Installing a 3rd battery bank - did I knock it up correctly - SailNet Community

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Old 01-18-2011
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Installing a 3rd battery bank - did I knock it up correctly


Two years ago I had to install a 3rd battery bank to feed a new bow thruster. I didn't like the idea to change the running system (and to rearrange two new wires leading from the aft to the bow) so I used the "old" windlass wires to charge the bank#3 and simply installed a battery switch (see circle #1) in between the regulator / isolator and bank#2. First, I thought it was very clever but I'm still a bit concerned about what I've knocked together.

It worked so far without noticeable problems except to the fact that the AmpHour2+ (to monitor the batteries) didn't get any information from bank#3.

I'm thinking about connecting bank#3 with the AmpHour and fixing up a switch (circle #2) to select the bank manually.

My questions:

- Do I run the risk to overcharge the battery if there is no monitor connected?

- Can I do it the way as shown close to circle #2 (manual switch)

- Can I 'merge' the 3 wires in one? (coming from the isolator and regulator respectively running to the starter -> "Anlasser") see circle #1?

- Does it do any harm if I connect the neg wire (circle #3) to bank#2 or does it rather have to go directly to the ground?

Thanks for your advice,

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