I was at the Northridge mall & noticed new public chargers by Volta, there were 2 technicians working on them so I went over & started chatting with one of them, turns out he was the owner, they started in Hawaii & have chargers in Arizona & California & growing rapidly, he said lots of chargers in the Bay Area & around 20 through out Los Angeles, they are free to charge & don't require any card or mmebership at 32A, advertisers on the charging stations cover the costs. Their web site & mobile app doesn't show most of thier locations but keep an eye out for them (owner said he owns a Roadster).
Volta
Volta Charging on the App Store on iTunes
Volta
Volta Charging on the App Store on iTunes