Answer / sarath.s

Battery AH/Battery current at full load.


Ex:160/40 amp we get three hours back up

Answer / ishu

battery Ah*nominal dc voltage of system/load in va

Answer / malkhan s chauhan

Idc = Cap. of UPS*1000*PF
-------------------------
Nos. of Cells* ECV* Inverter Efficiency

Answer / manju

Battery capacity X No of battery X Ah X battery(0.8)/ o/p
wattage

this is will give backup time for your setup

Answer / iswar

battery Ah*dc cut off voltage of ups/load(VA)

Answer / bharat g surati

for back up count equation is

no of batteries X 12 volts X battery AH = totalVA

Answer / vinu chauhan

Battery Back Up = Idc*Hr
-------
% of battery utilization

Answer / v.bala

Battery current at full load / Battery Ah. This gives
approxmate backup time.

Answer / kumar

ups capacity = 5kva = 5000va
battery = 10 nos
battery volt = 12v
ups vdc = 10*12 = 120 vdc
ups power factor = 0.8
back-up time = 5000*0.8=4000
ups load = 4000/120
battery ah = 33.3 Ah perhour (appx value)

Answer / harish dhami

its all about d matter of charging and discharging.......
generally all of us r well known about how a capacitor
discharges.....what is d time constant for discharging.
knowing initial n final conditions we may calc. d backup
time with some formulas....

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