https://commons.wikimedia.org/wiki/File:NREL_PV_Cell_Record_Efficiency_Chart.png#/media/File:NREL_PV_Cell_Record_Efficiency_Chart.png https://commons.wikimedia.

https://commons.wikimedia.org/wiki/File:NREL_PV_Cell_Record_Efficiency_Chart.png#/media/File:NREL_PV_Cell_Record_Efficiency_Chart.png https://commons.wikimedia.org/wiki/File:NREL_PV_Cell_Record_... This graphic of photovoltaic cell efficiency (non-thermo) is super interesting: it shows the progression from 1976 and current capabilities (and not necessarily commercially viable or available). The panels you'll get for your home are probably around 20% efficient in ideal conditions.