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NEMA 14 - 50 or Wall charger

Gorkhe

Member
Aug 20, 2020
23
5
GA
I got a MX and now trying to figure out the home charging. I am using MX for regular commute. Currently with Covid, my usage is minimal.
I am trying to decide between getting a NEMA 14 - 50 outlet and using the mobile charger vs having a wall charger (Gen 3).
Talking with the electrician, he recommended adding a 50 amp circuit. Looking at the charge rate, it looks very comparable.
Mobile charger would charge at 20 mph where was wall connector would charge at 25 mph.
With wall charger, I would have to pay for wall connector + installation with NEMA outlet, I would just pay for outlet install.
So I am debating if $500 extra is worth paying if I get similar charge rate with mobile connector.
So folks out here, what is our experience with using mobile charger with NEMA 14 - 50 vs wall connector.
Please help me make the decision.
 

P85_DA

Supporting Member
Apr 25, 2015
4,171
2,872
CA
Wall connector is good if u want to keep the mobile connector with you In car ...previously Tesla’s could charge at a higher rate ...ie my first Tesla could charge up to 80amps ...my current X can go up to 72a ...that’s where the wall connector had an advantage as 14-50 cannot charge that high ...newer Xs are limited to 48a charging so not much difference in charge rate ..the wall connector also allows sharing of circuit across multiple wall connectors if you have another Tesla in your future ..otherwise 14-50 is good just get a high quality plug
 

bob_p

Active Member
Apr 5, 2012
3,594
2,748
We installed two Wall Connectors (HWPCs) for our S 100D and X 100D - both charging at 48A (one is on a 60A circuit, the other on a 100A circuit).

When we installed our solar panels and PowerWalls, we had the electricians add a 14-50 outlet to the solar/PW system, to use for emergency charging during an extended power outage (hurricanes) - and have a Tesla 50A connector for that outlet.

As it turned out, it was fortunate we did that, because we purchased a new RV several months ago, and now use the 14-50 outlet for providing power to the RV when it's at the house before or after trips.

Having a 14-50 outlet provides flexibility to not only charge Tesla vehicles - but also to provide power for other uses (which we didn't anticipate when we had the outlet added to our garage).

A 14-50 outlet will be limited to 40A of charging, which is less than the 48A which is the limit for current production Tesla vehicles. For overnight charging, the difference between 40A and 48A isn't significant - 40A should be able to recharge a vehicle overnight.
 

nobznss

Member
Sep 10, 2017
182
111
Utah
Honestly, my approach was to use the NEMA 14-50 because it's more generic. I've got 2 other EV's and as a hard wired charger can only be used for the Tesla, I figured I'd have more flexibility leveraging the mobile charger. Sure it's slower, but not THAT much slower.
 

teethdood

Member
Jan 30, 2017
388
519
Visalia, California
I went through all 4 scenarios below:

1) NEMA 14-50 with mobile connector. The mobile connector is short and we have 2 MXs, so my wife and I constantly have to remember whose day it is to charge. We got tired of that, so when we got our reward referral HPWC, we pigtailed it to a NEMA 14-50 connector to use the same plug, but now we can park anywhere and can still charge using the 20' connector. Then we moved.
2) Our new house has 2x200A service, so we removed the pigtail, had electrician hardwire HPWC in to 100A breaker, could charge both cars at 72A. Sweet! Until we had solar panels installed. They had to downgrade one of the 200A circuit to 150A so they could hook the solar panels to it. Had to remove the 100A HPWC line, went back to a NEMA 14-50 with HPWC pigtailed.
3) HPWC pigtail started to burn up. Here's the thread on that:
HPWC fried wire. Still usable?
4) Got another HPWC. We hardwired it using a 2-AWG wire to a killswitch, which is wired to a 50A breaker. We are now using it at 40A charging, but with 2-AWG wire so no risk of frying the wires.
 

Terthen

Member
May 9, 2016
346
200
San Diego
We have 2 nema 14-50 outlets, one on each side of garage. I went with this because for home use it's plenty fast and more versatile for the future. Works great, haven't myself really figured out any other benefits of wall charger other than looks and slightly faster charge speed.
 
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