Short answer: a portable power station for heater use can run a plug-in space heater, but not for long. How many watts does a space heater use? A standard US plug-in space heater typically draws about 1,500 watts on high. Divide your station's watt-hours by the heater's watts and you get the most hours you could possibly run it. Even a big 3,000 watt-hour unit gives you about two hours of a 1,500-watt heater before losses, and then nothing left for the fridge or phones. So for overnight heat, us