When your car is delivered to you, you'll have all you'll need to be able to charge from the following types of outlets:
- Tesla SuperCharger (these also appear on Tesla's in-dash navigation; these charge fastest, at a few minutes to give you 100 miles of range)
- Tesla Destination Charger (Level 2 connectors found mostly at hotels and restaurants, providing up to 48-amp, 200-240-volt charging for LR Model 3s; they'll add 100 miles in about 2.5 or 3 hours)
- J1772 Level 2 (quite common, usable by most EVs, usually a little slower than Tesla Destination chargers, at 30 or 32 amps, which adds 100 miles in about 4-5 hours; you need an adapter that comes with the car to use these EVSEs)
- NEMA 14-50 (200-240v wall outlets, often available at camp grounds and usable via the Mobile Connector that comes with the car; will charge at levels comparable to a J1772 Level 2 EVSE)
- NEMA 5-15 (120v wall outlets, available everywhere and usable with the Mobile Connector that comes with the car, but at an excruciatingly slow rate of 12 amps at 120v, or about 1/6 a Level 2 J1772 EVSE, which takes about a day to charge 100 miles)
In my area, NEMA 5-15 outlets don't often appear on PlugShare. I'm guessing that most people don't bother adding them to the app. I also don't see many NEMA 14-50 outlets in my area, but I do see them along some road trip routes, mostly at camp grounds. For day-to-day away-from-home charging, I mostly use public J1772 EVSEs, many of which are free in my area. Depending on the unit, they add about 20-25 miles of range per hour of charging. This isn't very useful for road trips, but if you lack the ability to charge at home, you could rely on such chargers at parks, shopping malls, your workplace, etc., to charge your Tesla; and even if you do have home charging, many of them are free, which makes them enticing if you happen to want to do something where such an EVSE exists.
In addition to these, Tesla offers adapters to let you plug into about half a dozen other types of outlets; see the
ordering page for the adapters on their Web site. You'll have to judge for yourself whether any of these are worth getting (they're $35 apiece). If you happen to have an unused NEMA 14-30 or 10-30 dryer outlet in your garage, for instance, buying one will enable you to charge at home with the Mobile Connector, albeit at only about 24 amps. That's probably fast enough for day-to-day use unless you drive a lot or want to charge during a very narrow window (say, if you've got a time-of-use electric plan with a short off-peak rate window). Even a NEMA 5-20 plug will improve charging speed over a 5-15. (NEMA 5-20 outlets have one slot with a "T" shape, and should be used
only on circuits rated for 20 amps, vs. 15 amps for NEMA 5-15 outlets. Note that actual charging rate tops out at 80% of the rated capacity. This is a code/safety margin issue.)
PlugShare also lists CCS and CHAdeMO stations. These are DC fast charging protocols used by non-Tesla EVs. Although Tesla sells a CHAdeMO adapter, it is
not currently compatible with the Model 3, so don't waste your money on it unless/until it's updated to work with the Model 3. Even then, it's probably not worth the money (currently $450) unless you're in an area, or plan to take road trips to an area, with poor SuperCharger coverage but better CCS/CHAdeMO coverage. (Parts of Canada are like this.) Tesla is preparing a CCS adapter for Europe, but both the version of CCS and Tesla's charge port are different in Europe than in the US, so that adapter will be useless here, and it's not clear if Tesla intends to produce a version for North America. So in sum, you can remove both CCS and CHAdeMO stations from your PlugShare results.
PlugShare offers a few other exotic plug options, like the Tesla Roadster, but these are incompatible with the Model 3. If you sign up with a PlugShare account and tell it what kind of car you've got, the app has an option to filter out everything that's not compatible with your car. You might start with that set of options -- but it's likely to include NEMA 5-15 plugs, which IMHO will just clutter the screen.
It sounds like you have a specific charging scenario and are trying to find solutions. If so, sharing details of your charging capabilities, or lack thereof, may enable people here to offer suggestions.