In ups how can calculate the battery backup time
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Answer Posted / 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)
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