Join Date: Nov 2008
Location: Deale, MD
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Re: Inverter for hot water tank
Another way to look at it:
A typical deep cycle battery can store about 1.800 kw-hr of energy or about 6100 BTUs. However, only 40% of this safely useable, so about 2440 BTUs.
Warming 10 gallons from 65-105F takes about 3300 BTUs.
Thus, each shower would flatten about 1 1/2 batteries. Different showers and different batteries change the calculation.
Batteries just don't store that much energy, not like liquid fuels (130,000 btus/gallon for diesel). Only a fraction of an ounce of fuel per charge cycle, the challenge of electric drive.
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