According the data from my gridmeter I have used from grid between 10:00 - 10.15 → 0.035kWh & I have a average peak off 0.140kW.
According the data from the VM-3P75CT the grid was continue below 0 so this means impossible to come to a average peak higher then 0 & there can’t be any consumption.
What meter off the 2 is giving me wrong values? How accurate is the VM meter?
Belgium?
Maybe, but you can’t tell from the graph in the screenshot. The victron meter measures every 100ms and the graph looks to be displaying data every minute.
At low power the clamp meter has the disadvantage.
If this is a digital meter in Belgium you can’t compare these numbers as they account for grid usage and feed-in separately, the victron meter combines these in one reading.
Yes indeed Belgium.
Graf displays every minute but I supposse it is an average displayed.
If I look to similar spots off 15 min where the import stays 0 (gridsetpoint -150) then i have a similar view.
Otherwise if there is a small import then the green line goes indeed a bit above zero 1 or 2 minutes off the 15.
Gridmeter registers export when negative value ; import when positive value off the sum off the three fazes (green line).
I think the readings you have are within margin of error if you have no issues with the system. You can check a total of grid import and export in the vrm system overview, best to compare a longer period (like a day or more) to see if there are big deviations between the meters.
Marc,
My concern is the peak. This is calculated as a average during 15’. The grafics show clearly permanent below zero (green line) while a have a registered peak above zero. Difference is normal but average according the VM meter is arround -150W (my gridsetpoint) while the gridmeter gives me +140W. The strange thing is that this is just one spot off 15min during a whole day al the rest is nice arround the -150W (except during exporttime).
The graph shows the average for one minute is below zero, this can be 30s -1000W and 30s +900W. Your power company grid meter registers these separate.
This can happen when large loads are switched, the multiplus can only adjust 400W/second.
The 140W kwartierpiek translates to 35W being consumed over 15 minutes, that is equal to 3150W for 10 seconds. So if you turn on an oven for example this is expected behaviour because the multiplus needs time to adjust every time the thermostat switches on and off.
I don’t think there is a reason for concern unless the daily totals between the meters are very different.
I found it but it’s not correct calculated.
0.035kWh from grid during 15min → x4 /60 = 140W
As they state average consumption this should be (Consumed - Injected)*4/60.
Calculation is made to charge in function how heavy you load the grid.
