How to Power a Space Heater ONLY Using Solar Panels. We purchased four used 400 watt solar panels for $50 each for a total of $200. The voltage potential is around 160 volts DC, but with a space heater connected to it at full blast, the voltage drops to around 120 volts DC. The heater becomes very hot, radiating heat into the house. The outdoor temperature can be way below freezing, but as long as the sun is out, the solar panels generate electricity which powers the space heater and heats up the interior of the house for four hours. Now if the solar panels were installed on a solar tracking system, the same setup can generate six hours of heat for a total of 9000 watts, a 50% increase. That will save at least six hours of your heating bill per day for your home.
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