Quote:
Originally Posted by Cassem
Could somebody please invent a block heater that runs off a battery?
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If this is really all you want, all it takes is an inverter. The problem is that it'll drain your battery all the way down. You could use a second battery and an inverter.
I've occasionally used a couple old blankets thrown over the engine compartment as well (basically Frank's idea).
Another, more complicated option would be a heat storage system. It's basically a thermos bottle that you can pump the coolant and/or oil into so it stays warm while the car is sitting.