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LONGI 355W Solar Panel 120 cell LR4-HPB

Save $79.60
Pay $42.07 / month
Solar Loan from 6.99%
Minimum order – 6 panels

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

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All Longi Solar Technology products All 355 Watt Panels


Rated Power Output 355 W
Voltage (VOC)40.6V
Maximum String Voltage 1000V
Number of cells120
Cell TypeMonocrystalline
Rated Efficiency19.5 %
Connector TypeMC4 or MC4 compatible
Backsheet Colorblack
Frame Colorblack
Dimensions LxWxH69.09" x 40.87" x 1.38"
Weight43 lb
ManufacturerLongi Solar Technology
Manufacturer Part #LONGI355WLR4-HPB
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
  • Grid-Tie
  • Off-Grid
Warranty12-year warranty extendable 25 years
Delivery Time 5-7 business days

About product

LONGI 355W LR4-HPB is a 120 cell solar panel, which combines high efficiency and low LID mono PERC cells. This module has a 35mm lightweight frame resilient enough to withstand 5400Pa load and 25mm hailstones at the speed of 23 m/s.

  • 355W Power Output
  • 120 Cell, Monocrystalline, Half-Cut Technology
  • 19.5% Module Efficiency
  • Low LID mono PERC cells
  • 1000 Volts Max Voltage
  • MC4 connectors
  • Black frame, black back

19.5% Panel Efficiency

LONGI 355W LR4-HPB performs at 19.5% efficiency, ensuring greater energy yields. It shows outstanding power output in low light conditions, such as dawn, dusk and on a cloudy day, with guaranteed positive power tolerance of 0~ 5W.

Quality and Reliability

All LONGI panels undergo a number of stringent quality control tests. Solid PID resistance is ensured by solar cell process optimisation and careful module BOM selection. LONGI 355W LR4-HPB is designed to withstand front side maximum static loading of 5400Pa and rare side maximum static loading of 2400Pa.

Slow Power Degradation

Slow power degradation is achieved due to Low LID Mono PERC technology. First year the panel degrades <2%, and 0.55% over the next 24 years.

Enhanced Frame Design

The module’s 35 mm frame design provides easy installation and ensures robust mechanical strength. This module passed rigorous ammonia and salt mist resistance tests.

25-Year Power Output Warranty

LONGI 355W LR4-HPB comes with a 12-year product warranty for materials and processing and 25-year warranty for extra linear power output.


69.09" x 40.87" x 1.38"


43 lbs

Reviews & Questions

  • Reviews (3)
  • Questions (2)
it’s been 6 month since i went off-grid with these panels. so far so good. tip: If you plan to do it, you need good batteries. just don’t buy them in advance like i did. i stored a battery in garage and didn’t use it and now it works much worse than others.
07/17/2021 10:44 am
I bought these panels almost a year ago. Chinese ones are always cheaper, but their quality is all right to me. There was a huge tornado here in the end of the spring, winds were rough, but the panels surprisingly survived all that. I’m quite impressed, thx!
06/23/2021 07:24 pm
Very good service. The panels look good and are quite cheap. I wouldn’t say that they are anything special, but they do their job. Good performance even when there isn’t a lot of sunlight.
06/12/2021 01:23 pm

Leave a review

Can I buy 2 if I pick up.
07/10/2021, 17:12
Yes, you can.
Is there an east coast warehouse where I can pickup?
05/11/2021, 19:39
Yes, we have warehouses on east coast in Fontana, Sacramento.Yes, we have warehouses on east coast in Fontana, Sacramento.