BMV 712 Wiring for No Boundaries Camper

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mcaterer asked Apr 5, '24

BMV 712 Wiring for No Boundaries Camper

Hello, I'd like to add a BMV 712 monitor to my camper while I'm upgrading it to 2 12V lithium batteries and a solar suitcase connection in addition to the existing solar setup. I haven't been able to find a wiring diagram for this specific setup so I'd like to double-check.

Currently my battery has 1 positive wire and 3 negative wires connected to the battery terminals. I'm not sure what the 3 negative wires are, but I think they all need to be connected to the load side of the shunt. I'm planning to connect everything in this way. Any help is appreciated. Thank you.

BMV Battery Monitor wiring diagram

screenshot-2024-04-04-at-105716-am.png (144.5 KiB)

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Answer 1 · 2024-04-05T15:27:38Z

pwfarnell answered · Apr 05 at 03:27 PM

The solar negative wire MUST be connected to the load/system side of the shunt NOT the battery negative. The shunt can then count how much charge current comes in from the solar.

Also consider connecting the batteries diagonally, so connect the positive wire from your loads to battery 2 with the solar positive and leave the BMV connected to battery 1, this keeps the battery use more evenly balanced.

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Answer 2 · 2024-04-05T15:55:05Z

mcaterer answered · Apr 05 at 03:55 PM

Thank you for the help. So I think the wiring diagram should actually look like this:

screenshot-2024-04-05-at-115318-am.png (103.8 KiB)

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Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

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