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MAXEON 3 | 400W

Sunpower Maxeon 400W

Fundamentally Different. And Better.

Your solar panel choice matters.

Maximise your savings and enjoy the peace of mind that comes with solar’s top durability, reliability and efficiency, all backed by the industry’s leading warranty.

Record-setting SunPower Maxeon panels ensure that you have the very best solar for your home or business.

Fundamentally different, and Better.

SunPower Maxeon panels combine the top efficiency, durability and warranty available in the market today, resulting in more long-term energy and savings.

Maximum power

high efficiency solar panel maxeon rooftop comparison
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Industry-leading efficiency means more power and savings per available space. With fewer panels required, less is truly more.

As the most efficient solar panel in the industry for more than 10 years, SunPower Maxeon panels generate more power from the same roof than conventional panels, delivering up to 35% more energy from the same space over the first 25 years.

Highest Lifetime Energy and Savings

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Designed to deliver 55% more energy in the same space over 25 years in real-world conditions like partial shade and high temperatures.

The patented metal foundation of SunPower Maxeon cells allows them to bend under tough conditions where others break. And SunPower Maxeon panels are proven, with an expected useful life of 40 years1 and a return rate of less than 0.005% on over 15 million panels shipped and studied

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Better Reliability, Better Warranty

25-year Complete Confidence panel warranty

With more than 25 million panels deployed around the world, SunPower technology is proven to last.

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That’s why we stand behind our panel with an exceptional 25-year Combined Power and Product Warranty, including the highest Power Warranty in solar.

All SunPower residential and commercial panels are backed by the industry-leading 25-year coverage of the SunPower Complete Confidence panel warranty. Each panel is manufactured with the absolute confidence to deliver more energy, reliability and savings over time—and reinforced by extensive third-party testing and field data from more than 35 million panels deployed worldwide to ensure you get the best warranty available and complete peace of mind.

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Third-party Reliability Validation

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SunPower Maxeon panels were recognized as a Top Performer in the 2021 PVEL PV Module Reliability Scorecard.

Based on data from its Product Qualification Program (PQP), the PVEL Scorecard highlights the exemplary reliability performance of solar panel manufacturers worldwide.

SunPower Maxeon Cells

maxeon solar cell diagram

No grid lines

SunPower Maxeon cells use back-contact conductivity, eliminating unsightly metal gridlines, and enabling them to absorb more sunlight.

Solid metal backing

Metal adds massive strength to each cell, helping it resist corrosion from the elements, while making the entire panel more durable.

Thick connectors

Expanding and contracting from daily temperature swings are no problem with our built-in strain relief and thick, triple-redundant connectors.


SunPower Maxeon panels provide greater peace of mind than Conventional Solar Panels.

SunPower Maxeon panels lead the solar industry in panel efficiency and deliver more bill savings by generating the most solar power and long-term solar energy in a given amount of roof space. That means they generate more power in the same space than all other panels on the market. In fact, the SunPower Maxeon 3 panel was the first 400 watt solar panel in European and Australian home solar, where most Conventional Panels are rated for 280 – 310 watts.

Over time, the advantage grows, because SunPower Maxeon panels also have the lowest degradation rate in the solar industry. While most Conventional Panels tend to degrade around 0.75%/year, SunPower Maxeon panels have proven to degrade at less than one-third of that rate, or about 0.2%/year. To translate into real results – that means a SunPower Maxeon panel delivers up to 25% more energy in its first year of operation. In year 25, that advantage grows to about 45% more energy, for an average of 35% more energy during the first 25 years.

SunPower Maxeon panels also deliver greater peace of mind, having earned the trust of experts by being more reliable and durable—and backed by our industry-leading Complete Confidence Warranty. Not only is this warranty stronger, but unlike most conventional warranties, it is based on actual field-testing data. For example, the power warranty promises no more than a 0.25%/ year power drop – the strongest power warranty in solar. This is backed by a study of more than 230MW across 149 actual global sites using a methodology developed in collaboration with NREL. We also know from actual field data that only 0.005% or 1 in 20,000 SunPower Maxeon panels have been returned under warranty. Lastly, SunPower Maxeon panels are built with our customers in mind, which means higher sustainability standards and more elegant design aesthetics than Conventional Panels. SunPower Maxeon panels have pioneered sustainability efforts in solar manufacturing, and have been recognized with the prestigious Cradle to Cradle Certified™ designation for direct current (DC) panels. The Cradle to Cradle designation demonstrates the products’ quality based on rankings of material health, material reutilization, renewable energy use, water stewardship, and social fairness.

SunPower Maxeon panels were also the first and only solar panel to disclose its ingredients through the Declare label – available for all Maxeon 2 and 3 panels. In March 2020, our Mexicali, Mexico manufacturing facility was re-certified by NSF Sustainability as Zero Waste to Landfill – and remains the only solar panel manufacturing facility to achieve this. The certification means that this facility diverts more than 99% of its waste, with 1% or less going to landfills.

The back-contact cell design of SunPower Maxeon panels also delivers an uncluttered and elegant design aesthetic – with panels available in black and white backsheets. This has made SunPower Maxeon panels the panel of choice for architects and designers.

SunPower Performance solar panels utilize high efficiency mono PERC cells to deliver higher reliability and efficiency than Conventional Cells. For more information on Performance Panels, visit the Performance panels page.

The SunPower Maxeon panel advantage begins with its cell. The SunPower Maxeon cell is a fundamentally different design from any other cell on the market, starting with a solid copper foundation that is unique in the solar industry.

In contrast, what appears to be metal on the front and back of a Conventional Cell is actually conductive paste made of tiny bits of silver and aluminum baked onto the silicon wafer. In fact, the process of making those cells is very similar to screen-printing a design on a tee-shirt: you create a template, wipe the paint across the template and then remove the template to leave the paint where you want it on the tee-shirt, and then bake the tee-shirt to cure the paint onto the fabric. A similar screen-printing process is used to apply the thin lines of metal paste on the front, and the full-coverage metal paste on the back, to create a Conventional Solar Cell. Unlike the strength of the solid copper foundation of the SunPower Maxeon cell, the metal paste of the Conventional Cell offers almost no strength to the thin silicon wafer. This fundamental design difference creates the weakness you can find through basic laboratory testing.

A SunPower Maxeon solar panel delivers up to 25% more energy than a Conventional Panel in its first year of operation. In year 25, the difference would grow to about 45% more energy, for an average of 35% more energy during the first 25 years. SunPower Maxeon solar panels are predicted to have a useful life of more than 40 years.

With solar, as with many things, “you get what you pay for.” Not all solar systems are alike. The quality of the technology matters in the long run. The durability, reliability and efficiency of solar panels can vary widely by manufacturer. If you settle for Conventional Panels that might cost less out-of-pocket, you can expect to see average (or below average) results and less savings over time.

A higher quality panel like SunPower Maxeon might cost a little more up front, but you will see more predictable performance in the long run. SunPower Maxeon panels generate more energy, last longer, are backed by a stronger warranty, and are produced more sustainably than Conventional Panels. This means SunPower Maxeon panels will offset more of your electricity bill, saving you more, and do so with the peace of mind you expect from a top-quality product.


SPR-MAX3-400 SPR-MAX3-395 SPR-MAX3-390
Nom. Power (Pnom) 400 W 395 W 390 W
Power Tolerance +5/0% +5/0% +5/0%
Panel Efficiency 22.6% 22.3% 22.1%
Rated Voltage (Vmpp) 65.8V 65.1V 64.5V
Rated Current (Impp) 6.08V 6.07V 6.05V
Open-Circuit Voltage (Voc) 75.6V 75.4V 75.3V
Short-Circuit Current (Isc) 6.58 A 6.56 A 6.55 A
Max. System Voltage 1000 V IEC
Maximum Series Fuse 20 A
Power Temp Coef. −0.29% / °C
Voltage Temp Coef. −176.8 mV / °C
Current Temp Coef. 2.9 mA /°C
Temperature −40°C to +85°C
Impact Resistance 25 mm diameter hail at 23 m/s
Solar Cells 104 Monocrystalline Maxeon Gen III
Tempered Glass High-transmission tempered antireflective
Junction Box IP-68, Staubli (MC4), 3 bypass diodes
Weight 19 kg
Max. Load Wind: 2400 Pa, 244 kg/m front & back – Snow: 5400 Pa, 550 kg/m front
Frame Class 1 black anodised (highest AAMA rating)
Standard Tests IEC 61215, IEC 61730
quality Management Certs ISO 9001:2015, ISO 14001:2015
EHS Compliance RoHS (Pending), OHSAS 18001:2007, lead free, REACH SVHC-163 (Pending)
Sustainability Cradle to Cradle CertifiedTM
Ammonia Test IEC 62716 (Pending)
Desert Test MIL-STD-810G
Salt Spray Test IEC 61701 (maximum severity)
PID Test 1000 V: IEC 62804
Available Listings TUV

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