Limited stock

JA Solar 445W Solar Panel 156 Cell JAM78S10-445/MR Clearance

$224^.28

(86 ratings)

Q&A

SpecificationCompareSee all
Rated Power Output 445 W
Voltage (VOC)53.31V
Number of cells156
Cell TypeMonocrystalline
Attachments
Return policy
Datasheet

Customer reviews & Questions

Verified buyer reviews

Reviews (86)
Questions (3)

john

09/18/2025

Nice sturdy panel little heavy though

Roberto

12/29/2024

Very impressed these 445W panels are worth it.

Edward Hale

09/07/2025

Can I pair with Enphase IQ8

A1 SolarStore

Many IQ8 models support it — check your specific model ratings.

Lionel

04/11/2025

OK if I mix with other watt sizes ?

A1 SolarStore

Mixing works but isn’t ideal — it may lower your array’s overall efficiency.

joe

03/19/2025

can these be used on an RV

A1 SolarStore

It’s too large for most RV setups; smaller panels fit better.

Specification

Length	85.83in
Width	39.21in
Rated Power Output	445 W
Voltage (VOC)	53.31V
Maximum String Voltage	1000/1500V
Number of cells	156
Cell Type	Monocrystalline
Rated Efficiency	20.5%
Connector Type	QC 4.10(1000V) or QC 4.10-35(1500V)
Frame Color	silver
Dimensions LxWxH	85.83 x 39.21 x 1.57 in
Weight	54.23 lbs
Pallet Qty	27
Manufacturer	JA Solar
Manufacturer Part #	JAM78S10-445/MR
Operating Temperatures	−40°F to +185°F
Scope of Application	Solar Panels for Boats Solar Panels for Home Solar Panels for RV
Use	Commercial Grid-Tie Off-Grid Residential
Warranty	12-year product warranty and 25-year linear power output warranty

More JA Solar products

JA Solar 440W Solar Panel 156 Cell JAM78S10-440/MR Clearance

Delivery on Dec 01–04

JA Solar 535W Solar Panel 144 Cell Bifacial JAM72D30-535/MB Clearance

Delivery on Dec 01–04

FAQ

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%.

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

Close-wattage solar panels

JA Solar 440W Solar Panel 156 Cell JAM78S10-440/MR Clearance

Delivery on Dec 01–04

About product

JAM78S10-440/MR is a model that uses a number of technologies to bring durability and performance to the next level. This panel takes full advantage of the Passivated Emitter Rear Contact (PERC) technology that allows it to capture up to 12% more energy. All thanks to a reflective layer on the back. This design maximizes the number of photons absorbed by solar cells.

The use of half-cut cell technology is an additional perk. The solar cells of JAM78S10-440/MR are half the size of those found in standard panels. Major advantages include reduced power consumption, extended life, and enhanced efficiency in low-light conditions. Given its size and weight, JAM78S10-440/MR efficiency of 20.3% is quite impressive.

156 half-cut PERC cells
440 W nameplate capacity
20.3% efficiency
1000/1500 V DC maximum system voltage
QC 4.10(1000V) or QC 4.10-35(1500V) connectors
12-year product warranty and 25-year linear power output warranty

Increased power and efficiency

PERC technology improves on an already high efficiency of 20.3 percent. The manufacturer created an efficient and highly durable model by adding a robust PID resistance and unique glass lamination on top. JAM78S10-440/MR produces 440 W of power under standard test conditions.

Better performance at high temperatures

An Excellent temperature coefficient means more energy as the temperature rises. Every 1.8°F hike above 77°F will decrease your panel’s efficiency by only -0.35%.

High-quality standards

JA Solar's 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.

Enhanced frame design

JAM78S10-440/MR design makes it ideal for residential and commercial rooftops. Strong 1.57" frame made from anodized aluminum alloy increases durability and strength. The model can support a heavy snow load up to 5400 Pa. The back of the panel can handle 2400 Pa, ensuring that your system will survive the strongest of winds.