Quote:
Originally Posted by ConnieKat
Hey guys,
Suggestions and/ or thoughts on this would be very much appreciated!
Thanks,
ConnieKat
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Here's why it's tough to do.....
Let's say a typical small portable electric heater is 1200-1500 watts....
Using 1200W for easy math it would draw 10 amps of current at 120V or 100 amps at 12V. 120V x 10A=1200W 12V x 100A =1200W
Assuming that you have a pair of 4D house batteries (that's a nice setup with a couple of large batteries) ....and they are rated at 200 amp-hours (AH) each.....so 400 AH total.
Lead acid batteries don't like to be discharged past about 50% state of charge (SOC) .......so if you draw your pair of 4D batteries down 50% you've consumed half of your 400 AH, so 200 AH.
So the heater consumes 100 amps at 12V when it's running, and you've got 200AH of energy.
200 amp-hrs/100 amps = 2 hours
..so running the small 1200W electric heater will drain a fairly large battery bank in 2 hours..not very practical.
It's actually a bit worse than this when you add the inefficiencies of the inverter.......