A necessary evil
I haven't found the Enphase Envoy to be particularly impressive - it costs way, way too much for what it does; the technology is dated; communication between the PV array and Envoy, and Envoy to Enphase, is not consistent or reliable; the electronics configuration is less than ideal (e.g. if the Envoy is powered up but goes too long without dumping its data to Enphase, the onboard flash memory overloads and ends up corrupting the memory management kernel and basically bricks the Envoy; the on-unit control menu is clunky and doesn't always work; and you have to use the Enphase online user interface to access any data beyond total current production and lifetime production.
Having said all that, it's pretty much a necessary evil. Without it, you can't do real-time monitoring, log production history, create/configure a panel map, etc. Hopefully the newer models (Envoy-S, etc) are better, but from what I've read they're not.
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