I've just fitted a Multiplus II ESS system at home with 4 off the Pylontech US5000 batteries and it's working beautifully. We have a Britwind 5kw wind turbine supplying power to the house via an SMA Windy Boy 5000 inverter. I have set this up on the critical loads AC1 out so it can supply power to the house even when we get a power cut which happens fairly often where we are in the Highlands of Scotland.
We have a power cut at the moment and I am a little concerned what will happen once the batteries have fully charged. Normally any excess electricity would just bleed back into the grid but as the grid is isolated I am unsure what will happen once the batteries get to 100%. Will the inverter cut it's output, will bad things happen?
I should add that the Windy Boy is around 10 years old and does not communicate to the Cerbo GX.
I can just isolate the Windy Boy manually from my system and then it will shut down as it used to in a power cut but obviously I may not always be on hand to do that in the future.
Can anyone let me know what happens if a 5kw inverter output has nowhere to go?