how to calculate the battery Ah? what is the formula.
Answers were Sorted based on User's Feedback
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.
Is This Answer Correct ? | 160 Yes | 44 No |
Answer / stanley electrician
power factor is not consider in DC side.
Is This Answer Correct ? | 78 Yes | 19 No |
The question is about the battery. The battery had only DC
voltage source.
In dc, no power factor.
Is This Answer Correct ? | 56 Yes | 19 No |
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
Is This Answer Correct ? | 25 Yes | 11 No |
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 .
Is This Answer Correct ? | 4 Yes | 6 No |
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
Is This Answer Correct ? | 28 Yes | 39 No |
Answer / ramakrishnan
i had given the answer for AC UPS Systems not inverter
Is This Answer Correct ? | 12 Yes | 32 No |
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hi friends this is a newcomer in your community of enthusiastic peoples. i am preparing for SSC (CPWD JUNIOE ENGG EXAM FOR ELECTRICAL) pls guide me on the same how to crack it? PLS LET ME KNOW IS ANYONE THERE WHO PASED IT? CAN I GET THE QUESTION PAPERS OF PREVIOUS EXAMINATIONS?
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