Re: 1000 watt crankcase heater???

Posted by BarnyardEngineering on February 06, 2018 at 05:48:03 from (173.186.244.244):

In Reply to: 1000 watt crankcase heater??? posted by Greg1959 on February 05, 2018 at 17:59:10:

A good rule of thumb is to multiply the amp draw by 10 to get a rough idea of how many Amps the inverter will be drawing from the batteries.

You would need a LOT of batteries to effectively run this heater off an inverter. To run your heater for 1 hour, you would need a minimum of 83 Amp-hours of capacity, and that would drain the battery flat dead. This is HARD on starting batteries, so you'd want to use deep cycle or golf cart batteries. Here again though you don't want to draw them flat dead, generally only down to 50% capacity, so you'd need at least twice as much capacity as you think you need to run the inverters.

Golf cart batteries are about 100 Amp-hours in capacity, but are only 6 Volts. You'd need 4 of them configured to provide 200 Amp-hours and 12 Volts, MINIMUM, for this to run the heater for 1 hour. Then you need to charge them back up, which means either plugging in or running the coach for SEVERAL hours. This is not something you'd want to do to just move the coach across the yard.

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