Chargeing 4s packs will be determined by the charger because even though the output is 16+ volts they will still operate at an input of 11-15 usually.

It looks like it's a max of 360 watts so you would nbeed a 360+ watt ps (400 would be minimum I'd suggest)

Figuring it backwards to get current 360/12 volts = 30 amps.