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1) How to calculate battery backup for ups as well as solar
with complete formula elaborately......

Answers were Sorted based on User's Feedback



1) How to calculate battery backup for ups as well as solar with complete formula elaborately........

Answer / kuzhali

ups back up time=(AH rating*volt*power factor)/total load

Is This Answer Correct ?    1 Yes 0 No

1) How to calculate battery backup for ups as well as solar with complete formula elaborately........

Answer / velmurugan, so/d, barcf, kalpa

Consider the 2 KVA online UPS.
specifications are as follows: output voltage: 230V, Pf:
0.8, Load is 1600W. DC bus voltage is 96V.

Now Total output is = 2000 VA
PF of the load is = 0.8
There fore output in watts = 2000x0.8= 1600W.
Efficiency of the inverter is 80% therefore power input to
the inverter will be = 1600/0.8= 2000W
DC current of the inverter section= Watts / Voltage
Consider the fully charged voltage = 13.5X8=108V
The DC bus voltage
up to which the battery can deliver= 10.5x8=84 Volts.

therefore maximum current drawn by the inverter when battery
is in line = 2000/84=23.8A

Now consider the backup required for the load, i.e 1 hour
back up is required to safe shutdown loads when power supply
is not available.

Consider a class 10 type of battery where it has a
efficiency of 90%, 300Ah battery.

the effective AH available for the load is 300x0.9=270AH.
For 1 hour duration the discharge current will be 27.0A
which is higher than the required value of 23.5A.

There fore for 2 KVA online UPS having the load of 1600W
with 0.8 pf load, it requires 300AH of 8 nos of battery for
1 hour backup.

Is This Answer Correct ?    0 Yes 2 No

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