The KOSTAL Energy Meter - Series C (KEM C) is a power meter for use with PIKO IQ, PLENTICORE Plus and PLENTICORE BI. For these inverter types in single operation, the KEM C provides the required data for the following functions: - Monitoring of household consumption (PIKO IQ, PLENTICORE Plus), - Regulatory reduction e.g. 70% of the feed-in power taking into account household consumption (PIKO IQ, PLENTICORE Plus), - Power consumption/output in connection with battery connection (PLENTICORE plus / PLENTICORE BI). The KEM C cannot be used with PIKO MP plus, PIKO CI, PIKO 4.2 -36 and the ENECTOR AC 3.7/11 wallbox or more than one of the above inverters.