Originally Posted by Fordplay
I just bought 2 ICE chargers. I need to know how big of a power supply I am going to need to run both of them. They go to 10 amps each so should I get a 20-30 amp?
Do you plan on charging with both chargers at 10 amps??
Even so, its a function of watts. If you did charge at 10 amps and both batteries were peaking at the same time at say around 9.3 volts
9.3 volts times 10 amps = 93 watts
93 watts times 2= total wattage of 186.
NOW, divide that wattage by the voltage output of the powersupply to obtain the current draw(amps) being pulled from the power supply.
Therefore, 186/12= 15.5 amps.
It is unrealistic to charge with both chargers at the same time at 10 amps, as most people don't charge that high. I recommend 6-7 volts for optimum performance and life of the battery.
So, using the same calculation;
7 amps at 9.3 volts =84 watts, times 2= 168 watts
168/12= 14 amps from the power supply.
I have a 14 amps PS and I routinely charge two packs at the same time with no problems. (Charging at 6-7 amps with both, sometimes even higher.)
PS: most power supplies put out around 13.8 volts, so the amp draw is even less at the power supply.