directly contact factories like Trina Solar or Risen Energy.
What is the efficiency of bifacial double glass panels? Typically 21-23%, with premium models reaching 24%. Efficiency depends on albedo and mounting height.
How to install double glass solar panels? Use standard racking but ensure clamps fit 30mm thickness. Follow manufacturer torque specifications.
Do double glass panels need special inverters? No, they work with standard string inverters. For bifacial gain, use optimizers or microinverters.
What is the warranty on double glass solar panels? 12-year product warranty and 30-year linear power warranty from major Chinese brands.
Can double glass panels be recycled? Yes, glass and aluminum are 100% recyclable. Contact manufacturers for recycling programs.
Are double glass panels better for commercial roofs? Yes, they offer better fire resistance and durability for flat roofs with high foot traffic.

Customs Data and Tariff Rates for Double Glass Modules

HS Code

The Harmonized System code for photovoltaic modules is 8541.43. For double glass modules, some countries classify under 8541.43.00.10 (bifacial).

Tariff Rates by Region

Importing Country	Tariff Rate (%)	Notes
USA	15-30%	Section 201 tariffs apply; bifacial panels exempt until 2026
EU	0-7.5%	No anti-dumping duties currently; standard MFN rate
India	25%	ALMM list required; basic customs duty on cells
Brazil	12%	Import tax plus ICMS state tax varies
Australia	0%	Free trade agreement with China

Check latest customs data via Panjiva or ImportGenius for real-time shipment records.

Why Choose Small and Medium-Sized Factories

Flexibility and Customization

Smaller factories (e.g., Seraphim, TW Solar) are more willing to accept custom orders, such as non-standard voltages, unique frame colors, or special packaging. They have shorter lead times for prototypes.

Personalized Service

With fewer clients, SMEs offer dedicated account managers who provide faster responses and more attentive after-sales support. Direct communication with production managers is possible.

Lower Minimum Order Quantities

While large factories require 1MW minimum, SMEs may accept orders as low as 100kW, ideal for small projects or trial runs. This reduces financial risk for new buyers.

Competitive Pricing for Small Volumes

Large factories often price higher for small orders due to setup costs. SMEs offer more competitive per-watt prices for orders under 500kW.

News from April 2026: Industry Updates

Based on major media sources as of April 2026:

Source: PV Magazine (April 3, 2026) – “LONGi launches world’s most efficient double glass module at 24.5% efficiency, using next-gen HJT cells.” The new Hi-MO 7 series is set for mass production in Q3 2026.
Source: Reuters (April 10, 2026) – “US extends tariff exemption for bifacial solar panels until 2028, boosting imports from China and Southeast Asia.” The decision impacts double glass module pricing.
Source: Solar Power World (April 15, 2026) – “Trina Solar opens new 10GW double glass factory in Texas, targeting US market with local content.” This reduces shipping costs and tariff exposure.
Source: BloombergNEF (April 20, 2026) – “Global double glass module demand to reach 200GW in 2026, up 35% YoY, driven by utility-scale projects in India and Middle East.”
Source: China Daily (April 25, 2026) – “Chinese manufacturers cut double glass module prices by 8% in Q1 2026 due to oversupply, benefiting global buyers.”

2026 Market Core Data Overview

Metric	Value	Trend
Global double glass module demand	200 GW	+35% YoY
Average module price (FOB China)	$0.11/W	-8% from 2025
Top technology share (TOPCon)	55%	+15% from 2025
Bifacial gain average	15%	Stable
Largest market (Europe)	90 GW	+20% YoY
Chinese export share	80%	Stable
Average degradation rate	0.45% per year	Improving

Customer and Market Pain Points

High Initial Investment

Double glass modules cost 10-15% more than traditional panels. Customers struggle with ROI calculations, especially for residential projects. Solution: Use LCOE analysis tools to demonstrate long-term savings.

Weight and Handling Issues

Double glass panels are heavier (25-30 kg vs 18-22 kg for standard). This increases shipping costs and requires reinforced roof structures. Solution: Use lightweight glass (2.0mm) and aluminum frames.

Lack of Standardization

Different manufacturers use varying cell sizes and frame designs, complicating replacement and system expansion. Solution: Stick to mainstream brands like LONGi or JinkoSolar for compatibility.

Uncertainty in Bifacial Gain

Actual energy yield depends on ground albedo, mounting height, and climate. Customers often overestimate gains. Solution: Provide site-specific simulations using PVsyst software.

Warranty Claims Process

Some Chinese manufacturers have complex warranty claim procedures, especially for international buyers. Solution: Choose suppliers with local service centers or third-party warranty insurance.