Hello all, I am installing a Smart Shunt in my RV, and I seem to be getting some strange readings. It is showing the amps out that are being drawn at the moment, not the charge amps in. See different readings in pic. And it is not showing an increase in the SOC as it is actually increasing. Any hel…

What loads do you have on? The SmartShunt shows a net value, so I look at the numbers shown and it looks to me like you have a load of ~60A running; the solar controller is producing ~37A, which leaves ~22A still coming out of your battery to power the load. Editing to add: that’s assuming that al…

Thanks for the reply Justin, The load out is roughly what is shown on the Smart Shunt..around 20 amps. At the moment I also have about 65 amps going into the battery bank from one Victron 100/50 and one Midnight 150 CC. I can see this charging rate through the built in BMS readout of the battery ba…

I don’t know how Midnight runs their systems, but in general probably not. The SmartShunt must be the only thing connected to the battery bank negative, period full stop. Every other system negative, with zero exceptions, must run to the “loads” side of the shunt. So for instance, the shunt can’t …

Hi Justin, Okay now I am confused. From the diagrams I have seen, there should be no other negative connections to the load side of the Smart Shunt before it enters the inverter/charger. So I don’t understand how both charge controllers can not be going through the Smart Shunt. Both the Midnight an…

I think you may have misunderstood whatever diagrams you may have seen; please thoroughly review the full user and installation manual for more information. As stated, the “Battery” side of the SmartShunt must be the only thing connected to the battery bank negative, period full stop. Every other sy…

If it helps, you can draw a diagram of how everything’s currently wired in your system; I see an awful lot of wires running around, so can’t tell how things are actually set up. What’s important for the SmartShunt is: is anything and I mean anything at all, connected to the battery bank -ve other t…

Hi Justin, Okay I think I might see my mistake. In the second pic below, I am pointing to the terminal for all 3 negative wires from the batteries. From that point, a 2/0 wire goes to the inverter/charger, and it is on this wire that I installed the Smart Shunt. In the first pic below, is this wh…

If you have 3 batteries, and all 3 negatives are joined at a power post, then one wire from that power post should go to the battery side of the smartshunt, and then all other system negatives should go on the other side of the shunt. In your first pic it kind of looks like you’re holding only a neg…

Hi Justin, Ok I think I understand the issue now. My setup looks like the first pic, only using terminals instaed of bus bars. But I have both CCs grounded at the same negative terminal as the three batteries. See pic. My fingers point to the negative wires coming from both the Midnight and the Vi…

[image] Dean3: If I understand correctly, these two charge controllers need to be removed from this negative terminal, and connected to the “load” terminal at the Smart Shun Correct! The shunt is a gateway to the battery, measuring everything going in or out of the battery bank, but if you ha…

Strange readings with new Smart Shunt

Q&A and troubleshooting

pwfarnell 6 November 2025 21:47 15

I know I am late here, but have a look at this FAQ. rV installs often get the chassis ground wrong, this must also be on the system side of the shunt.

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Strange readings with new Smart Shunt

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