An existing hybrid system with 2 x 5kVA Multiplus is having grid issues so we are looking at installing a separate Multiplus 3kVa connected to a generator in the charger only mode to charge the battery bank (40kWh LiFe4Po) manually (i.e. switch on the generator when low SoC and no grid). How is this connected to the GX device (Cerbo) in order to monitor?