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SunPower Maxeon solar panels are designed to be different, and proven to be better across more than five cell generations, 3.5 billion cells and 30 million panels, even in the harshest of conditions. SunPower MAXEON 3 panels combine the top efficiency, durability and warranty available in the market today, resulting in more long-term energy and savings. SunPower Maxeon3 400W panel combines high efficiency with strong durability. Advantages. The SunPower Performance Series is the most deployed shingled solar panel in the world,3 with proven results. With the world's first 400+ watt solar panels , the A-Series solar panels deliver the most power per square foot possible, so you can save more while using less space. SunPower’s Maxeon 3 400w panel offers high generation for both residential & commercial roofs. SunPower 400 W, 22.6% efficient, compared to a Conventional Panel on same-sized arrays (280 W multi, 17% efficient, approx. 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