Due to Solar, some hours of the day have negative energy prices. Your profit potential is infinite if you can charge from 11am - 5pm and then release it all from 7pm-midnight.

https://www.researchgate.net/publication/341393321/figure/fi...

What we should be doing though is building this smart charging and dispatch functionality into cars, so that we don't make our existing electricity peaks even peakier when people get home from work and immediately plug in and charge their EVs.

Ideally people would charge their cars at work, during the day. I guess we need to lean on employers with huge parking lots to provide EV charging.