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post #1 of 5 Old 07-22-2009 Thread Starter
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Ground connections / monitor shunt installation

I've ordered a Xantrex Link battery monitor system. I know I need to install a shunt to measure the current. I was told this normally goes on the ground side just before the batteries. My question do I attach all 7 ground wires to a single shunt? Currently I have two batteries with four ground wires coming into each battery and a jumper between them. My plan is convert this to a single bank so all grounds need to go into one battery, with a single jumper going to the other battery. However I'm not sure it's possible to connect 7 wires to a single post on the shunt, most of which are 2/0 wire.

Currently the grounds coming into battery 1 are...

Main engine block
Charger / Inverter
Generator starter motor

Battery 2 has...

Main panel
Bilge pump

Can the Xantrex shut accommodate this many connections? How should I approach this?
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post #2 of 5 Old 07-22-2009
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ABYC code calls for a maximum of 4 connections to a battery post. With the four wires on each battery plus a jumper, you're already non-compliant :-) IMHO, this is too many...I prefer one, or at most, two.

You need a ground bus. Get one of the Blue Sea Systems bus bars (West Marine carries them), and get a healthy sized one...don't skimp here, as grounds are very important.

Connect the shunt between the battery negative post and the bus bar. Connect all other grounds to the buss bar.


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post #3 of 5 Old 07-22-2009
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Get one that can handle all the amperage you're gonna throw at it and then some.
Jamestown distribuing has a good selection.
Blue Sea Systems Minibus 100 AMP Common Busbar

No longer posting. Reach me by PM!
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post #4 of 5 Old 07-22-2009 Thread Starter
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All I can say is - duh...I should have thought of that.

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post #5 of 5 Old 07-22-2009
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Great advise from the guys. I have my system wired with a bus bar like the one they recommend. It simplifies everything when you don't have too many wires on a terminal. With the shunt between the bus bar and the batteries, you can monitor all of the flow in and out of the battery bank.

I relied heavily on Nigel Calder's "Boatowner's Mechanical & Electrical Manual", when I added a larger charger, inverter and batteries to my boat. If you don't have a copy, I highly recommend it.

Herb DuBois
Beneteau 36CC
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