Wiring four 6V Batteries--is this the best method?
Increasing the battery bank from a pair of 6v T-105's to four. Below is one possible way (maybe the only way?) to accomplish it: Is this the only (and best) way to connect them?
Forum Discussion
The "load" wires do not have to be the same length or the same R. It is the links between batteries that need to be even for R so the batteries share equally. The load wires do have to be "across" the whole bank for balance. No "downstream" batteries.
The load/charging wires are in a circuit so it is the total R of the Pos and Neg paths that counts. Pos and neg paths can be different such as when the Neg uses the Rv's frame and the Pos uses wires.
You can have a situation where the same wires do both jobs, so they should be even. An inverter with two pos and two neg wires on batts in parallel such as a pair of 12s, can have one of each wire to each side of the pair. That way you don't need any actual parallel links as well as the inverter's wires. Idea being each battery does half the work. In real life you can be close enough and swap batteries around every so often to even their lifespans.
Where you can't get proper balance you can do the same thing. Rotate the batteries in the bank over time to get even wear.
The load/charging wires are in a circuit so it is the total R of the Pos and Neg paths that counts. Pos and neg paths can be different such as when the Neg uses the Rv's frame and the Pos uses wires.
You can have a situation where the same wires do both jobs, so they should be even. An inverter with two pos and two neg wires on batts in parallel such as a pair of 12s, can have one of each wire to each side of the pair. That way you don't need any actual parallel links as well as the inverter's wires. Idea being each battery does half the work. In real life you can be close enough and swap batteries around every so often to even their lifespans.
Where you can't get proper balance you can do the same thing. Rotate the batteries in the bank over time to get even wear.
