Second House Bank

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Back to Home ... s/v Stella Blue home ... Battery Page ... Projects

October 2006 --

This is where the old water heater used to be.

I'm going to put a second house bank here instead,
with two more golf cart batteries. It'll help balance the weight on the boat, since the first house bank
is about the same distance away from the centerline
on the starboard side.

The wire to the start motor on the engine runs through here, and the fit was tight.

To avoid chafe I used my Handy Dremel Tool to make a nice soft groove in the shelf,
painted it, then covered the wire with a piece of water hose. It's tied down well
with Ancor wire clips.

 

This shelf is made of some leftover formica topped plywood from the boat. The edges are sealed
with epoxy, and the whole thing painted.

It's screwed into the fiberglass platform, and the screw holes are sealed with some caulk.
At the top edge, there's a hunk of wood attached with epoxy, which will serve as the bottom brace for
a bulkhead that will enclose the area.

 

Speaking of wires -- many people believe that A/B/All switches are "old school" and unsafe, and that multiple banks should be hard wired in parallel with a simple On/Off switch.

Well, I want to be able to isolate the banks if necessary, but do expect them to be in parallel 99 per cent of the time.
I replaced the old A/B/All switch with the biggest one I could get, rated at 600A continuous. What the heck. The battery banks are tied together through it, so having big heavy duty contacts inside the switch is safer.

Here's a link to the "Big Wires" diagram for the boat.

The new bulkhead behind the battery box is made of marine plywood, with a layer of X-Mat Fiberglass
epoxied onto both sides.

The Blue Seas battery box is bolted down.

Since I have used ANL high amperage fuses everywhere, I installed another one here. This'll minimize the number of spare fuses I need to keep on the boat. The fuse holder is less than seven inches from the box.

Note that there's no fuse in it right now. If I buy new batteries for it, I'll need to get new batteries for the other bank as well. The other bank's batteries are about five years old, but seem to be doing just fine. However, you shouldn't mix old and new batteries in parallel, because they won't take the same charge curve and one will end up being undercharged while the other will end up gassing itself to death. So I'll run on one house bank until the next time I need to replace batteries. Right now, I'm not using the boat in a way that requires both banks.