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Saturday, November 20, 2010

Temporary House Battery Bank

I installed some old, used batteries (but still considered good by the battery tester) to act as the primary house bank. This gives me something to work with as the electrical bits are planned/designed/installed. A 24 volt battery bank made from an extra 12v battery from my truck, and two 6 volt golf cart batteries (talls) donated by my neighbor across the street. Connecting these batteries in series gives a total of 24 volts. Mind you, this is not a "proper" battery setup, in fact it violates a number of ABYC rules for battery wiring and configuration.

Specifically, you never mix batteries of different capacities, chemistries or age to form a single bank as it creates battery charging problems and tends to reduce the lifespan of ALL batteries in the bank. So kids, don't try this at home. (In this case, I don't care if I shorten the life of these batteries as they were used and had been taking up valuable space in the garage anyway.)

Another part of this exercise is determining the best route for the big cables that lead from the battery box (under the center forward floorboard in the main salon) to the engine room. The initial plan is that the cables will be routed above the floorboards, through 2 inch conduit following the outer inside perimeter of the dinette riser of the main salon.


She:Kon said...

Have you thought about separating the pos & neg cables and running them in smaller conduits straight back to the engine room? I had a run-in with shorted wires this year so am thinking I'll keep the two conductors as separate as possible. Your electrical plan looks well thought out. I may borrow some of that detail for my own project.

Anywho, just a thought.

robert said...

S:K, you know, my wife suggested the same thing. I certainly have room to stack two conduit runs, one on top of the other, and it would not be hard to do so (especially now). I will have to give it some thought.

Anonymous said...

There is a conflicting requirement though: the further you space the conductors apart, the large the electrical field around them. This could influence your magnetic compass and/or fluxgate. So you do want, at least, to keep the conduits together.