We have a small 200w electric heater, from lasko called a "my heat" personal space heater
designed for desk or cubicle use
October 2012 during our return from the Midwest, I would run it at night in the bedroom, outside temps in the mid 40s, draws 18~19 amps from batteries using the inverter
Since we were driving several hundred miles a day, there was no problem with the battery bank
Since then I have used it a few times to warm my desk area while on the computer late at night, but only for an hour or two
(The Oly Cat was facing the bedroom for DW),
But I could not do eight hours per night using solar only charging
