Out of stock

Trina 385W Solar Panel 144 cell Bifacial TSM-385DEG15HC.20(II) Wholesale

$241.59 /panel
price as of September 21
$0.628 /pw
Solar Loan from 6.99%
All Trina Solar products All 385 Watt Panels



Rated Power Output 385 W
Voltage (VOC)49.4 V
Maximum String Voltage 1500V
Cell number
  • 144 cell
Cell TypeMonocrystalline
Rated Efficiency18.7 %
Connector TypeMC4 EVO2/TS4
Frame Color
  • silver
Dimensions LxWxH79.96 × 39.80 × 1.18 in
Weight69.2 lb
Pallet Qty32
ManufacturerTrina Solar
Manufacturer Part #TSM-385DEG15HC.20(II)
Operating Temperatures -40 °F to +185 °F
Scope of Application
  • Solar Panels for Boats
  • Solar Panels for Commercial
  • Solar Panels for Home
  • Solar Panels for RV
  • Commercial
  • Grid-Tie
  • Off-Grid
  • Residential
Warranty10 year Product Workmanship Warranty / 30 year Linear Power Warranty
Delivery Time 5-7 business days

About product

Trina Solar 385W Duomax Twin is a 144-cell bifacial module for residential and commercial systems. The backside gain reaches up to 25%, depending on the albedo. Half-cut cell design ensures better shading tolerance and improves reliability of a panel.


  • 385W frontside power output
  • 144 cell bifacial monocrystalline module
  • Bifacial gain up to 25%
  • up to 23.4% efficiency with the active backside
  • MC4 EVO2/TS4 Connectors
  • 1500V Maximum system Voltage

Active backside provides high efficiency

The frontside of Duomax Twin puts out 385 Watts of power with 18.7% energy conversion rate. However, you can get up to 25% more energy from the backside. When it’s working at full capacity, the output of a module reaches up to 424 Watts with 23.4% efficiency.

Half-cut cell technology reduces power losses

Trina Solar engineers use half-cut cell design to reduce the power losses and increase the reliability of a module. Cells become more durable and the risk of hot spots development is lower. What is more, it increases the shading tolerance of a panel.

Ready for harsh weather conditions

Trina Solar panel is resistant to acid and alkaline. It is made to survive harsh weather conditions: wind, rain, hail, tornadoes and hurricanes. The module can withstand 2400 Pa load which is equivalent to 140 mph wind.

Comes with strong warranties

Duomax Twin comes with a 10-year product and workmanship warranty. What is more, there is a 30-year performance warranty. The panel loses no more than 2.5% of its power in the first year and no more than 0.5% in the subsequent years. After 30 years it retains over 83% of its output.


79.96 × 39.80 × 1.18 inches


69.2 lb

Reviews & Questions

  • Reviews (3)
  • Questions (2)
Really love that you added bifacial panels! My friend had a very positive experience with them so i was eager to try them out. They really feel much more powerful than standard ones.
04/19/2022 03:16 pm
The panel is cheap and it provides a lot of power so i don’t see a reason to complain. It might feel a bit flimsy, but it looks fine and the installer said that overall it was a fine choice by me.
04/15/2022 09:53 am
Very smooth and professional service. thank you for that
04/08/2022 07:10 pm

Leave a review

do you ship to alaska?
nick b
04/22/2022, 14:24
Not at the moment.
how do you install them so that the backside works well?
Ricky F.
04/05/2022, 18:19
Well, that’s a question for your installer. Generally, you make sure there is enough free space between the panel and the surface and you add a white membrane underneath the panel for higher reflectivity.