Hi there, I am planning on living in my vehicle next winter in New England. I will have a solar array atop my vehicle, and hoping to utilize an electric heater to minimize my need for fossil fuels. Obviously I need a heater that will produce a substantial amount of heat for ~7 hours. I will have 2, 300W mono panels with a 480AH, 12v battery bank. Can anyone help me to identify if there is a high BTU heater available that could be powered via my solar setup? Thank you!