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Old 01-22-2020, 08:54 AM   #1
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2017 30' Classic
Merriam , KS
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Victron BMV-712 Shunt Wiring in Battery Box

I am installing a Victron BMV-712 shunt in a waterproof box inside the battery box on the front of the Airstream. I wired the shunt to one of the negatives that had a wire going into the trailer, along with the solar charger port wire. I then noticed that the terminal on the other battery also has a wire disappearing into the trailer.

After reading here, it sounds like one goes to the inverter (this is the one I connected to), and the other goes to the 12v system. I noticed the BMV doesn't pick up on the amps going into the batteries when charging (reads 0 amps).

My question: can I move both of those negative battery wires connected to the negative terminals TOGETHER on the load side of the shunt?

I will be using 2awg from the battery side of the shunt to the negative terminal, and replacing the relatively small (6awg?) wire connecting the two negative terminals with a 2awg.
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Old 01-22-2020, 09:12 AM   #2
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2018 25' International
Slidell , Louisiana
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Yes you can do that. You needn't replace the 6awg unless you have or are planning to upgrade to an inverter larger than 1000W, but I can see your reasoning in doing so since you are already doing some wiring upgrades.
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Old 01-22-2020, 09:22 AM   #3
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NCR , Ontario
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we replaced the stock battery with BB Lion
we then moved the lion battery inside under the bed , as the lion DO NOT gas out.

That way all the equipment stays safe, nice and dry

as long as the BMV is in series with -ve of the battery. There should be NO other connection between the battery and the BMV. That way , all current flows through the BMV.

It wired that way, all should be reading fine.

This is our schmatic
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Old 01-22-2020, 09:24 AM   #4
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2017 30' Classic
Merriam , KS
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Thanks for the confirmation.

I have the 2awg on hand. And although not ready to upgrade the inverter yet, it's definitely in a future phase toward solar.
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Old 01-23-2020, 06:10 AM   #5
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2019 28' Flying Cloud
Dripping Springs , Texas
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I'm also interested in installing the battery monitor near the battery box. Dry enclosures are easy to find at big box stores. Please post some pics once you get it done.
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