I like these kinds of logistical charging dilemmas, and I have some suggestions that come in a few categories:
1. Supercharger + 120V outlet. This is probably easiest, depending on how far they are from the nearest Supercharger. A Supercharger is going to be several times more power than anything you can get at their house, so you may be well served to stay the extra 20-30 minutes to get your car charged to nearly full at the Supercharger and then you can get about 40 miles or so overnight from their house without having to do anything complicated with adapters. That may be enough to bridge the gap to and from their house.
2. Drop off for some local charging. Probably second easiest. You have a ride since you’re visiting a friend, so look up on Plugshare where there is a charging station or RV park in their city. Have your friend drive over with you, hook up, and then leave your car there for some hours while you go and do stuff and come back to pick it up later or in the morning. This is also pretty easy if you need more range than option 1.
3. High-ish power charging at friend’s house. The only accessible 240V outlet you can find at most people’s houses is an electric dryer outlet. That will be either a 10-30 for older homes (pre-1996) or 14-30 for newer homes. The tough thing might be how reasonably close to the garage/driveway is it and how hard is that going to be going through doorways or upstairs from a basement laundry room? (yes, I’ve done that one) Making this work is sometimes tough and not worth the bother, but it is nice to know you can be full in the morning. If you’re going to do this, I recommend these:
Heavy-duty NEMA 14-50R extension cord for Tesla, 20 ft.
That is a 20 foot extension that can handle 30 or 50 amp circuits. The plug on the end does not have the neutral pin, so it can plug into either 14-50 or 14-30. Very nice. I do recommend this over getting a real RV extension cord because those also include the unused neutral wire, which makes them much heavier and bulkier and more cumbersome to work with for no benefit. They do also have a 50 foot version.
NEMA 14-50R to 10-30P Adapter
And if they have an older dryer outlet, you will need this to adapt to the 10-30 plug.
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NOTE* You may have already heard about this, but if you are using the official Tesla 14-50 plug and then using these adapters to go down to a 30A outlet like a dryer, you will need to manually adjust the current in the car down to 24A or less.
Want to give a clue what city this is in, so we can check Plugshare or EVTripplanner to give more specific advice?
