Answer Posted / sathiyanarayanan

backup formula= KVA/DC LOW *POWER FACTOR

FOR EX:2 KVA/120 DC VOLT(SYSTEM VOLT)OUR MAINTAINED POWER

FACTOR (0.8 P.F),PER BATTERY=12V(DC LOW=10.8),HERE USING THE

SYSTEM VOLT=120V SO,10 BATTERIES-10*12=120V


DERIVATION : 2000/108*0.8

AH=14.81(APP.17 AH BATTERY) given 30 minutes backup

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