question

Any other DC loads?

Switch off the MultiPlus and see what's happen, deactivate the MPPT and see what's happen.

Maybe do the zero current calibration.

So I shut the mpii off and the numbers were still off. This time they were off by about 14.3 amps (see screenshot). This would make sense to me as I would expect about 10-15 amps of dc draw with my rv lights and other things on (which they are right now) - so if we zeroed out the discrepancy in this screenshot I think I’d be good.

Is there a way to recalibrate the smart shunt? Would that even be the right calibration to run?

SmartShunt zero current calibration procedure is described in its manual:
https://www.victronenergy.com/media/pg/SmartShunt/en/all-features-and-settings.html#UUID-c5fc25c8-93aa-2f98-bfe3-46cb4dd6cc8d

Basically you turn off everything (don't disconnect the wires under load), then disconnect everything from the battery, except the SmartShunt. Easiest way is to disconnect the wire from the System/Load side of the SmartShunt.

Then use VictronConnect and check the SmartShunt current. It should be 0A (Zero Ampere).

If it is not 0A with everything disconnected from the battery, tap the "calibrate" button.

Good suggestions above. Just to add, I'm constantly surprised by how much power my LED lights draw.

Well, @Matthias Lange - DE and @Seb71 , I did the zero current test last night and there was no current running when everything was disconnected. So I didn’t calibrate.

I guess that leaves me to assume I’m pulling a whopping 25-30 amps of dc power? I guess I may just start flipping breakers on the distribution panel and see how low I can bring the dc consumption down.

Any other ideas? Thanks!

@Seb71 all connections look and feel good. Seems a consistent 25-29amp bleed of power somewhere (or just bad readings on the equipment not talking well to each other). I flipped every ac breaker off today and it had no impact on reducing the discrepancy (I.e., closing the gap on the numbers). So I’m guessing it’s got to be on the DC side somewhere (or bad equipment somewhere in the chain).

Tonight, we are in a Walmart parking lot so I had the chance to run the ac off the batteries. Cloudy day so solar didn’t help too much, though the numbers were wildly off again like the above pics in this thread.

Anyhow, I fired the generator up and now on the charge from both the MPII and solar, the numbers are still off - though less. 23 amps charging from MPII, 20 amps from mppt, and yet only reading 36 amps being input in the smartshunt - so off by -7 amps (should read 43 amps being input).

Any ideas? Maybe a bad smartshunt? Maybe a bad smart dongle for the MPII? Something else?

Thanks all for your help!

Here’s another pic for reference. Now it’s just the MPII charging and there is still quite a difference between it and the smartshunt.

Your screen shots show different battery SOC readings on the smart shunt and multiplus. The multiplus should be using the smart shunt values. It's in the Multiplus settings.

Also in the settings ensure SVS and SCS are turned on.

I'm suspicious of your wiring. Check the shunt battery wiring. All the batteries should have their negatives joined to the battery side of the shunt. There should be no other connections to the battery negatives. The batteries should be grounded to the chassis through the load side of the shunt, not from their negative terminals.

Lastly, this is all running through a lynx distributor. any chance the power bleed could be somewhere in there? I ask because my MPII shows it’s sending, for example, let’s say 20 amps to the battery. The shunt only reads that the batteries are receiving 12 amps. The wiring goes from the MPII to the lynx then to the batteries. Something in that line has to be sucking some juice constantly and quite heavily.

All I have connected to the distributor is both mppts, the house lines to the main distribution panel, the MPII and the wire to the onboard generator to crank it up. I’m a little baffled here.