[nimish]

Because the powerwall allows you to "buy" power at the opportunity cost of $0.02/kWh vs paying up to $0.32/kWh ? If you end up generating a lot of excess solar using a lot of grid power at peak times, it could pay for itself.

But of course, you need to do the calculation for your situation.

[boringg]

I don't think powerwall has that functionality. At least original powerwalls only provided backup power. From a C&I perspective this is one of the sources of revenue for batteries - however there are many different ways for electricity charges to be passed on to customers. It isn't only kWh.

[benj111]

"I don't think powerwall has that functionality"

From wikipedia

"When originally announced in 2015, two models of Powerwall were planned: 10 kWh capacity for backup applications and 7 kWh capacity for daily cycle applications"

https://en.m.wikipedia.org/wiki/Tesla_Powerwall

I take it the daily cycle applications include that functionality.