The LCF is essentially an outdoor rated box with a built in EMU and filtering for the feed from the PV sub panel.
The Enphase Envoy Gateway
is the data logger / internet gateway for the micro-inverters in the Enphase micro-inverter system. The micro-inverters communicate performance and production data over power lines to the Envoy. We refer to a grouping of one Envoy and the micro-inverters associated with it as a single communications domain. For systems larger than 208 dual micro-inverters, more than one Envoy is required. When multiple Envoy gateways are required, a Line Communications Filter is also required, to prevent communications data from one communications domain from cross-talking to another.
The Line Communications Filter has a maximum current rating of 125 amps. This rating works well with a 125 amp, 24 space main lug load center containing eight 3-pole 15 amp breakers. Eight branch circuits fully loaded with 26 dual module micro-inverters each, equals a total of 208 dual module micro-inverters. The output of the load center would pass through the Line Communications Filter enclosure on their way to the main power distribution panel.
The line communication filter contains a filter network that prevents the powerline communications from exiting the communications domain. The line communications filter also contains an Envoy gateway that is connected to the micro-inverter side of the filter network.