Out of stock

LONGI 445W Solar Panel 144 cell LR4-72HBD

price as of July 20
All Longi Solar Technology products All 445 Watt Panels


Rated Power Output 445 W
Voltage (VOC)49.4 V
Number of cells144
Cell TypeMonocrystalline
Rated Efficiency20.5%
Connector TypeMC4 or MC4 compatible
Backsheet Colorwhite
Frame Colorsilver
Dimensions LxWxH82.5" x 41" x 1.38"
Weight60.6 lb
ManufacturerLongi Solar Technology
Manufacturer Part #LONGI445WLR4-72HBD
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
Delivery Time 5-7 business days

About product

445w LONGi 144 half-cut cells, transparent backsheet, 1400mm cables, MC4, 35mm silver frame.

LONGi LR4-72HBD 445w is a model that uses a number of technologies to bring durability and performance to the next level.

This module takes full advantage of half-cut cell technology for lower resistive losses and better shade tolerance. At the same time, bifacial design allows the panels to produce up to 25% more electricity. By adding a solid PID resistance and special glass lamination on top, the manufacturer ended up with an efficient and very durable model that is guaranteed to retain at least 84.95% of output after 30 years.

More power output

An already high efficiency of 20.5% is further enhanced by bifacial design, which allows to harvest up to 25% more energy from the back side of the panel. The heat is also less of a threat with this module: with one of the lowest temperature coefficients in the industry, LONGi 445w loses just 0.35% of efficiency for every 1.8°F above 77°F. Half-cut cell technology adds a few more percentage points to the final count, making this model an outstanding example of efficiency.

Optimized design for higher reliability

Careful module BOM selection and solar cell process optimization ensure solid PID resistance. Enhanced electrical design and lower operating current reduce the risk of hot spot formation and decrease resistive losses.

A panel that can handle hail, wind and snow

A 35 mm frame made from anodized aluminum alloy and 2 mm layer of protective tempered glass make this module resistant to the foulest of weather. These panels pass a hailstone test where they take on 1″ hail grains at the speed of 51 mph. The front side of the modules can resist a 5400 Pa load, and the back side 2400 Pa.

30 year power warranty

Slow degradation over the next 3 decades is guaranteed by the manufacturer. The performance will decrease no more than 2% during the first year and then will be limited to 0.45% annually. Your modules will retain at least 84.95% of original performance 30 years later. The manufacturer also offers a 12 year product warranty.

Product details

  • Manufacturer Part Number: LR4-72HBD-445M (1400 mm / MC4)
  • Power Output: 445 Watts
  • 144 Cell, Bifacial Monocrystalline
  • 35mm Depth, Silver Frame, Transparent Backsheet
  • 1500 Volts Max Voltage
  • Shipping Weight: 60.6 lb
  • Shipping Dimensions: 82.5 x 41 x 1.38 in
  • Pallet Qty: 30

Reviews & Questions

  • Reviews (3)
  • Questions (4)
These panels are incredibly efficient. We use them on a farm to power all our gardening needs
Marcel Desrosiers
07/03/2021 12:52 pm
30 year warranty was a bit of a surprise at this price point. This alone was enough for me to make a decision. A1 solar store didn’t make me regret it. They handled my order with utmost care and I got the panels on the 4th day.
06/04/2021 02:31 pm
A lot of solar panels go through my hands. These modules are excellent and I would recommend them to a friend.
Chuck Arnold
05/12/2021 11:10 am

Leave a review

Do they come with mounting hardware?
JIm k
08/09/2021, 21:28
No. Panels only.
144 half cells are the same as normal 72 cells, or does some other math apply here?
Rose Forsyth
06/24/2021, 15:29
You are right. Since the cells are cut in half, we get two half-cut cells from one normal sized cell.
What shipping method is used for these panels?
Clark Dunlop
05/21/2021, 13:27
We work with the best carriers, such as XPO Logistics and FedEx.
What is meant by a transparent backsheet? What is it made of?
04/12/2021, 09:09
This model has a glass backsheet.


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