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