The Energy Meter can be used for three things: Grid meter, used to control input/output for an ESS System Measure the output of a PV Inverter Measure the output of an AC Genset The meter is connected to the Color Control GX or Venus GX. There are two options in its wiring: Direct connection, using the RS485 to USB interface (1.8m and 5.0m cables availebl) Wireless connection via a Zigbee bridge