Originally Posted by UKDUDE
Is this a bad idea? I was wondering whether the sealed design of the box was to prevent any hydrogen from escaping inside the RV.
Hydrogen rises, and the battery box is vented to the exterior of the van near the top, but supposedly sealed all around, except for another vent in the bottom to let in fresh air. So if you drill a hole in the side near the bottom, and put a rubber grommet in the drilled hole to protect the wires from chafing, you should be golden.
That leaves the existing vents open to do their job, and avoids the risk of venting hydrogen inside. Not that AGMS give off much hydrogen…
Side note, the battery box is painted steel, so after you drill the hole, paint the fresh edges before you put the grommet in. That will help prevent corrosion.