I have built a system for a customer. Been running for 2 months. It is Cerbo GX, 3-phase Multiplus-2 5000va, 64kwh, VM-3p75ct, 3x Fronius Symo 10kw, Fronius Smartmeter.
Fronius is one of the units Master and the other two slave. The property has 3x20A main fuses to the electricity grid. Fronius connected to Cerbo GX, both pv production and feed-in limit. Fronius smart meter is only as a backup limit in case cerbo gx loses contact.
VM-3p75ct shows very low power factor on many occasions. I have triple checked the CT placement, also tried changing their physical location. And also powerfactor is +0,9 and second after -0,9. No loads in the house are active.
At one point when I was there, the VM-3p75ct showed 15.4A on L1 while the Fronius Smart meter sitting right next to it showed 28A on L1, shortly after the main fuse at 20A blew. The consumption figure is also completely wrong, probably because VRM sees what Fronius gives and doesn’t think it goes out to the grid, so it assumes that it must be consumed in the house? But the numbers don’t add up either, 5839-4724= 1115w not 2373w. I guess it’s the Powerfactor that’s causing this?
This was today:
