Answer / stanley electrician

AH = Amps x hours.
If we use 15A from a battery of 1000AH, then we use upto
66 hours. (i.e., 66x15= 990 ). Th duration of usage is
decreased according to high amps.

Answer / stanley electrician

power factor is not consider in DC side.

Answer / stanley electrician

The question is about the battery. The battery had only DC
voltage source.
In dc, no power factor.

Answer / balaji

ampere hour = ampere rating*no. of hours

Answer / saleem

If u dont know the AH of the battery and u want to check
the name plate detail i think following procedure is
correct.

Connect some load up to batter get dry.and found.
How many Amps(A) load u hav given and how much time it
carried (In Hrs).
A*H=AH of the battery

Answer / muthu

Ampers*Hours

Answer / sandeep mulik

wattage X 20% then divde by lowest volage of battery say 12v
is 10.4 or 10.5 then multiply by no of batteries i.e ( dc bus )

e.g 700 watt x 20% = 840 watts.

then lowest battery voltage is 10.5 assume dc bus is 36 v
means 3 nos battery then , 10.5 X 3 = 31.5

now , 840 / 31.5 = 26.66 amp per hour so use 26 amp battery
X 3nos for 1 kva online ups will give 1 hour backup.

if you want for 2 hrs then , 26.66 X 2 = 53.33 ah , you will
require 60 ah battery for backup of 2hrs .

Answer / vikram rana

va*power factor/vdc*k*efficiency

Answer / ramakrishnan

AH = (VA * Power factor)/(Output Efficiency * Vdc * K)

K is diversity factor
for 30 mins back up 0.9
60 0.5
120 0.3
240 0.2

Efficiency is 0.9
Pqwer factor is 0.9

Any doubt about UPS contact
98409 92005

Answer / ramakrishnan

i had given the answer for AC UPS Systems not inverter

bsec exam syllabus (mis)

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