Will I regret this charging installation? NEMA 14-30 or 14-50

Look up good local installers and consult the electrician you’re paying to do this. Tesla certified installers can be a place to start regardless of what charger you go with. > The outlet will be approx. 30 feet from where the car will be parked for charging. I plan to use an adapter and extension cable to reach from the outlet to the car for overnight charging Bad idea IMO. Don’t use extension cables beyond what the charger has. Maybe there are some with thicker but longer car connectors. Improper setups can cause lots of issues and even fires. In regards to overall load, an electrician can do a load calculation. If you’re going to spend all the money on a car and proper charger your best bet is to get the higher amperage wiring regardless IMO. You can have the charger use less power if needed. But if you go the NEMA outlet route you can’t necessarily control how much power other things use when plugged in. IMO there’s no benefit to installing a NEMA outlet unless you plan to use other high load electrical devices there. You can get more power to the car with the same breaker and cable using a hardwired charger. Since your load varies a lot by month you can also get a charger that has dynamic load balancing. It can help reduce car charge power when overall panel load gets high. That will help you avoid overloading the panel.

You didn’t mention a non Tesla charger… the outlet is separate, installing a hardwired charger is better overall but as long as they don’t put a 6 dollar outlet on there you’ll be fine. Every manufacturer is switching to NACS and Tesla makes a universal one that is nice. I honestly don’t think a non Tesla vs Tesla charger will truly make a difference in resale. I installed what was most convenient for us. So Tesla charger for my wife and j1772 for myself, both hardwired. As for size 30 will be fine for the Tesla, you might find it not enough if you get an EV truck though.

Similar to your home, mine had several heavy loads including pool equipment, and the existing 200 amp circuit was sufficient for a charger. The only consideration is if there is room in your circuit panel to add an additional 220v breaker. The electrician will be able to confirm. And make sure you get multiple bids. I found prices varied quite a bit between contractors.

AZ owner here. Nemas get hot in the summer and suck ass. See if your panel can handle a 60 a breaker and install a legit Tesla universal charger .

I agree with this. We have a Tesla and have had other EVs, currently have an Audi and an adapter for the Tesla charger. First thing I did when I got the car is make sure the charging situation was working normally, and it was. Hard wired is the way to go with a 60 amp breaker if your scenario allows it. Mine does average about 236 volts times 48 amp = 11,328 watts , it’s a big difference from a 30 amp outlet that will give you max 240 volts times 24 amps = 5,760 watts. 20% from breaker max is US standard. Your HVAC units have a large breaker for start up, but generally are running much lower. You can look into soft-start additions so it doesn’t spike so high when initially turning on, especially if it is an older system. But rest assured, with a simple adapter your Tesla wall charger can charge any car.

An extension cable is not recommended. Most charging cables are 20-25ft long so the car charging port should be no more than 10-15ft from charger

Don't make a plan that includes an extension cord. Have the receptacle installed where you need it

We have the Tesla universal charger, it works with my wife’s ID4 and our Tesla. We used to have a juicebox charger but when they left the market it started to have issues with not completing charges, so we switched to the Tesla charger and have had no issues.

Install the 14-50. You probably don't *need* it, but if you're paying for the labor, go as big as you can. 14-50 can also be used for a lot of other things. Charge overnight when other house loads are low and it really won't matter.

Just talk to the electrician and get as many amps you can. They might surprise you. I would definitely find a way to get the plug and car closer together though - extension cords and EV charging are bad news.  We have a 14-50 outlet charging our EVs in the garage and it works fine. But if I were doing it now I would probably get a NACS charger since most new EVs will start coming with that.

The big benefit is when the EVSE craps the bed it's a 2-second diagnosis and swap.

Don't get a NEMA outlet. Instead, get a 60 amp feed to a junction box. From there, the electrician would feed into a wall charger. It's the vehicle that decides how much power to use.

Your plan sounds great except for the EVSE. Using the adapter will get old fast. It could fail or you could misplace it because you took it with you on travel. It's also an extra move to unplug the J1772 adapter. The charger port door keeps smacking into the adapter if you do it wrong. That can't be good for the door. Just buy a NACS EVSE and take it with you when you move. You can still advertise the home is wired EV ready. And even if you leave the EVSE behind, your buyer can use the adapter. There's literally zero reason not to go NACS. A hardwired EVSE is preferred. This is arguably a safer route with similar costs and faster speed charging. But you'd have to hire an electrician to remove the EVSE when you move instead of unplugging from a NEMA port.

Great point on the ACs. I have 2 as well that are from 2016. No issues charging two cars and running everything in the summer

Such unique situation

An RV extension cable works just fine. It’s what they are made for.

I had a 220v outlet installed in my garage last week. I use a 14-50 adapter from Tesla and it works great 7kW per hour gets me to 80% charge in around 2 hours.

I’ve not had a single regret with doing a 14-30. In my old house, 30amp was as much as I could do with my service. I’m new house I have gobs of extra capacity with 400a of inbound service but I stuck to a 14-30- I was comfortable wiring it, no real concerns about overheating the outlet with 24amps running through it, and I charge overnight on a schedule. When I get a second EV I’m likely to do the same setup on the other side of the garage.

You can purchase the Tesla Wall Charger which has both NACS and J1772 connectors. Also, I wouldn’t use an extension cable. Instead call and electricians for estimates. You can have the NEMA plug move further down the garage to make it closer to your car. I would personally go with the Universal Tesla Wall Charger.

14-50 receptacle on a post by the parking spot. I use a 14-30 and it’s not an issue with speed of charging for me. It’s useful for an RV to plug in too. See you next winter. Set up vehicle to home backup power too.

Install some clamp meters and measure how much current you are using in your worse case scenario...

OP here. Thanks to all for the replies. Based on input here I'm going to instead find a certified installer to install a Tesla Universal Wall Charger on the inner garage wall closest to where the car will be parked for charging, which should be maybe 5 or 6 feet. Hopefully the breaker box will support a full 60 amp circuit, but if not I'll go with a 40 amp. I night revisit this if the breaker box won't support at least a 40 amp circuit (meaning a 32 amp sustained charging load). Thanks again for all of the helpful replies!