Answer / pavan

Part -I:

400Ah Battery means the battery can supply a DC load of 400
Amps for a duration of 1 Hour until the battery gets fully
discharged. so if you are using the battery to supply the
above mentioned load of 20 Amps the battery can work for
400/20 = 20 Hours. provided the 20Amps is a Direct load
connected to the Battery. if you use the battery for a
inverter or UPS to suplly an AC load of 20 Amps. then the
duration is different.

Part - II:

For charging any battery we have to provide a voltage that
is slightly (5% - 10%) higher than the Battery terminal
voltage. The duration of charging can be known by the same
process as above. A 400Ah gets charged in 1 Hour provided
the charging source is capable of supplying 400 Amps to the
Battery. But normally the current of the charging source
will be limited to a lesser finite value. so if you can
know the maximum load the source can supply you can easily
calculate the duration required for the battery to get
fully charged.

Answer / dharmendra kumar gautam

20hours for fully charged of 400ah battery bank

Answer / suyog

if we connected many cells (24) of 200Ah then how i calculate its back up for 10Amp load

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