To have an idea as to how powerful your charger has to be…
Wattage is calculated by measuring the voltage and amperage of a circuit and then multiplying them together:
Watts = Volts * Amps
If you want to charge a 22000mAh 6s pack at 1C. How many watts does that require? We know the voltage of the battery and the 1C charge rate is 22A.
Watts = 6s * 1C = (25.2V) * (22A) = 544.4W
So the charger will be outputting at most 544.4W. I say most because the voltage of the battery is changing the whole charge cycle. It will likely start in the mid 22V range and will finish at 25.2V. So in order to calculate the max wattage needed, I use the max voltage involved.
My future additional battery pack will be a Tattu 6s 28000mAh x 2 - to charge these in 1C mode and in one hour you would need a charger with ( 6s*1C = 25.2V * 28A= 705.6W ) at least 705.6 watt and 28 A per channel!
In conclusion the wattage plays a crucial role in charging. Don’t forget to take it into account as you choose your charger and power supply.
You can also charge your lipo pack with 0.5C or 0.2C in the case you have a less powerful charger!
It just needs more time…
Don’t forget “NEVER USE THE CHARGER UNSUPERVISED”