Originally Posted by
youwish16
i know how to make them but i dont know about all the numbers. can someone explain?
say i have a charger that charges 4 2s batteries at once at 5 amps each, how would i determine the minimum power needed from a power supply?
Basic equation: Voltage x Amps = Watts
For the case mentioned, including allowance for charger efficiency:
4 lipos x 8.4V full charge x 5A / 80% charger efficiency = 210 watts
Most power supply manufacturers recommend ~30% extra for reliable operation: 273 watts.