Nice work... simple yet effective. I like that you can keep the battery box separate from the inverter. Solid use of Anderson plugs.
Not that it's legal to do without a generator interlock kit on your main breaker panel, but you could use that like a generator to back-feed the house for backup power to run a fridge in the event of a power outage.
Something like this might be pretty useful around the garage or house.
18 In. x 12 In. 1000 lb. Capacity Hardwood Dolly
If you have a backyard or place to store that and dont use it often, I would add a solar charge controller and a 100 watt solar panel just so its always charged, maintained, and ready to use.
