And there goes all our work and efforts to make the fastest and low latency possible meter.. out the window
Itâs amazing fast but when the victron multiplus 2 tries to keep the grid at 0 watts it seems to come in an oscillating state. When the multiplus is idle, the VM-3P75CT reading is also stable, even with pv power. Maybe it doesnât have to do with the fast reading but more with the pid control loop which is over shooting the setpoint.
The burst mode of enphase can indeed cause fluctuation but thatâs not the only thing that causes oscillation because there is no oscillation when there is enough pv power and the multiplus 2 is idle. If it was just burst mode that for me would be perfectly fine because itâs something that canât be solved without replacing pv inverters.
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Had the same here now, as i replaced my Shelly 3EM with a VM-3P75CT on the PV Inverter side - to be more in a supported âVictron worldâ. I have 5 Hoymiles 1500 Microinverter on my Garage, feeding into 3 phases there and values are oscillating sometimes up to 400 W up and down. The Shelly 3EM didnât show this behavior. Clamps are correctly closed - did triple check this today.
Also did add one on the Grid side to have faster readings, and get the numbers in VRM right
Today i really had some kind of a resoncane loop with the Multiplus when i heard the fans going off and on all the time today as the Multiplus was feeding up and down back to the Grid to compensate. Multiplus were also rumbling up and down so you could feel the oscillation which is going on. Changed ESS config for a moment to use the internal meter of the Multiplus to see if that changes something but it didnât (unclear who quick this change applies). Didnât have this behavior beforeâŠ
Any update on that topic? VRM Site ID is 286123
No update about this issue unfortunatelyâŠ
I see same behavior with several Hoymiles HMS-2000, HMS-1000 and HM-600.
Currently my system is switched off due to no sun, but if you like to enable logging, site id: 382372
Ping me, I will switch on.