Sadly many just waste the extra voltage. You’re better of with a single cell P60 and three spare batteries for longer run time. At one of the cabins we camp at, its power is limited to a single solar panel. This keeps an AGM trolling battery charged. It lights the cabin on 12 volt system plus a little 200 watt inverted. That battery alone can charge items for a long time and be recharged on a car. Might be an idea for long power outages.