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I noticed that the Feed-in Limited active status turns to NO when grid is lost that almost made my house burn as the fronius could not limit the power and my batteries were already full, the batteries got overcharged !
Any other requirements needed ? Fronius Primo 3.16, Cerbo 2.70-17, Multiplus v282, modbus tcp OK.
Hello,
in my opinion and by definition, the GX Feed-in limiting is only designed to limit the grid feed-in. So if there is no grid -> no feed-in -> no limiting.
In an offgrid situation the Fronius should be throttled down by the "Frequency shifting regulation" that is part of the ESS assistant in the Multiplus. From a safety point of view this is the only reliable way to reduce the power. You should check the Hz-settings of the ESS assistant in the Multiplus.
This are the default settings.
You could also look at the "AC Output Frequency" widget in the VRM portal. There you should see the change of the frequency when the grid is lost.
Hope that helps.
Regards, Rainer
Thanks Rainer ! I use the ModBus TCP to reduce power of the fronius when the grid is connected and as I inject only 100W it works great. I thought it would do the same when I loose the grid, it is very dangerous for the installation. I will try the frequency shifting to cut off the fronius, let s see if there will be a conflict between the 2 solutions. Thanks again !!
Have you configured the ess selecting that the system has a inverter on AC out?
And, have you set up the fronius in mg50 or 60hz? Have you change this value in fronius? Or does it keep configured in your country?
If your batteries were able to overcharge, you are missing a critical part in your setup: A BMS
Your BMS should have disconnected the batteries from the inverters/chargers once the voltage threshold was exceeded.
You are totally right, I have a DIY BMS to balance and still did not connect it to a DC relay breaker :( I have leaf module last generation; float in 56,7V and during the issue, it has reached 66V, I was lucky that did not burn and strangely, it seems working perfectly still.
