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Sonali 440W Solar Panel 144 Cell SS-M-440

price as of November 10
All Sonali Solar products All 440 Watt Panels



Rated Power Output 440 W
Voltage (VOC)41.2 V
Maximum String Voltage 1500V
Cell number
  • 120 cell
Cell TypeMonocrystalline
Connector TypeMC4
Backsheet Color
  • white
Frame Color
  • black
Dimensions LxWxH75.2 x 44.65 x 1.38 in
Weight52.91 lb
ManufacturerSonali Solar
Manufacturer Part #SS-M-440
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
Warranty15/25 Year See Warranty details
Delivery Time 5-7 business days

About product

SS-M 440 is part of the SS-M Series — one of the most recent made by Sonali Solar. These panels employ cutting-edge technologies to achieve superior efficiency and reliability. SS-M 440 employs monocrystalline silicon — the most efficient material for converting sunlight into electricity. Each of the model's 120 solar cells consists of a single crystal, unlike cheaper polycrystalline cells that are made of multiple crystals melted together. As a result, not only are monocrystalline panels more efficient, but they are also more resistant to degradation. To further boost the performance, Sonali Solar employs half-cut cell technology. Each of the panel’s 120 cells is only half the size of a traditional solar cell. This grants SS-M 440 lower resistive losses and better shade tolerance. At 18.57% efficiency, SS-M 440 offers surprising performance for its weight and size. Sonali Solar paid as much attention to durability as they did to performance. SS-M 440 is guaranteed to retain at least 85.5% of output after 25 years. Product warranty for this panel lasts 12 years.

  • 120 half-cut monocrystalline cells
  • 440 W nameplate capacity
  • 18.57% efficiency
  • 1500 V DC maximum system voltage
  • MC4 connectors
  • 12 year of product and 25 year of performance warranty

More power and efficiency

An already high efficiency of 18.57% is further enhanced by monocrystalline technology. By adding a solid PID resistance and special glass lamination on top, the manufacturer ended up with an efficient and very durable model. Under standard test conditions, SS-M 440 outputs 440 W of power.

Heat-resistant performance

The heat is less of a threat with this module: with one of the lowest temperature coefficients in the industry, SS-M 440 loses just 0.37% of efficiency for every 1.8°F above 77°F.

High quality standards

Sonali Solar strict manufacturing standards include multiple tests to provide extreme quality assurance. The facilities are highly automated, allowing the company to maintain high standards and keep the level of warranty claims very low.

Reliability and degradation resistance

Slow degradation over the next 25 years is guaranteed by Sonali Solar. The performance will decrease no more than 2.5% during the first year and then will be limited to 0.50% annually. Your modules will retain at least 85.5% of original performance after the 25 years are over. This 440 W Sonali Solar solar panel also comes with a generous 12-year product warranty.

A panel that can handle hail, wind and snow

The 1.38" frame made from anodized aluminum and a layer of protective tempered glass make this module resistant to the foulest of weather. The front side of the modules can resist a 5400 Pa load, and the back side 3600 Pa.

75.2" x 44.65" x 1.38"
52.91 lb

Reviews & Questions

  • Reviews (3)
  • Questions (3)
This panel was purchased to operate my big water pump. For this purpose, the 144 cell design with a 34 volt output is simple to connect and produces more than enough power. I would suggest it to anyone searching for compact, high-efficiency solar panels.
Sam Casimaty
08/01/2022 01:21 pm
These Sonali panels' slim size allowed them to fit nicely on our roof. The MC4 connectors are used to link them. Compared to our previous set of panels, which started causing us connection problems, the new panels take up far less space and charge the batteries more quickly.
Richard Heart
07/02/2022 09:01 pm
Placed it on my Jeep's roof to power a battery bank for my refrigerator. has thus far had no trouble maintaining battery power even on days with a lot of cloud cover. really robust. despite taking multiple beatings from branches it keeps working!
Jay Mulvany
05/30/2022 12:20 pm

Leave a review

I thought this brand only made polycrystalline panels. Can you confirm this model is monocrystalline?
Cory Arellano
07/13/2022, 21:13
Yes, Sonali makes monocrystalline panels as well. This model is one of them.
Hey! Could you tell me where these panels are manufactured?
06/29/2022, 19:15
Sonali Solar operates a manufacturing facility in India.
What’s the minimum order for a pickup?
Bernard Lafrenière
05/19/2022, 17:16
At the moment of writing, there’s no minimum order for pickup.


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