May I ask why you wouldn't be able to charge it at home? It is my understanding that most people simply charge their electric cars overnight, much like their phones.
Either way (I could be wrong) I don't think you can just plug it into a 120V outlet to get a charge.
That's what prevented me from buying one as well. I didn't want to have to go wait in line at one of the few public chargers in my city.
A 120V/15A outlet will deliver 1.8 kW. Assuming "overnight" means 12 hours, you can charge ~21 kWh, about 80 miles in a Model 3. Probably enough to keep it topped off after your daily commute/driving. (Edit: apparently 15A means 12A, so a bit less)
Some employers also offer EV charging spots.
And I'm lucky enough to have a parking garage. At least ~70% of the people living in my area park on the street, where there are... Also no chargers.
With a service like Chargepoint, there is no cost to the landlord at all. They have a brochure you can print out on their website.
Failing that you can park near a regular 120v outlet and use level 1 charging, which fills up most cars in about 8 hours.
A regular 120V outlet is 15A at best (usually 12A). That's barely enough to charge a PHEV in 8h, let alone a BEV. Practical example [0]:
> connected to a 240V outlet, the onboard 7.7kW charger should take the battery from 0-100% SoC in 2 hours 25 min. (A 120V charge will take a bit longer at just over 16.5 hours.)
[0] https://arstechnica.com/cars/2019/10/on-the-road-with-audis-...
The EVSE run between $500 - $1000. Add in the cost of a residential electrician, and I'm estimating $3k total. If it's commercial, then double that. If you have to trench and do concrete work, double it again. Get into a ROW with other utilities, even worse. It gets expensive really fast.
The level 1 charger for my 24 kW*H Leaf says 24 hours for a full charge. Forget about it for a Tesla.
2 Not everyone lives in a house with of street parking
1. not every part of the U.S. grid is in dire need of improvement, most homes have access to 240v most of the time. (with the exception of the 1 state that has assigned fire damages to their utility. And, most vehicles are charged at night, outside of peak demand. (also, the Tesla wall was a technology that further decreased demand on the grid)
2. Most of Montana is going to have off street parking, be it a barn or garage (and with at least 120v) mostly by the necessity that sub zero temperatures ~2 months of the year freezing anti-freeze, batteries -- and that you can't use an ice scraper to scrape off feet of snow.
All the mains sockets in uk houses are 240v - this is whey you never see an electric kettle in US homes
By code, US 2 phase (120x2 == 240) is going to be wired with lower gauge wire to provide more overall electricity. Typically, the 240v is going to be capable of providing 600 total amps (though there are cases where 400amp is served); with a typical breaker at 30 or 40 amps. compared to a triple 415 providing 8 or 15amps.