I'm working towards a plan for our property to give us full energy independence - moving everything to be electric, powered by solar and batteries. The Grand Design, the end goal, is that we never pull from the grid. During the day we use solar, any excess goes into a battery bank, then goes on...
Sadly we have no banking - they call it "net metering", but it isn't. It's "net billing".
Agreed completely on your battery pricing. Retail battery packs break the budget without even considering the inverter.
My inverters are Fronius Primo, and on the data sheet it says they are California...