Hi folks, having setup of three MP2 5000VA on-grid system plus BYD LVL 31kWh battery, with AC-coupled SolarEdge invertors.
My issue is that despite I set GridSetPoint to -150W (which I would expect to cause “slight” discharge to the grid, etc) and despite the vrm shows -150W to grid sometimes, at other times there are “plus” oscilations (although the night consumption is rather stable around 500Wh).
Therefor, when seeying it at the morning (like today), I have a balance between 0 and 6 hours “from Grid 0,5kWh” and “to Grid 0,2kWh” (when I would expect “from Grid very low” and "to Grid 0,8kWh or so).
So I am still consuming a bit of grid power (for which I have to pay, obviously). During the day, as long as the AC-coupled PV produces more than 500W, I usualy have nothing from Grid.
So what is the issue? How come a gridsetpoint of -150W results in so high grid consumption?
What kind of grid meter do you use? Are your main loads connected to ACIN or ACOut of the multi?
Because consumption on ACIN can only be accounted for when the grid meter starts to measure and report actual grid2load happening and the inverter can start to react to that.
However that always give some split seconds of energy beeing pulled from grid.
Using ET340 as my meter.
My setup is that everything is hooked at ACOUT1 (including my AC-coupled SolarEdge invertors). So I got no loads at ACIN, there is just GRID->ET340->3xMP2 there.
I understand “some” energy would be pulled from grid nevertheless, but the house is fairly stable thoroughout the night, taking around 400-600Wh, with oscilations up to 800Wh (but no more as water heater is now used thoroughout the day only). So getting oscillations (as to be able to se 400 from grid at vrm at some moments) and to get 0,5kW in the morning is rather frustrating. Also, with GridSetPoint of -150W one would expect “to Grid” in the morning much higher than these 0,2kW.
As said, in this time of the year I have thoroughout the day electricity in spades (and big battery). So I am willing to lose some in the grid, but I really dont know why I should by buying any!
You should generate advanced graphs of all 3 ACIN Values and see if it’s a particular phase that is not balancing well, or if it appears on all phases.
Optionaly - since you have no loads on acin - you could give it a try with switching from “external meter” to meateringmethod “multiplus” and observe for a day or two if that makes a difference.
(Or verify you actually set that to “external meter” at all)
Thanks - yep, I have external meter set on. Do you think I can switch to “multiplus” without any issues, just to try it?
My graphs look like this - and yep, I have GridSetPoint at -150W, which definitely does not look so when looking at the graph:
