Victron battery monitor help

Is the little red power wire to the shunt hooked to + ?

CA Traveler wrote:
Measuring the shunt voltage is a good check but requires a voltmeter to measure very low voltages. A 500A 50mV shunt would measure 0.01V at 100A for example.

That's a good point. A 4 digit meter in the 2v range should see something. A 5 digit or analog meter would be ideal. A 3 digit likely won't register.

Another test would be a clamp ammeter on the cable feeding the shunt. It will at least confirm if current is flowing through or bypassing it some how.

Measuring the shunt voltage is a good check but requires a voltmeter to measure very low voltages. A 500A 50mV shunt would measure 0.01V at 100A for example.

I can't even find the wiring diagram on their website.

So some basic troubleshooting.

Put a good load on your battery bank, like a toaster, hair dryer, etc. and measure across the shunt with a regular volt meter. You should see a voltage, likely a few volts, or even less than a volt, but the reading should be constant and not jumping around like meters do sometimes when not connected to anything.

If you see a voltage, then the problem could be the PCB, or the connection between it and the monitor.

If you don't see any voltage, then there's a problem with how the shunt is wired into your system and current is bypassing the shunt.

The shunt has to be working correctly, since I have power to everything, so I think it has to be the circuit board that is mounted on the shunt.

I haven't bypassed the shunt. There are no connections to the negative terminal other than the shunt. All connections are on the load side of the shunt. It is wired correctly (I triple checked my wiring), it isn't working correctly though.

Sounds like you have by-passed the shunt by leaving the battery neg to frame wire in place instead of having it now go from the frame to the outer end of the shunt and wire the inner (closest to batt) end of the shunt to the neg battery post.

Oops, I have the BMV-700.

Which pieces do you have?