how to calculate the battery Ah? what is the formula.
Answer Posted / ramakrishnan
AH = (VA * Power factor)/(Output Efficiency * Vdc * K)
K is diversity factor
for 30 mins back up 0.9
60 0.5
120 0.3
240 0.2
Efficiency is 0.9
Pqwer factor is 0.9
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