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LONGI 355W Solar Panel 120 cell LR4-60HPB-355M

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
Pallet Qty30
ManufacturerLongi Solar Technology
Manufacturer Part #LR4-60HPB-355M
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 LR4-60HPB 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 LR4-60HPB 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 LR4-60HPB 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 LR4-60HPB 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 (0)
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.
01/11/2024 10:57 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!
01/11/2024 10:57 am
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.
01/11/2024 10:57 am

Leave a review


How much is shipping and how long is delivery?
Our standard shipping charge is $250 for up to 11 panels and it is increased by $25 for every 4 additional panels. In the event, the product is only available on East or West coast custom quote will be sent to you before the order is processed. Normally, we are able to deliver solar panels within 7 business days.
What is the difference between low price panels and top price panels?
With top tier solar panels, you pay for the brand name, proprietary new technology, higher energy output, and better warranty support.
What are the dimensions of the panel?
Please refer to the product datasheet on the product page. We have a datasheet for every product we sell.
How long is the warranty on the panel?
In general, manufacturers provide a 25 year-long performance warranty and a 10 year-long equipment guarantee. Some manufacturers offer 12-15 years of warranty. More information is available in our warranty support section.
Which panels do you recommend for RV, marine?
We recommend Panasonic and Mission Solar panels for smaller systems as their high energy output and excellent craftsmanship guarantee years of service.
Can this panel be used with a 12v system?
Any of our panels can be used for a 12v system with a properly selected inverter and charge controller.
Can I pick up this panel from your fulfillment center to save on shipping?
Yes, we can set up a pick up at a local distributor. Please call to discuss options and stock availability.
How do I connect these panels?
To achieve the best system efficiency, panels should be connected in series to create higher voltage.
How many panels do I need?
This number is determined by your average energy needs. Depending on the type of panels and energy consumption, you might need anywhere from 12 to 45 solar panels. Remember, the more panels you install the more energy you will get.Please use our solar calculator to estimate your energy consumption and plan on building a solar system that will exceed your energy needs by 25%.
Do you offer discounts?
We do offer discounts for orders of over 50 units. Please contact us for details.
How do I build a solar system?
Please use our solar calculator to estimate what equipment you need. Choose your panels, microinverters, inverters, and solar batteries if necessary.Please note that we do not offer solar system design or installation.
How do solar panels compare?
Solar panels differ by power output, voltage, connection type, size, efficiency, and weight. Some solar panels might be sold together with microinverters as a set.
Can I build a solar system by myself as a Do It Yourself project?
Yes, it is possible if you understand what solar equipment you need and how to connect it together. However, please be mindful that handling your own electrical work without having proper experience might cause life-threatening injuries. Please contact a certified electrician if you do not possess appropriate electrical skills.
Can I connect and charge my solar panel battery directly with the solar panel?
We do not recommend using the solar panel without the charge controller. Using solar panels without the charge controller might damage the batteries.
Can I drill holes into the aluminum frame for mounting?
We do not recommend drilling any new holes to the aluminum frame of the panel as it could damage the internal circuit and solar cells. (Also, any modification to the panel will void the warranty). We recommend only using the pre-drilled holes for mounting.
Do solar panels require maintenance? Can I wash my solar panel?
Solar panels generally require very little maintenance. We recommend cleaning the solar panel with water, glass cleaner (Windex) and microfiber cloth.
Will my panel produce power in an overcast condition?
While solar panels require sunlight to generate solar energy, they will still work in cloudy weather. Even on a cloudy day, solar panels will produce energy just not as much.
Will my panels produce power if covered with snow?
Solar panels cannot produce electricity if covered with snow.
What is the best direction for a solar panel to face?
The best direction for a solar panel to face is the South