Power Supply Calculations
Power Supply Calculations
(OP)
Hi,
If you have a Power supply, that supplies a load of 15Amps at 13.8VDC, how would you calculate the current on the AC side of the supply (@240V). (this information could help with circuit breaker sizing etc?)
If you have to assume an efficiency for the power supply and a input power factor, lets say 90% efficiency and 0.95 pf.
Thankyou
If you have a Power supply, that supplies a load of 15Amps at 13.8VDC, how would you calculate the current on the AC side of the supply (@240V). (this information could help with circuit breaker sizing etc?)
If you have to assume an efficiency for the power supply and a input power factor, lets say 90% efficiency and 0.95 pf.
Thankyou





RE: Power Supply Calculations
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RE: Power Supply Calculations
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RE: Power Supply Calculations
15Amps at 13.8VDC = 207W
90% efficiency....power on AC side = 230W
P = V*I*pf
230 = 240*I*0.95
I = 1.009A???
Would this we the correct answer?
Sorry Macgyver, this was a discussion I was having with a friend and thought we would get a confirmation.
Thankyou for your responses
RE: Power Supply Calculations
@Camomac, you got it right in the calculation. However, it holds good only for a 1-Ph system as the input. For a 3-Ph system, dont forget to add "Root 3" to the formula.
Fahad Shaikh