Answer Posted / m.b.parthasarathy

The formula is as follows.

1. To find battery back up time : Battery AH X Battery volt X constant factor is divided by load(in watts). Perhaps if you have 100ah battery and the load is 500watts you can find back up time as follows.
EX: 1ooAH X 12V X 0.85 / 500
100AH X 10.2 / 500 = 2hrs.

2. To find battery AH : Back up time X load is divided by Battery volt X constant factor.Suppose you need 2hrs back up time with 500watts load, yu can calculate battery AH as follows.
EX: 2 X 500 / 12 X 0.85
1000 / 10.2
= 98.03AH. Commercially available 100AH battery only.

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