Passage 42-- third house battery
Ted, I saw your earlier posting asking about adding a third 8D battery on a Passage 42. I did exactly that, and located it under the aft bunk. It fit perfectly just underneath and forward of the rudder quadrant. Since I used a gel cell battery, there was no need to enclose the battery in a box. I am not near my boat, and cannot recall exactly how I made the little support box for it, but I do remember the basic outline of it. I think I used 2X4 pieces, and through bolted one along the fiberlass support cross-member that sits athwartship just forward of the rudder quadrant. I also put some just along the toe of the battery's outside dimensions to hold it horizontally in place. All pieces were through-bolted. I then put eye-bolts on either side of that space, securing them to the fiberglass support cross-members located at the access points just at the bottom of the lazarettes that are visible in that rudder quadrant area. That allows me to secure a strap along the top of the battery to hold it in place in the event of a knockdown or rollover.I then ran a 3-0 cable to one of the two batteries in the engine compartment. All three 8D batteries are connected in parallel with 3-0 cables, and I run them as a single battery bank. It has worked well for years. It makes it a bit more difficult to change out the batteries, but considering how seldom that is done, it's no big deal.Good luck.