is there a way to limit the Mutliplus-2 so that the ESS installation sends max. 60% of the power of the solar panels back to the grid once the battery is 100%?
This is mandatory in Belgium for a home battery from March 2021 in order to be eligible for a subsidy from the government.
I don't have a Fronius inverter !, but an SMA sunny boy.
Both AC outputs are not connected, a backup system is not necessary.
Possibly by connecting the solar inverter to AC1 out?