Negative/Ground wire
Our first trailer had both the positive and negative 12 volt wires running from the battery to the combination distribution/converter panel. The negative wire was also grounded to the frame. On the ...
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I used a long length of copper water pipe as a second negative path in parallel with the frame in the 5er we had. Had short wire connection each end to battery neg and DC panel neg lug. It worked great to increase amps from converter to battery.
You don't need to have equal R for neg and pos paths since it is a circuit and the total R is what counts. Reducing R anywhere helps.
The was no "loop effect". Got some "loop effect" in another set-up though where there were several grounds in play, but that was with an inverter that had an internal fault where it was "looping" inside itself. Just paralleling your converter-battery paths to reduce R is ok. (do fuse the second pos path)
You don't need to have equal R for neg and pos paths since it is a circuit and the total R is what counts. Reducing R anywhere helps.
The was no "loop effect". Got some "loop effect" in another set-up though where there were several grounds in play, but that was with an inverter that had an internal fault where it was "looping" inside itself. Just paralleling your converter-battery paths to reduce R is ok. (do fuse the second pos path)
