@Singerjohn,
Do you have home charging set up? If not, your priority should be to get that going first. Please see Tesla's home charging and standard equipment page:
Home charging installation
Basically, you will need an electrician to come install an outlet for you. The preferred outlet type is a NEMA 14-50. Sometimes, your home, wiring, breaker panel, or service limits how much power you can get, and in that case your electrician may need to install a lower power outlet, such as a NEMA 14-30 (this is a common outlet for dryers).
The standard connector for the Tesla is called the Universal Mobile Charger (UMC), it comes with the car, and also comes with connectors for NEMA 14-50, as well as a regular 120V wall plug (technically a NEMA 5-15). There is an optional adapter for the 14-30 (
Tesla — NEMA 14-30) if your electrician has to install that instead of the 14-50.
The UMC kit also comes with an adapter called a J1772 -- this is a very common connector found on 95%+ of the public charging stations such as ones by EVgo, Chargepoint, etc. The one you have at work is probably this type.
It's important to realize that the Tesla battery is so large that if you have home charging set up, you will rarely, if ever, need to charge at a public charger. I've had my Model S for 2 years now and I've used a public charger twice -- and one of those instances was just to test it. 99% of the time, you will come out every morning to a 90% full battery, and do all of your daily driving and tasks without charging. At night, you plug in, it charges overnight, and repeat.
For road trips, you use the Tesla Superchargers.
You mentioned that you have a Walgreens nearby, they probably have two types of chargers there. One is the J1772 which you will have an adapter for. The other is whats called a DC Fast Charger, and uses a plug called Chademo. You can use this with the Tesla, but only with the optional Chademo adapter (
Tesla — CHAdeMO Adapter). I would only recommend this adapter if you're going to be doing road trips where you're in areas that are not near superchargers. The usability of these is limited, as there are not very many of them and maintenance/repair can be an issue.
Charge speed can be a concern with these different charging options. I'm going to assume you're purchasing a 90 kWh battery, and that you have the standard 48A onboard charger (i.e. you did not get the high amperage charging option). With those assumptions, here are the times required to charge the battery from 20% to 90% with each of these charging options:
Type -
Time (Hr)
120V Wall NEMA 5-15 -
48.1 Hr
Dryer Outlet NEMA 14-30 -
12.0 Hr
J1772 Public charger -
12.0 Hr
NEMA 14-50 -
7.2 Hr
DCFC Chademo -
1.4 Hr
Supercharger -
0.8 Hr