Answer / kiran

As battery rating given as 400AH, means 20A*20H or 2A*200H
or 40A* 10H like that u can multiply in any proportion
based on the hours.

As the load is given as 20 amps,so it gives battery back
up of 20 hours,which means 20*20=400AH and battery charging
depends on the battery depth and its efficiency to
charge.........

any suggestions or coments regarding to this answer are
welcome......

Answer / abhishek goyal

We need information about voltage level or range.
if voltage is high so that current is less in other
condition it will reverse.

We can calculate if know about the voltage , current and
load etc.
P=VI (KVA)

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