I have a Ingersol Rand HP1600WCU compressor with a Cummins QSX15 engine that has a battery charger. A 120vac circuit supplies power to the battery charger.
We are extending these cables and I have to run voltage drop to make sure it's ok.
I can't find the battery charger current draw anywhere. Looked thru the Cummins QSX15 specs and the Ingersol Rand HP1600WCU compressor.
any help?
Please see if I read your problem correctly. You have an engine-driven compressor and you want to transfer its battery away from the engine skid, hence you need to size the cables, right?
It's really simple. Know your battery rating--> AH a.k.a. "ampere-hours".
The standard discharge/charge rate is 8 hours;
A = ampere-hours/8 hours = amperes draw at 8-hr rate! That would be the amperes running from your charger output terminals to the battery, thru the battery cables.
OTOH, if it is the charger that you will be transferring together with the battery, you'll need to convert the DC output amps into AC values by calculating the DC power at 8-hour charging rate.
DC power = amps DC x Volts DC = xxxx watts
AC power = DC watts/ efficiency of charger;take eff= 0.90
AC amps = AC power/120V
Sample problem: car battery Power Patrol SLA1185, 12V, 100AH
Charging amps = 100A-hours/8 hours = 12.5 amperes DC
AC 120V charger amps = [(12.5 x 12)/.90] / 120 VAC = 1.39 amperes AC
Hope that helps!
