I live in the US and recently bought an open frame Champion 7500 generator (non-inverter) to back feed my home through a generator inlet & breaker interlock (edited) at the breaker panel. It works for my needs (well pump, fridge, freezers, lighiting, etc.) but my existing AVR UPSs hate it.
I've looked into getting an online double-conversion UPS or an inverter generator but instead decided to design a critical systems sub panel to be pure sine wave inverter/charger and battery backed. This will act as a single UPS for these systems to work with the non-inverter generator and clean up my frequent brown outs from the local power company. I'm leaning towards starting with either 2x Quattro-II 2x120V or 2x MultiPlus-II 2x120V inverter chargers with 2x SOK 48V 100Ah PRO batteries connected to a dedicated 20-slot breaker panel.
I'm at the point in my design to determine what to do with the transfer switch for the generator. I was initially going with 2x MultiPlus-II 2x120V inverters in a split phase configuration with a manual Eaton transfer switch. My generator currently doesn't support auto-start but a future model may.
I figure using the Quattro-II inverters will eliminate the need for a manual generator transfer switch required for the MultiPlus-II inverters. Is this a correct assumption? The long term solution, and assuming I go with Quattro-II's, would be to install larger, permanent Generac 20kW generator with additional Quattro-II's to manage the loads. I'm not sure if this will ever happen with competing projects.
I don't want to jump into the wrong techonology pool but also am realistic about my budget and timeline for expansion until the rest of the house is remodeled.
Any advice or guidance is appreciated and thank you in advance!