Hello,
We have installed two Multiplus II-48/3000 with cerbo GX and Smart Solar MPPT 70/150. It turns out that on ESS the Grid Feed-In is disabled but still the system is sending to grid. What adjustments need to do to lower the value even though the system does not have an energy meter installed?
Really need more detail.
Is there a wiring diagram? How is it configured.
Without this we would need a crystal ball to help.
Hello @nickdb I’m glad you replied. Here you are components and configuration:
Let me know if you need further info.
Regards.
I would start by changing the grid setpoint to a positive value like 30 or 50 for example.
Yes you need a positive number as a grid set point. With the current -10, ESS is always trying to feed at least 10 watts back to the grid.
Sometimes it is the balance between units.
Do you really have loads before your inverters (in ac system)?
You have plit phase I do not have any experience with that type of set up, i do have on 2/3 phases etc.
So some thoughts from there. Does it use ohase regulation?
The vrm shot shows 78w is there one swinging more negative and one more positive?
It was positive before first 50W then 30, 20 and now that I was trying negative value.
If there is an imbalance between systems this can help you identify it:
The system is grid connected but the meter (not bidirectional) is measuring these values fed -in as consumption and although solar and batteries are saving the electricity bill will be affected by this value.
Try switching to individual phase regulation.
And then ac loads are on the output only.
Hi,
this is the normal way ESS works even when “No Feed-in” to grid is selected, ESS keeps balancing phases. As a result, there is a grid consumption which is around a few hundred watt/hour.
Globally, for my system, it was 4 to 5 KWH per day for 3 Multiplus 5KVA connected in 3 phases.
To resolve this issue, I have configured ESS in “Grid Fall-back Automatic”.
This means that the grid is not any more permanently connected. The grid is in reality considered as as “Generator”. Using the ESS function “Generator Start/stop”, I control the connexion to grid through a power relay piloted by the multi plus relay. I have set-up conditions such as the grid will reconnect when SOC has reached 20% or when one phase is overlaoded (95% of the maximum value). Concerning the minimum SOC value, I have logged 15% into ESS parameters.
In short, in normal operation mode, the grid is disconnected, so NO Consumption. If the SOc Reaches 20%, the grid is connected, ESS works according to normal operation mode but the loads are still fed by the battery as long as the SOC is higher than 15%. When SOC reaches the limit, ESS connects the Grid to the load whithout switching the inverters in charger mode. The battery keeps idle awaiting recharge from Solar. When the SOC is detected at 30%, the grid is disconnected.
For overload on one phase, it works the same way . ESS activates “power assist” factor 2 as long that the overlaod is detected with a 3 Mn delay.
Globally, using this configuration, the consumption from grid is reduced to minimal value, around 1% over one full year.
nota: with a 3 phases system, according to Victron, the grid set point should be logged to 0%
@lxonline that did work along with balancing the loads for both phases:
