This is exactly why I went with Powerwalls. The batteries charge during the day from our solar array and then we use the stored electricity at night. I've only

This is exactly why I went with Powerwalls. The batteries charge during the day from our solar array and then we use the stored electricity at night. I've only had the Powerwalls for a few months, but we've already had several four- and five-day stretches where our production was high enough and our usage low enough that we didn't buy any power from the utility at all. Contrast this with previous average power bills in the $400/mo range, which are now down to $15/mo. There have also been a couple of brief power outages (5-10 minutes) where the only reason we knew about the outage was that the utility texted us about it before the Tesla app notification appeared on my phone.