Expandable kit to start off with to use in the event of a hurricane.

[Matrix]

I like Schneider pretty well. The Conext SW series would do what you need and would be worth a look. Only Caution with the SW, Note that it is designed for 240v split phase (in N America) , but it CAN run 120v. BUT when only running it 120v it will derate the inverter Watts output specs. So you may want to browse the manual before consideration to make sure it would meet your needs.

[Matrix]

Also, SW's only do 24v and 48v so if you need 12v that would eliminate Schneider SWs