I was in a Toyota showroom recently and they had a Prius hybrid with solar panels on the roof, seems the logical thing to do to make use of the roof space, the guy said they only add 1 mile to electric range assuming it’s left outside the office on average 9 hour day
Still if it’s parked outside at home as well I guess it adds up to several hundred miles a year
solar panels have different outputs based on size and number of cells and whether the cells are in parallel or series as one creates voltage and the other creates amps car roof at present is not big enough to make much power, 4 full size panels feed in to a storage area ie 4-8 big truck batteries will store the power made in the day time so when come home from work can use a 240volt car changer to recharge the car off the stored power in the batteries,,, via a invert-er that inverts 24v dc to 230volt ac
A solar panel's output is expressed in watts. On average, a domestic solar panel has a power output of around 265 watts, although it can range anywhere from as little as 225 watts to more than 350 watts. The higher the wattage of a solar panel, the more electricity it can produce under the same conditions.
To calculate how much electricity a solar panel will produce in a day, you simply have to multiply its wattage by the number of sunlight hours. For example, a home in Cambridge with a 280 watt solar panel that receives 4 hours of sunshine will generate 1,120 watt-hours (Wh) or 1.1 kilowatt-hours (kWh) of electricity that day (280 x 4). In contrast, if that same home had a 320 watt solar panel, it would be able to produce 1,280Wh or 1.2kWh of power on that same day (320 x 4).
most cars take 4.000kwh its working out much storage would be needed to run a 6k inverter even if with 4 panels you get a 50% charge in one day most people prob dont use that up anyway,, and its 50% for free after the gear has been paid for,,