The Enphase Envoy-S is an integral component of the Enphase Microinverter System. It operates between the Enphase Microinverters and the Enphase web-based monitoring and analysis software. The Envoy-S monitors the microinverters that are connected to the PV modules. 

It collects energy and performance data from the inverters over on-site AC power lines and then forwards the data to Enlighten to give statistical data on how a solar PV system is performing. 

Envoy-S Standard - This model allows communication with the Enphase microinverters on the roof, commissioning and monitoring of the system over time.