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You are building an off grid house fitted with solar panels and a battery bank. The house operates at 120V and uses 20kWh of energy

You are building an off grid house fitted with solar panels and a battery bank. The house operates at 120V and uses 20kWh of energy per day. The battery needs to be able to store an entire day of electricity. What should be the capacity of the battery in Ah? Assume the battery has a round trip efficiency of 87%

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