I have a MPII ESS with Fronius PV in parallel on grid side (AC IN). All loads are on AC OUT. The AC IN current is set at maximum 20 Amps. The Grid is showing ~3000 watts and the solar ~1000 watts. The battery is doing a scheduled charge. All good. If AC IN is limited to 20 Amps this should be showing a maximum of 4600 watts (230v) and I think it’s adding the solar to the total on grid side (which kind of makes sense) but it looks like the total AC IN is >4600 watts with full solar. Or is this just my OCD? Is there a way to make the current flow graphic go from solar to the grid to combine as the total input on AC IN?
Where is the Fronius actually wired to vs where it is located in the “PV Inverters” settings. If the Fronius is wired on AC Out and the PV Inverter settings have it on AC In (or vice-versa) then you can get something like this.
Hi Dean. The Fronius is on the grid side of the Multiplus II i.e. AC IN. I found a separate thread on this same issue from May and it suggested changing the location of PV to AC OUT - which I tried but this then added the PV power to the loads (which is also wrong).SOLVED - VRM Grid Power Incorrect - #4 by Chris78 I think it’s a firmware bug in the Venus display (since VRM is showing it correctly).
Using Gridmeter in MPII settings. No external current sensor. Gridmeter, PV and MP are all on the same phase. PV is on the grid side (AC IN). Multiphase regulation setting is set to total of all phases (did not change this). VRM is displaying flow correctly.
The devices are reporting each power level correctly but the GUI in v2 is adding the pv power to the grid power whereas it should be subtracting (as per GUI v1 and VRM).
No matter where you configure the fronius inverter (in or out) this should not affect the grid figure, as that is a “measured” size, not a calculated one.
Consumption is calculated, so wrong assignment of the pv inverter would only affect consumption beeing inaccurate on either side.
Since you don’t have a ACLoad displayed on the ACIn Side, this only can mean, that you have set the System to use “Internal/Inverter” Measurement rather than the external grid meter.
Thus, venus will show “as grid”, what is happening on ACIn of the inverters.
VRM will not use that setting, but use the grid meter available.
So, changing your system to actually use your external meter should fix this and make a box “AcLoads” appear on ACIn in VRM. (That’s the difference between grid and ACIn Measurement then, calculated by venus - but only visible IF venus is using a extetnal meter and therefore doing this maths)
You may also need to review other settings on your setup.
VRM/venus is calling the loads on the RIGHT side ACLoads. This also implies you have somewhere configured that you have nothing on ACout, just a grid parallel system on ACIn.
If you correctly configure your system to “grid on acin, loads on acout”, the box on the right should be called “Essential loads” in VRM, and the one mentioned on ACIn would be ACLoads only:
Thanks for taking a look. I do not have an external grid meter. All loads are on AC out. Grid is on AC in. I’ve switched back to GUI v1 as it is displaying correctly (same as VRM calculated values for grid minus PV).
