- By: Sergey Fedorov
- Solar PV panels
- Updated: Dec 16, 2025
JA Solar Panels
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High-efficiency solar panels from China's leading Tier 1 manufacturer with 22% efficiency ratings

JA Solar stands as one of the world's top 5 solar panel manufacturers by volume, shipping over 12GW of panels in 2021 as a massive vertically integrated Chinese company producing wafers, cells and panels available in 135 countries and regions. In September 2024, they announced expectations to have over 100GW of panel manufacturing capacity by the end of the year, making them among the largest panel manufacturers globally.
Founded in 2005, JA Solar has built its reputation on delivering reliable, cost-effective solar solutions for residential, commercial, and utility-scale applications. The majority of manufacturing is located in China, with additional facilities in Vietnam and Malaysia.
DeepBlue 4.0 Series - Premium N-Type Panels
The flagship DeepBlue 4.0 series achieves efficiency ratings up to 22.4% through advanced n-type cell and Gapless Flexible Interconnection (GFI) technologies, with module power reaching 635W. The DeepBlue 4.0 Pro variant features Bycium cell technology with Open Circuit Voltage reaching 725mV and cell efficiency of 25.3% in mass production, enabling 72-cell modules to reach 630W with efficiency exceeding 22.5%.
"The JA Deep Blue 4 is a great panel. Glass is a very stable material so you should have a good lifespan from these panels and they carry a long warranty."
— Industry Installer
For more insights into solar panel performance and reviews, you might find our general Solar panels review 2025 useful.
DeepBlue 3.0 Series - Cost-Effective P-Type Options
The DeepBlue 3.0 range offers panels up to 605W built using 182mm Gallium-doped P-type PERC cells with lower degradation, while the compact DeepBlue 3.0 Light panels provide up to 420W output and 21.3% efficiency for residential systems.
Advanced Cell Technologies
JA Solar incorporates BYCIUM cell technology, which is a patented version of the TOPCon cell architecture, along with half-cut cell designs and bifacial capabilities across their product lines.
JA Solar vs Competition - Technical Comparison
| Feature | JA Solar DeepBlue 4.0 | Canadian Solar | Jinko Solar | LONGi Solar |
|---|---|---|---|---|
| Peak Efficiency | 22.5% | 22.9% | 22.8% | 22.3% |
| Power Output | Up to 635W | Up to 550W | Up to 575W | Up to 570W |
| Product Warranty | 25 Years | 12-25 Years | 15 Years | 12 Years |
| Performance Warranty | 30 Years | 25 Years | 25 Years | 25 Years |
| Manufacturing Origin | China/Vietnam/Malaysia | Asia | China | China |
While older JA Solar panels had 12-year product warranties, the company now offers 25-year product warranties for Deep Blue 4.0 panels, with performance warranties extending to 30 years.
Why Choose JA Solar?
🏭 Manufacturing Excellence
Giant manufacturer with concentrated focus on producing low-cost but reliable panels. Because they are reliable, well-supported, and good value for money, industry experts have no problem recommending them.
⚡ Advanced Technology
Deep Blue 4.0 series efficiency ranges from 21.8% to 23.4%, with most panels qualifying as "high efficiency" at 22% or more.
🔧 Proven Performance
One-year field test results from JA Solar and TÜV NORD showed n-type modules with Bycium cell technology have electricity generation gain of about 3.9% compared to conventional p-type modules.
💰 Value Proposition
JA Solar makes great panels for homeowners on a budget, with price per watt considerably lower than most other manufacturers, while delivering above-average efficiency ratings and outstanding value among affordable brands.
JA Solar Panel Reviews & Performance
Industry recognition continues to grow for JA Solar's technological advances. JA performs well in PVEL results and ranks as one of the top performing brands among the top six largest solar panel companies worldwide.
"I have only had the 440W JA Solar DeepBlue 4.0 Pro for 3 months. No complaints about performance in this short time."
— Residential User
"JA Solar Panels Deepblue 4.0 very promising on paper now with a 30-year performance warranty in line with closest competitors. Surprised how much energy I can still get even in cloudy conditions."
— Professional Installer
JA Solar Panel Pricing & Value Analysis
Compared to p-type modules, DeepBlue 4.0 Pro modules reduce BOS costs by approximately 2%-4.5%, leading to LCOE decreases of around 2.5%-6%. This cost advantage, combined with temperature coefficient of around 0.29% efficiency loss per degree above 25°C, delivers strong long-term value.
The JA Solar bifacial panels residential applications can achieve additional energy gains, particularly when combined with reflective surfaces or elevated mounting systems.
Frequently Asked Questions
JA Solar now offers 25-year product warranties for Deep Blue 4.0 panels sold in Australia, with performance warranties extending to 30 years.
JA Solar's BYCIUM cell technology is a patented version of the TOPCon cell architecture, offering improved efficiency and lower degradation compared to traditional PERC cells.
Yes, JA Solar offers all-black panels with no visible grid lines, which most solar customers prefer for aesthetic reasons.
JA Solar provides technical documentation, installer training resources, and ongoing support through authorized distributors and installation partners worldwide.
Ready to Go Solar with JA Solar Panels?
Get competitive pricing on high-efficiency solar panels from a proven Tier 1 manufacturer with industry-leading warranties and global support.
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