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texascharlie avatar image
texascharlie asked

BMV-712 - seems dead. Suggestions before I return it?

[Solved: Replacing the 1A inline fuse got the BMV working again. The fuse looked fine to my eye, but it clearly wasn't. I might have found the culprit, see picture.]


Today I tried to do a "pretty" install of my BMV-712 and it stopped working. Making it pretty meant cutting the cable that came with the BMV and crimping a new terminator, so I could route the cable out of sight.

On my first try the BMV worked fine, but I had to re-cut and re-crimp to get the cable through another small hole that I had overlooked.

At that point the BMV stopped working.

The cable is pinned out identically on both ends - blue/orange/green/gr-white/or-white/bl-white. I've re-crimped new terminators multiple times, same result. I've tested two different home-made cables, same result. Should there be a cross-over in the cable?

I've confirmed that the lead coming off the shunt has power, but was a little surprised that it showed 10.76V whereas testing the shunt directly shows 13.40. If I disconnect the UTP cable from the BMV, the lead off of the shunt reads 0.00.

Any thought before I get a replacement BMV?


BMV Battery Monitor
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wkirby avatar image wkirby ♦♦ commented ·

Did you check the inline fuse in the red wire between the shunt and battery positive?

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nigelfxs avatar image nigelfxs commented ·

I've confirmed that the lead coming off the shunt has power, but was a little surprised that it showed 10.76V whereas testing the shunt directly shows 13.40.

The "power" lead coming off the shunt should have the same voltage as measured between battery ground and the shunt. I would try replacing the fuse with a new 1A fuse.

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2 Answers
michelg avatar image
michelg answered ·


mvader (Victron Energy)
answered · May 06 at 11:15 AM EXPERT ANSWER


Hi @PMarine, we designed and tested for the cable length that comes with the BMV: 10 meters. Thats the official answer: max length 10 meter.

A longer cable might work, or might not. Or it can depend on the amount of interference, longer cable will have more interference. Another possible is issue is more voltage drop, so less accurate voltage reading.



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klim8skeptic avatar image
klim8skeptic answered ·

Myself, I would replace the cable,, before replacing the whole BMV unit.....

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