The solar efficiency ratings of SunPower solar panels and Maxeon panels are 16.5% to 22.8% higher than those of the majority of other solar panels on the market right now. Higher energy production and energy savings are associated with high efficiency. The solar panels are still among the best available; they are renowned for their effectiveness and high cost. The M Series, A Series, X Series, and E Series are the four solar panel lines offered by SunPower. Each line is made up of monocrystalline cells and has an efficiency rating of at least 20%.