Hey everyone! I'm in a bit of a dilemma trying to figure out the best inverter setup for my enphase combiner system, which peaks at around 9.8 kW. I'm looking to add an EG4 inverter and battery mainly for backup during hurricanes. I would like to understand how the Flex21 combined with the Gridboss compares to the 18KPV in terms of AC coupling for my situation. From what I gather, the Flex series needs the Gridboss to enable AC coupling, but does the 18KPV already have this feature built-in? Additionally, I plan to use my 11kW propane inverter generator to help charge the batteries at night if necessary, and I'm considering using MPPT connections if I decide to go with the Flexboss setup.
2 Answers
Definitely, those EG4 YouTube videos are super helpful if you're looking for detailed explanations! They break down all the technicalities much better than a lot of texts can. Definitely worth checking out!
It’s great that you’re doing your homework! Just so you know, the Flex series definitely requires the Gridboss to enable AC coupling. On the other hand, the 18KPV has that feature built directly in, so it might save you some complexity. I’d also recommend using chargeverters for battery charging. They manage generator power really well, even with inverter generators. Just speaking from experience—I run an 18KPV with my enphase setup, and I’d totally stick with the same choice if I had to do it again!