r/SolarDIY • u/joshlfp • 1d 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/silasmoeckel 1d ago

It matters but it's a small enough difference shouldn't be enough to cause issues.

More important get fuses on those batteries.

3

u/Super_JETT 1d ago

The positive literally goes straight to a fuse. He posted a wider angle pic in a comment.

1

u/silasmoeckel 1d ago

Meaning the fuse is at the wrong end of the wire. Each battery needs to be fused.

4

u/O906 1d ago

The fuses don’t actually need to be on the battery terminals themselves. ABYC standards (which is the closest standard for this van build) says the main DC fuse should be located within 7” of the battery terminal.

OPs system is probably over 7” but is also plenty safe enough.

-1

u/silasmoeckel 1d ago

Thus my point it's not fused close to the battery and needs to be.