Rob_T
Elite Veteran
Location: Tualatin, OR - USA
| The power going into the charger will be about 20% more than the power going into the battery (that extra 20% is due to inefficiency in the charger and that's what makes the charger get warm!).
Power is volts times amps.
So if you're charging a 6s battery at 4 amps (say), then the power going into the battery is 6 * 4.2 * 4 = 100.8 watts. (number of cells times the voltage per cell times the charge current).
Assuming 20% power loss, you'll have 1.2 * 100.8 = 121 watts going into the charger. With a 12V supply, the charger will take 121 / 12 = 10.1 amps.
If you have two chargers doing this at once, then you'll need double the current rating on your supply.
These numbers aren't exact - but they'll get you looking at the right power supply.
By the way, you may find the charger will list a minimum power supply. Schulze recommend a big supply for their chargers to make sure the voltage doesn't drop as the risk of damaging the charger is greater if the power supply drops (as then the charger becomes less efficient and so gets hotter).
Rob
Eco8, Piccolo Fun, Shogun, HB Elite CP, Trex 450XL CDE, Swift |
