I am trying to size a cable that will charge a boat battery that is being towed on a trailer from a truck battery. I have looked at a few calculators and they seem to be focused on getting the correct AWG given a length, voltage drop and supplied current. It seems to me, in my case, I do not have a current generator as a supply so isn't the correct question then "How much current will go through a wire of X AWG and Y length that will result in Z voltage drop"? Isn't it true that the alternator will not supply a steady current but will supply the amount of current the battery will accept at the voltage output of the alternator?
If I am correct, how do I calculate what size wire I need, given a length of wire required and an acceptable voltage drop?
Thanks for your help sorting out my confusion!
If I am correct, how do I calculate what size wire I need, given a length of wire required and an acceptable voltage drop?
Thanks for your help sorting out my confusion!