Grid providers in some Markets (e.g. Germany for PV Systems >25kW or as requirement for state subsidies) require that PV Plants are controllable by them via RCR. Technically this is a small box with 4 Relays triggered by a simple form of PLC signal from the grid operator.

Figure 1 Rough schematic

EzLoggerPro and SEC1000 can be used to realize the multi-level throttling of PV power to 0% / 30 % / 60% / 100%.

Note: only works with PV inverters (no Hybrid or Battery inverters)

Figure 2 EzLogger Pro & SEC 1000 interfaces

Figure 3 RCR wiring to EzLogger Pro and SEC1000

Figure 4 Setup in ProMate

Workaround for hybrid and battery inverters

The DRM0 interface or the remote switch interface can be “misused” for the same purpose. With their help 0 % / 100% throttle can be realized.

For some DSOs in Germany this is acceptable.

Note: Clarify with DSO before installation if that is acceptable ( 0 % / 100 % instead of 0 %/ 30% / 60% / 100%.