Maybe a dumb idea, but can I just put a PV panel on my roof and run wires into a room to a power resistor to generate heat? I have just one room that I was thinking of adding this additional heat to. I suppose I could prototype the idea by running a heater of the desired wattage (maybe 200 watts on average) and seeing if it makes much of a difference in the temp of the room. But I dont see anyone who has done this on the web. Also, you would want to maximize the power transfer from the PV to the power resistor, so that suggests trying to figure out the resistance of the panel and supply lines and trying to match your power resistor to that same resistance?