JA Solar Panels 2025 Expert Review

JA Solar Holdings Co. is a leading manufacturer of high-efficiency photovoltaic solar panels, based in Shanghai, China with several global offices, including one in San Jose, California. They produce high-performance solar panels for residential, commercial, and utility-scale projects. JA Solar took the number two spot on the SolarReviews' Best Solar Brands of 2025. 

Are JA Solar panels good? Yes, they are quite good. The panels use modern technology and JA Solar offers a good warranty to back up its products. Furthermore, the company is publicly traded and has a strong history of financial performance and profitability. For these reasons, we recommend JA Solar panels.

Our full review below covers the company’s residential solar panels for the U.S. market, detailing their specifics and warranty details.

What JA Solar panels are available?

JA Solar’s lineup of modules for the U.S. residential market includes the Deep Blue 3.0 (aka JAM54S31/MR) and Deep Blue 4.0 (JAM54D40/LB). JA uses half-cut solar cells in its residential panels, which helps increase their efficiency. 

Deep Blue 3.0 solar panels

Deep Blue 3.0 is JA Solar’s older product line. The panels in this series use PERC solar cells and offer between 19.5% and 20.7% efficiency. This translates to a power output rating of 380 to 405 watts respectively. Deep Blue 3.0 residential panels are all black to provide a sleek look on the roof.

Check out the Deep Blue 3.0 datasheet for more information.

Deep Blue 4.0 solar panels

Deep Blue 4.0 panels are JA Solar’s newest and most powerful product line. The panels in this series use TOPCon solar cell technology and range from 21.8% to 23% efficiency. They have a rated output of between 435 and 460 watts under full sun. 

See the JA Solar datasheet for Deep Blue 4.0 panels for more information.

How much do JA Solar panels cost?

JA Solar panels are some of the least expensive on the market. We estimate that an average-sized installation using JA Solar panels will cost about $2.91 per watt. The nationwide average cost per watt for a solar panel installation is $3.03, so JA solar panels are significantly cheaper. 

Those are the averages, but the total cost for a solar installation will vary per project, and the price can change based on factors like local labor cost, distribution, state solar rebates and incentives, and more. The best way to find pricing for your own solar installation is to get a commitment-free quote from local installers.

What is the JA Solar warranty?

JA Solar offers a 12-year product replacement warranty, which is around the industry standard for solar warranties. That said, many other brands extend their product replacement warranty to 25 years, and we’d like to see JA Solar do the same. 

The JA Solar panel warranty also includes 25 years of performance coverage. The company guarantees its solar panels will produce at least 97% of their rated power output after one year, and at least 82.5% by the end of year 30. That’s also about in line with the industry average, but again, we’d prefer something like Canadian Solar’s warranty, which guarantees 99% power output after 1 year and 87.4% by the end of 30 years. 

Do we recommend JA Solar panels?

Yes, SolarReviews recommends using JA Solar panels for your home solar panel installation. JA Solar is a high-quality brand with highly efficient solar panels that offers a good warranty. 

In fact, we awarded the company 2nd place in our list of the top 10 solar panel brands for 2025. 

Ultimately, the most important part of choosing which solar panels to go with is choosing your installer. A local installer with good reviews that has been in business for at least a few years is your best bet. They will be there to help every step of the way from the installation, to years down the line if you need help with your solar system. If they use JA Solar panels, it is because they find them the most practical, trustworthy option and you can trust their recommendation.Yes, SolarReviews recommends using JA Solar panels for your home solar panel installation. JA Solar is a high-quality brand with highly efficient solar panels that offers a good warranty. 

In fact, we awarded the company 2nd place in our list of the top 10 solar panel brands for 2025. 

Ultimately, the most important part of choosing which solar panels to go with is choosing your installer. A local installer with good reviews who has been in business for at least a few years is your best bet. They will be there to help every step of the way, from the installation to years down the line if you need help with your solar system. If they use JA Solar panels, it is because they find them the most practical, trustworthy option and you can trust their recommendation.