Fronius inverters have a special MicroGrid setup to ensure stable MicroGrid operation. The inverter provides the MicroGrid with as much PV energy as possible. If the load is less than the maximum capacity of the PV generator and if the batteries are already full (or the charging power of the inverter charger is too low), automatic PV power reduction will be required. Most of the time, the output of the inverter is controlled without communication. In this case, the frequency droop characteristic of the inverter charger and the Fronius inverter ensure optimum power setpoints.
With an inverter charger from Victron Energy (Victron MultiPlus, Victron Quattro), the Fronius MicroGrid setup can be used without further configuration on the Fronius inverter.