I have a 119 Sq Ft house located at 7500 feet in the Rocky Mountains. The house is inhabited sporadically 1-2 weeks a month. I am looking to add a little heat to: -Take the chill off when I am not there -Add capabilities for charging devices and a night light down the road I wanted to bounce this idea off and hopefully get some feedback! Take 1 or 2 solar panels, ~200-400 watts @12v $100-200 and mount it on the roof. Buy an automotive heater with thermostat and hardwire that baby to the panel. Theory: If there is any sun, it will power the heater and do some form of heating during the day, for ~$100-$200. For 119 Sq Ft, it wont take much to heat the place, it is well insulated so hopefully will need less propane/wood heat. I don't want to wire a heater to the batteries and cycle them unnecessarily. Questions: 1. Do you think a 12v electric blower motor would burn up in lower than rated voltage situations? If yes, I can just put a resistor type heater and thermostat in there, although I am thinking it might be fine. 2. Does hard wiring a solar panel have any other negative effects? 3. If I wanted to charge a battery separately for lighting(1 12v led light), but not run the heater off of the thermostat, how could I isolate the circuit to power the heater when there is power from the panel, and charge the batteries at the same time? I understand a charge controller would be needed. I have batteries. I am thinking just wiring the + and - in series with the charge controller wouldn't cause any issues other than both devices sucking power, and therefore limiting the power to both. 4. I would place the heater in a fire-safe location in case it did fry. What about other wiring? Any way to make the setup/wiring more fire safe in case of a short? Will a panel shorted long-term fry\pose a safety hazard? 5. Any other safety issues you can think of? Other Ideas?