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Tesla's Wall Charger
- Thread starter joeybatts
- Start date
WilliamG
Hinge Fanatic
In the manual it explains there is a small dial that needs to be changed depending on the size of the circuit breaker you have at the other end
dk10438
Member
page 21 of instruction manual
there's a rotary dial that needs to be set correctly based on the max load of circuit, ie 80% of circuit breaker. For example, if the circuit breaker is 60A then rotary dial should be set to position 9 with a max output of 48A.
there's a rotary dial that needs to be set correctly based on the max load of circuit, ie 80% of circuit breaker. For example, if the circuit breaker is 60A then rotary dial should be set to position 9 with a max output of 48A.
AlanSubie4Life
Efficiency Obsessed Member
The Wall Connector appears limited to 9A. The voltage is a bit low but is probably fine...depends on the electrical service type.
Also, can you provide a picture of the voltage when the car is drawing 0A (set charge limit below current level)? Might only go as low as 2A. Doesn’t matter. This will identify whether the voltage is drooping (a lot) under load.
What is your wire gauge? What type of wire? How long a run? How many amps is the breaker? These things guide how to set the Wall Connector dial.
More info is needed.
Last edited:
dhrivnak
Active Member
OR it is detecting a large voltage drop as I would think you should have 240 volts not 211. If the car detects a voltage sag it will cut back the current. You may have a lose connection somewhere.
I can't seem to edit, but Wall Connector shows that 208V feeds are fine, so the voltage is no concern.
AlanSubie4Life
Efficiency Obsessed Member
Also, assuming you have 208V service, you won’t get this range per hour. All the values that Tesla provides in their table have to be reduced by the ratio of 208/240, even if you have a 60A circuit charging at 48A.
Not that it matters. It’ll be fine assuming you have all the wiring right, once you get the WC correctly configured.
Edit: looks good! Your number will be lower than the one in the Tesla table due to the voltage difference.
So if I put in a greater amp breaker will I be able to get better range per hour?
AlanSubie4Life
Efficiency Obsessed Member
You would have to have the wiring to support it. You need 6/2 in conduit (not Romex) to support 48A continuous on a 60A breaker I believe (assuming a short run). You can’t just install a bigger breaker.
dk10438
Member
AlanSubie4Life
Efficiency Obsessed Member
Glad it is working for you, you are sure you have 6AWG wire, right? Or 8AWG I think is ok for 50A (40A continuous) as well...
RScottyL
Member
Correct!
IIRC, I think the standard range Model 3 gets 40A maximum and the Long Range/Performance gets 48A!
AlanSubie4Life
Efficiency Obsessed Member
Just went through this..
6/2 romex can handle 44 Amps Continuous, 55 Amp max. This is ok if you charge at 40 Amp with a 50 Amp Breaker. Wire should have more capacity than breaker. If you use 6/2 for 48 Amp charging, the wire can overheat. No Bueno.
If you want to charge at 48 Amp, you will need to use 4 gauge with a 60 amp Breaker wired straight to the wall connector. Can't use NEMA 14 50 connector as it can only max 50 Amp. 4/3 Romex can go 70 Amp max and can easily and safely handle 48 Amp charging. Just use 2 of the 3 wires in the 4/3 Romex. If you want to use Romex, you will not be able to find 4/3 at home depot. You will have to go to an electrical supply store and be sure to pre-bend it when you install. Very tough to bend if your connector is already mounted.
Good luck and don't burn your house down.
6/2 romex can handle 44 Amps Continuous, 55 Amp max. This is ok if you charge at 40 Amp with a 50 Amp Breaker. Wire should have more capacity than breaker. If you use 6/2 for 48 Amp charging, the wire can overheat. No Bueno.
If you want to charge at 48 Amp, you will need to use 4 gauge with a 60 amp Breaker wired straight to the wall connector. Can't use NEMA 14 50 connector as it can only max 50 Amp. 4/3 Romex can go 70 Amp max and can easily and safely handle 48 Amp charging. Just use 2 of the 3 wires in the 4/3 Romex. If you want to use Romex, you will not be able to find 4/3 at home depot. You will have to go to an electrical supply store and be sure to pre-bend it when you install. Very tough to bend if your connector is already mounted.
Good luck and don't burn your house down.
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