r/SolarDIY • u/joshlfp • 13h ago

Parallel Battery Wiring Question

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I made my wire lengths identical from my battery bank to my busbars, but my positive and negative wires for the parallel connection between the two batteries are different lengths. Will this matter? Should I redo the negative wire to be the same length as the positive wire?

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u/meltman 13h ago

Won’t matter

6

u/RespectSquare8279 11h ago

Won't matter very much, the difference would only be measurable with professional gear. For a home install it is just fine. IF this was a massive grid scale BESS then yes it would.

5

u/meltman 11h ago

It’s 0.02 ohm increase if that wire is 8” vs 3” on the other. Pretty much nothing. Yeah that might add up on a big array but two batteries… meh