cross-posted from: https://slrpnk.net/post/36435067
An usually wide adoption of rooftop solar in Aleppo, Syria.
You don't even need to use car batteries (if you're referring to the lead acid batteries used in ICE vehicles).
LiFePO4 and Na+ are both options available as high-capacity power banks. They're not even crazy expensive either, and they're safer and last longer than Li+ and other options.