@weezmgk years ago I used to work as a renewable energy technician and I can confirm that this is the most absolutely cursed shit i have ever seen. what. what the hell.
every other grid tie inverter/charger I've ever seen puts out 60.0 hz derived off a crystal controlled clock; they have other means of detecting if for some reason AC mains has been connected to the wrong side of the AC power isolation relay.
cursed. powerfully cursed. literally, powerfully cursed. #CURSED