Beside the grid protection relay UFR1001also sold by Victron for voltage monitoring in Austria, Germany, Italy, Switzerland, Ziehl offers its sister model EFR4001/4002 for current monitoring. Current monitoring is required by VDE AR-N 4105 if inverter power is larger than grid connection capability and known als Pav,e supervision. This is mainly the Multiplus power assistance function what allows to connect big loads up to 1,6x available grid capacity. According to latest VDE revision, the Pav,e relay is also required for zero export installations. This relay is also a certiified “EnFluRi” power direction controller required for EEG law PV installations with batteries what are not allowed to charge from grid.
In case of installations using this mandatory relay with Pav,e certificates it would be a good idea to use its high accurate meassurement values instead of extra grid meters like the VM-3P75, Carlo Gavazzi, ABB. The Modbus TCP registers are here:
Would be nice to hear from somebody with successfull communication