I bought a Mr. Power 5k5 hybrid inverter (with wifi) for 13kbht 2-3 years back.
The wifi interface isn't that smart or that pretty, but it works as well.
It's suffered through being shorted out, and a few different power outrages, but keeps on working (after a reset).
Can't see the reason for spending big money on an inverter when the cheap ones work just as well.
As for batteries ...... who can predict the future?