The Tesla Model 3 and later Model S/X (after spring 2018) come with a second generation Mobile Connector (MC) that supports a wide range of plug in adapters for eight different electric plugs. While the Gen 2 Mobile Connector comes with adapters for a 15A household receptacle and a NEMA 14-50 50A 240V receptacle, you can buy other adapters for many other receptacles.
One problem with the Mobile Connector is that it is only 20' long, and your receptacles could be farther away. There are two ways to fix this: either make your Mobile Connector cable longer, or buy an appropriate extension cord.
Quick Charge Power is a company that will modify your Mobile Connector and lengthen the cord to any length you want. I'd suggest adding 30' to make your cable 50' long in total. While permanently modifying equipment sounds bad, this is an elegant solution since it will work with any plug/receptacle you comes across.
As an alternative, buying an extension cord isn't as easy as it sounds. A heavy duty household cord will work if you are extending a household plug, but what if there is an unused dryer plug just 30' feet away from your car? And there are two different types of dryer plugs. And then what if you're at an RV park and need extra length to reach a 50A receptacle? That's four different extension cords. If your travel habits are fairly consistent, and all you want is to reach a single known receptacle in your cabin, then a single purpose extension cord will work fine. But if you want a general purpose extention cord that will work for any receptacle you might find, then you have to use the heaviest duty extension cord there is, and make or buy adapters to adapt that extention cord to other electrical plugs. And then, finally, you'll have to dial down the amperage settings in your car to match the amp rating of your electrical source.
The Make Your Own Adapters page shows you how to make these adapters.
Occationally, you might find yourself in a location that has an unusual receptacle. Marine ship to shore plugs, TT-30 travel trailer plugs, or even trying to recharge from a generator that has a locking plug. In these cases, you'll probably have to build your own adapter.
If all you need is a single extension cord for a known destination plug, here are some links:
For a NEMA 14-30 (modern house dryer plug), I would just use the 14-50 extension cord above and saw off the neutral blade (straight blade opposite of the round ground) since the neutral is not used for car charging. This allows it to plug into either a 14-30 or 14-50 receptacle. Just remember to dial back the amps to 24 amps when using a 14-30 receptacle.
If you take a long trip to your or a friend's boat dock, this will come in useful. Many marinas have these 50A 240V receptacles for ship to shore power. The plug is a NEMA SS2-50. The interesting thing about this plug is that it is almost identical to the plug used for large venue temporary power. I've been to outdoor events where these plugs are literally all over the place. The temporary power plug is the CS6365 also known as a California Style plug. The only difference between it and the NEMA SS2-50 is the addition of a center pin.
Here is a manufactured adapter that will plug into EITHER the NEMA SS2-50 or a CS6365 and adapts it to a NEMA 14-50. You can then use the NEMA 14-50 adapter with your MC.
Note if you are planning on charging at a marina, check to see what kind of receptacles they have ahead of time. Like RV camp sites, a given marina might only have 30A connections instead of the bigger 50A connections. The 30A connection could be a TT-30 (see RV section for adapter) or a 30A 120V twist lock that will require a different adapter.
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