Supplimental Storage Battery Solar PV Panel This is a sample PV (Photovoltaic) solar panel which we’ve used to test the feasibility of paneling the roof and may hood of the vehicle to allow a fuller charge to the storage battery set. So far, we believe that it help prevent early battery death via a process called sulfination. Cars generally have enough roof area for at least 100 watts of generating power. IE 100 watts X 10 hours of full sunlight would give you 1000 watt hours or 1KWatt hour. That would allow you to run an appliance with a rating of 1000 watts for one hour.