Its been around 100 deg where I live in SD this past week. I had a 4ton SEER 16 Goodman central AC unit installed about 2 weeks ago. The home is 2200 sq feet with 11 ft ceilings. At 72 degrees the overall energy production/consumption is almost perfectly balanced in terms of kwhr. Due to time of use pricing the cost doesn't balance out. However, the accumulated energy credits more than offset the costs on the hot days. This home does have excellent insulation and that can make a big difference as well. A battery system would work with a reasonably efficient AC assuming you have clear skies on the hot days. If not, just run a supplementary gas generator (if you live in CA and are working from home you've probably already invested in one this past year). Last year we had around 8 days of outages. One outage lasted 3 days. When you're working from home spending a bit extra on energy infrastructure doesn't seems perfectly reasonable.