Dang that 6k is pretty prohibitive not for the overall level, but because it's 4 hobs or nothing. Hardly a "give it a swag" kind of level. I assume they are probably somewhat comparable to the Breville Control Freak, so at a single hob you'd be competing against $1500.

But the battery is a nice philosophy, similar to hybrid/mild electric cars. You don't need all the power forever. You just need more than a 120V circuit can provide.