Radio Ripple Control Receiver (RRCR)
A Radio Ripple Control Receiver (RRCR), also known as a Ripple Control Receiver (RCR), is an interface between a photovoltaic (PV) system and the power grid company. The grid operator can control the PV system via digital radio signals sent to the RRCR. The RCR receives these signals and passes them either directly or through an interface, such as a data logger, to the inverter. The inverter then limits the amount of power fed into the grid.
Typically, four digital inputs on the inverter or the intermediary interface are required for this functionality. In Germany, the power grid company regulates whether the PV system can feed in 0%, 30%, or 60% of its capacity when the power grid is overloaded. When the grid is not overloaded, the grid operator sets the inverters to 100%. The RRCR is obtained by the installer directly from the power grid company.
