Is there a Neg battery cable in trailers?

BFL13 wrote:

I suppose moving the batts inside is to make room on the tongue for the Honda 3000, so in that case, yes you need to find the positive wire that goes from the battery fuse now to the pos battery terminal, and re-route but don't forget to shift the battery fuse too.

No, moving batteries inside not to make room for Honda 3000. Just feel better with my possessions inside. Still thinking in context of fumes in AGM, there is no info, other than theoretical arguments that AGM "could" gas if relief valve fails, or if it's hot and temp compensation of solar controller doesn't work.

Anyway, if I decide to move the batts inside - I had other plans for that 3ft red AWG 8 pigtail dangling at the trailer front. Re-route it inside but connect it not to the battery, but to the Loads - via breaker and Pos bus of the breakers box. (I'm talking about Breakers Enclosure that I'm installing, not any OEM equipment).

Now, the Pos cable for battery would be a separate AWG 4 from the Pos bus of breakers box straight to the battery - with this This Battery Fuse. I have completely forgotten about the existing battery fuse on that OEM AWG 8 pigtail in front of trailer, - I guess I don't need it.

Your 2000w inverter to run your microwave, kettle, toaster, hairdryer, vacuum cleaner, leaf blower, etc can be inside with the batteries, and the batteries for the inverter do not need any ground to the frame from the batteries, just the pos and neg inverter-battery wires (pos wire fused).

You can leave another set of batts on the tongue for the regular rig-running duty.

The solar controller can charge both sets simply by paralleling the two banks with any old jumper cable set that will reach between them.

I suppose moving the batts inside is to make room on the tongue for the Honda 3000, so in that case, yes you need to find the positive wire that goes from the battery fuse now to the pos battery terminal, and re-route but don't forget to shift the battery fuse too.

Oops I forgot Almot is the OP :)

The Negative "Cable" is the frame.. You can bolt to it anywhere.

Yes, this had crossed my mind - if frame Neg were a danger, we would've been dead by now in our cars.

Neg bus near 12V fuse box - sure, but it's far away from the front storage.

Batteries are AGM, not much gassing (I hope).

You won't get shocked from the frame because your little electron buddies travel down the path of least resistance. Most vehicles have negative frame ground and there would be bodies littering our streets if every time someone touched the vehicle chassis, a shocking current was present without a better path to ground. There is also "electrical potential" involved but beyond this discussion.

There is probably a Negative bus near your 12 volt fuse box with a heavy cable from the frame to the negative bus.

Doug

Yes, frame mount the neg cable. Make sure batteries are vented to the outside world and not to any living areas. Most current problems while touching the trailer with wet feet is from 110 not 12 volt. 12 volt should not be a problem at all.