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JA Solar 390W Solar Panel 108 cell JA-JAM54-S31-390MR

Pay $34.10 / month
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Minimum order – 6 panels

We have changed the number of solar panels to comply with shipping terms.

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All JA Solar products All 390 Watt Panels



Rated Power Output 390 W
Voltage (VOC)36.85 V
Maximum String Voltage 1500V
Cell number
  • 108 cell
Cell TypeMonocrystalline
Rated Efficiency20%
Connector TypeMC4
Backsheet Color
  • black
Frame Color
  • black
Dimensions LxWxH67.8 x 44.65 x 1.18 in
Weight47.4 lb
Pallet Qty36
ManufacturerJA Solar
Manufacturer Part #JA-JAM54-S31-390MR
Operating Temperatures −40°F to +185°F
Scope of Application
  • Solar Panels for Commercial
  • Solar Panels for Home
  • Commercial
  • Grid-Tie
  • Off-Grid
  • Residential
Warranty12-year warranty extendable 25 years
Delivery Time 5-7 business days

About product

Among the newest offerings of JA Solar, JAM54S31 is part of the 380-405/MR series. These panels use state-of-the-art technology to achieve high efficiency and dependability. This panel takes full advantage of the Passivated Emitter Rear Contact (PERC) technology that allows it to capture up to 12% more energy. All thanks to a reflective layer on the back. This design maximizes the number of photons absorbed by solar cells. 

Half-cut cell technology adds a few more percent to the overall performance, making this model a great example of efficiency. JA Solar made solar cells in JAM54S31 two times smaller than the standard size, thus reducing power loss and improving low-light behavior. At 20% efficiency, JAM54S31 offers surprising performance for its weight and size. The innovations made the appearance of the panel as impressive as the specs. A mere 1.18" thick, this model is completely black with a smooth surface. This beauty doesn’t compromise the quality or reliability of the panel. JA Solar provides a 12-year product warranty. Stable power output is also guaranteed — performance warranty will protect you during 25 years. 

  • 390 W power output
  • 108 half-cut PERC cells
  • 20% efficiency
  • 1500 V DC maximum system voltage
  • MC4 connectors
  • 12-year product and 25-year performance warranties

More energy and efficiency

The PERC technology further improves an already excellent efficiency of 20 percent. A reliable PID resistance and a unique glass lamination were added by the maker, which ultimately produced a model that was effective and extremely durable. JAM54S31 produces 390 W of power under typical test settings.

Heat-resistant performance

The heat is less of a threat with this module: with one of the lowest temperature coefficients in the industry, JAM54S31 loses just 0.36% of efficiency for every 1.8°F above 77°F.

High quality standards

Multiple tests are part of the JA Solar tight production requirements, which offer the highest level of quality assurance. Because of the facilities' high degree of automation, the business is able to uphold strict standards and minimize the number of warranty claims to an absolute minimum.

Reliability and degradation resistance

Slow degradation over the next 25 years is guaranteed by JA Solar. The performance will decrease no more than 2% during the first year and 0.25% annually thereafter. Your modules will retain at least 84.8% of original performance after the 25 years are over. This 390 W JA Solar solar panel also comes with a generous 12-year product warranty.

Enhanced frame design

JAM54S31 design makes it ideal for residential and commercial rooftops. Strong 1.18" frame made from anodized aluminum increases durability and strength. The model can support a heavy snow load up to 3600 Pa. The back of the panel can handle 1600 Pa, ensuring that your system will survive the strongest of winds.

Outstanding all-black design

The panel has a sleek, all-black style that complements any roof beautifully. JA Solar uses unique treatment and selection procedures to guarantee optimum cell color. The cells are connected by thinner wires, and from a distance, the surface of the modules seems seamless and smooth.


67.8" x 44.65" x 1.18"


47.4 lb

Reviews & Questions

  • Reviews (2)
  • Questions (3)
The installer suggested these panels due to their reasonable price, long warranty period, and high reliability. So far we can say that the installer was right
Oreo Cookie
12/19/2022 01:56 pm
The moment I contacted the firm, everyone I spoke with went above and beyond to assist me. They did excellent job, were courteous and helpful even when I asked dumb questions. It took less than five days to deliver everything. This is a customer-centric business that values its customers and strives to provide them with the highest quality service.
Barbara C. Nazario
12/19/2022 01:48 pm

Leave a review

can I able to use Enphase IQ7X Micro Inverters with this panel?
12/19/2022, 13:39
The IQ7X microinverter is compatible with panels between 320 and 460 W. This JA model seems a good match.
what is the solar energy density
12/19/2022, 03:31
The energy density of this model is 18.75 watts/ft².
If i get 4 panels what all is needed to get up and running, saving me money
Rick Young
12/18/2022, 13:22
This seems too broad a question to tackle it in a short reply. But we have written a number of articles on the topic. Click "Magazine" at the very top of our website to see them.