On a 10 KVA UPS we have to provide a DC MCB for Battery bank
of 16 nos (12 V 65 AH).
What Shall be the current rating of DC MCB ?
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Answer Posted / naveen kumar.b
Ans:- 60Amps MCB
how:-
for 16 battery net voltage is 192Vdc.
For battery low cut OFF voltage fixed in by all kind of ups is 10.5 each battery . so for 16 battery System battery low cut of votage is 168VDC
( :- at time low battery voltage only Dc current consumption is high, we need to take maximum current consumtion for select MCB)
total load we taken= 1oKVA Full load.
DC voltage at time low battery = 168
current consume (at time of low batter)= 10000KVA /168Vdc
current consumption is 60Amps arround
so 60Amps MCB is required
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