You pay a premium for SunPower solar panels because they are one of the most efficient panels on the market.
The company’s Maxeon range, for example, was the first commercially available solar panel to reach 400 W – most high-end solar panels reach around 350 W.
You also get SunPower’s 40-year warranty, which is one of the longest warranties available for solar panels. However, this warranty is only available with its Maxeon solar panel range – otherwise it’s the standard 25-year warranty.