If you know, what size circuit breaker and gauge of wire are you using on the Gen 3 wall connector? (ie 40amp breaker, #8 gauge or 8/2 wire)
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Wall Connector Gen 3,
- Thread starter lachambers
- Start date
JACMS3
Member
If you want to charge at 48 amps, you need a 48/80%=60 amp circuit. Assuming you are using NM wire (not individual 90*C wires in a conduit), you'll need 4 gauge. 6 gauge NM is good for a 55 amp circuit, not 60.
BTW, I don't think I've ever seen 4/2, so you'll have to spend a little more for 4/3. At least you'll have the neutral if you ever decide to switch to a NEMA 14-50 outlet.
BTW, I don't think I've ever seen 4/2, so you'll have to spend a little more for 4/3. At least you'll have the neutral if you ever decide to switch to a NEMA 14-50 outlet.
Per code I used red and black 6 AWG THHN wire (https://www.wireandcableyourway.com/6-awg-thhn-building-wire.html) for the hot wires along with 10 AWG THHN for the ground inside of 3/4" metal conduit connected to a 60 amp two pole breaker. Works great.
Watts_Up
Well-Known Member
You need also to consider the length of the conduit line to determine the wire gauge.
I would recommend looking at this web site: Build My Own Cabin
I would recommend looking at this web site: Build My Own Cabin
Thanks guys much appreciated.
I live in south Florida and have to run the Romex through the Attic about 90 feet from service panel outside to gen 3 wire connecter in garage .
Is there anything wrong with just installing 8/ 2 Romex with a 40 Amp 2 pole breaker?
I understand that I won't get full charging amps but I won't be using it for commuting and very little weekly driving. Thanks for your thoughts.
I live in south Florida and have to run the Romex through the Attic about 90 feet from service panel outside to gen 3 wire connecter in garage .
Is there anything wrong with just installing 8/ 2 Romex with a 40 Amp 2 pole breaker?
I understand that I won't get full charging amps but I won't be using it for commuting and very little weekly driving. Thanks for your thoughts.
Why run 8/2? At least use 6/2. The cost difference is small and could charge at 40 amps with a 50 amp breaker.
Ok thanks
.. I was thinking of doing that but was worried about the total amps with a 200amp service panel. I might want to add at a later date a tankless waterheater.
.. I was thinking of doing that but was worried about the total amps with a 200amp service panel. I might want to add at a later date a tankless waterheater.
Thanks MY-Y, I did exactly what you suggested. So glad you told me to up size the wire and CB.
Thanks so much
Hey everyone, last month I had an electrician install the Tesla wall connector (latest version). A few weeks ago I noticed in my wall panel that they appear to have used two 50 amp circuit breakers …. I’m presuming in parallel to the connector. See pic. I’ve called another electrical company to come out this week to downsize them to two 30 amps and check the wire gauge to make sure it’s to code. Just wanted to check to see if I’m missing something. Thanks!
Thinking about it more. They used a spot that was for an old water heater and probably just left the breakers that were already there. Still to me this looks like 100 amps of potential current going to the charger which makes me nervous unless I’m misunderstanding.
Thinking about it more. They used a spot that was for an old water heater and probably just left the breakers that were already there. Still to me this looks like 100 amps of potential current going to the charger which makes me nervous unless I’m misunderstanding.
What you have installed are several 120/240V double pole circuit breakers: 35A (AHV Main House), 50A (Tesla Charger), 30A (Dryer). The old water heater would have been 240V and 30A. As long as the electrician who installed the Tesla Wall Connector did a load calculation that showed sufficient capacity for a 50A versus the old water heater's 30A 240V circuit all is good. The assumed new wiring for the Wall Connector would have to be sufficient for 50A for an electrician to install a 50A breaker. (When wired for 240V/50A the double pole circuit breaker is connected to two separate 120V hot leads, one on each side of the circuit breaker panel. The two hot leads are 180 degrees out of phase, this is how you get 240V in a residential application. The circuit is rated for 50A.)
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Awesome. Thanks. Very helpful. That makes me feel much better. I’ll still have the guy come out and check the wiring just because I have another job for him too. I’m just glad it’s not 100 amps.
That makes me think I’ve got my Tesla connector set wrong then. I have it set for 60 amps max. Will need to dial that back to 50 I guess.
When the electrician comes I’ll see if they can do 60 amps.
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Yes, when installed on a 240V/50A circuit to be correctly configured the Tesla Gen3 Wall Connector must be setup for a 50A circuit, will enable charging at 40A.
This is a different installation from your setup. The OP's electrician already installed a 50A circuit. Per the national electrical code the Wall Connector needs to be configured for the 50A circuit. (I.e. when charging on a 50A circuit the maximum charging amperage must be limited to 80% of 50A (40A.)) Charging at 48A requires a 60A circuit, that is not this setup.
I can see where someone might think that because they look like two 50 amp breakers in parallel, but in reality they are in series. All the current that flows through one also flows through the other. As mentioned above, it's a 50 amp circuit.
I have a garage 50-amp sub-panel with a 40-amp circuit for the Gen3, leaving some capacity for garage door openers and lighting. With the Gen3 set to charge at 32-amps, I get plenty of charging - about 29 miles per hour. It's no big deal not to have 50-amps of charging.
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