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Does voltage effect battery charging time?
I made a solar charger to charge a battery pack I made. I understand that charging time is simply a relationship between the battery capacity, and the amperage of the charging source. What I'm not sure about is voltage. Say you have two identical charging sources and battery packs. The only difference is that one source has 1 amp and 12 volts, and the other has 1 amp and 6 volts. There has to be some sort of difference. Will the battery pack be harmed (let's say it is a 6 volt pack) if you're using 12 volts. I'm using a charge controller so it should be fine on that end.
But what if the wattage of charger A is twice that of charger B. This would allow you to have the same amperage but twice the voltage still. To my knowledge, it is amperage that controls charging rate, and that is constant here. The only factor I'm wondering about is voltage, which could vary depending on the wattage of the charge source.
The battery must be supplied a voltage above its terminal voltage. The voltage difference determines the current at which it is charged, and 12 volts across a 6V battery will produce too much current, possibly ruining both the battery and the charger!
The battery/ batteries should have charging voltages/ currents marked on it, or perhaps a data sheet is available with the information.??
Likewise for the solar charger.
It is OK to charge a battery at less than its maximum rate. But you must not exceed it.