Installing NEMA 14-50...

NOOOOOOOO

If something goes bad in the smaller circuit (air handler motor burns up), the smaller wire would go up in smoke and burn your house down.

 

hire a licensed electrician!

 

You should look at an electrician. Your situation isn't necessary an easy install. If it was just adding a breaker and your comfortable with electricity, go for it. But this case appears to be a bit more tricky. A few hundred $$ to ensure safety would be well spent.

Where is the inside panel? Just on the other side of the wall? Or a long ways away?

They *may* be able to add another sub-panel next to that outside box and split off the HVAC circuits and get a charging circuit as well.

 

I think this panel is for your electricity company only. The panel in the garage is from where all distributions should be made.

 

As the others stated, what you suggest is definitely a bad idea. However, it also appears that you only have 100amp service, so you may not have the capacity to add a 50amp outlet. Especially if you have an electric range and/or dryer. The electrician will have to run a load calculation to see if you have the capacity for what you want to install.

 

TEsla's website offers suggestions for electricians in most areas. I just used this to contact an electrician about getting an outlet installed at my home. I recommend using it and contacting them. The one I contacted has installed multiple Tesla outlets for people and was VERY familiar with the options for charging and has been very helpful.
here is the link: Find an electrician

 

Agree that left is utility. That box is yours.

Does look like there are slots on the top. Should be obvious from knockouts on the safety panel that was removed.

s there any label on panel capacity? That still may be a 100A panel, in which case a load calc would be important. I cannot locate any images that match that panel combo on the internet.

Also, there is an electric codes for max number of switches to disconnect the house. I don't know what they are. Since you don't have a main breaker, that would also be a consideration.

 

that 50 and 15A are already slim breakers. Is that 100Amp coming in all you have to the house or is that just the sub panel for the AC? I could walk you through the install if you need.

 

Just because you can it doesn’t mean that you should. Again, it appears that you have 100amp service and I would be very wary about adding a 50amp circuit to that without doing some load calculations to make sure you have that capacity. You might save a few hundred dollars with the DIY approach only to cause a fire and cost yourself way more than that in the end.

 

Try asking the question here:
Home Improvement Stack Exchange

 

Put another breaker on the top and be done with it. Let me know if you need a parts list. Take a picture of the area where it's going and I'll MS paint that *sugar* for you.

 

Sugar? Really?

 

Please be aware that in most places in the US you are required to get a permit and inspection for the work you’re doing, and many places require that the work be done by a licensed electrician. If you fail to follow the requirements then if anything happens to your house your insurance company can attempt to shift liability on to you, even if the problem wasn’t related to the work.

 

OR you could just tap into your electrical panel like all other sane people . it would cost a bit extra but it will be up to code instead of what you've shown in pictures. btw, there were already threads on how to do these runs on this and model3 owners club you might want to search for.