Circuit for Tesla Wall Charger

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I'm trying to decide whether to recommend one 100a circuit or two 50a or 60a circuits, and whether to suggest he forgo Wall Connectors and use standard receptacles?

Is the only advantage of the Wall Connectors for load management? Would one Wall Connector and one standard receptacle (on separate circuits) be a waste?

I believe he's looking at the Model 3.
 
His wanting shared chargers is a good idea if he plans on using more than one ...lol... the Tesla design is four wall units can share one breaker through the system due to the wall units communicating with each other. They have an installation video... which has been making its rounds with some people wondering why it cannot take more spots...
the reason for using the Tesla wall box rather than a normal outlet is it can then read exactly which type of car it is charging, provide quick charging or trickle charging, and do a load of other stuff, along with sharing the breaker with other such units.
 
I just found out that the current model of the Tesla Mobile Connector (Gen 2) is limited to utilizing a 40A circuit (EVSE current of 32A). So for the currently available Model 3 cars (which can charge at up to 48A), the speed bump of going to a Tesla Wall Connector on a 60A or greater circuit is 50%.

Cheers, Wayne
 
Long Range Model 3s (*) have an onboard battery charger than can use up to 48A continuously.

The car comes with a Generation 2 Tesla Mobile Connector that can use at most a 40A circuit. When that EVSE is connected to a 14-50 receptacle, a connected car can only charge at 32A continuously.

If a Tesla Wall Connector is installed on a circuit that is at least 60A, then a connected Long Range Model 3 can charge at its full 48A capacity.

48A / 32A = 1.5, or a 50% increase in charge rate. [Except when the battery is close to full and the car's onboard charger is limiting the charge rate to below 48A.]

Cheers, Wayne

(*) The only Model 3s currently being sold. In the future there may be Standard Range Model 3s, which have a smaller battery and only a 32A charger.
 
As of now, the plan is to install two 60a-capacity circuits, one with a Wall Connector and one with a 50a receptacle (on a 50a breaker). My question is whether a single Wall Connector is a waste of money in this instance.
 
My own understanding of the Tesla system, and it is mainly from watching the wall and solar systems rather than the car system, is the one unit is not a problem but that you may want to run a 1/2 inch conduit from one outlet to the other for pulling a control wire later when you replace the socket with the other wall outlet from them.., although they may end up changing to wireless eventually...
as I understand it, the wall unit from them has sensors in it to actually change the charge as needed by the car, and do upgrades as needed as well... not too sure as Tesla reports certain things in media but the Tesla owners groups say other things.

Really wish they would set up one standard for electric cars charging, but BP could not get the various groups to standardize so how are we to do it?
 
Adamjamma said:
. . . but that you may want to run a 1/2 inch conduit from one outlet to the other for pulling a control wire later when you replace the socket with the other wall outlet from them..,
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From what I've read, the only reason to interconnect two Wall Connectors is to allow them to share a single circuit.
 
LarryFine said:
As of now, the plan is to install two 60a-capacity circuits, one with a Wall Connector and one with a 50a receptacle (on a 50a breaker). My question is whether a single Wall Connector is a waste of money in this instance.
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Only the client can decide whether it is worth the money or not. The Wall Connector on a 60A circuit will let a Model 3 Long Range charge 50% faster than using the Mobile Connector on a 14-50 receptacle.

Does the load calc for the dwelling support the additional 11.5 kW continuous load?

Cheers, Wayne
 
Adamjamma said:
Really wish they would set up one standard for electric cars charging, but BP could not get the various groups to standardize so how are we to do it?
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There is one dominant standard for supplying AC to electric cars in the approximately 1 to 20 kW range. That's J1772. Everyone follows it electrically, and almost everyone follows it mechanically. Tesla decided they knew better and uses a different mechanical connector, but there are mechanical adapters available to go between Tesla J1772 and Regular J1772.

There are 3 standards in the US for supplying DC to electric car batteries (an off-board charger) in the approximately 20 to 100 kW range, namely Chademo, SAE Combo, and Tesla. None of these are interoperable, although Tesla has an adapter to let their cars use Chademo stations.

Cheers, Wayne
 
LarryFine said:
From what I've read, the only reason to interconnect two Wall Connectors is to allow them to share a single circuit.
Click to expand...

but when you have 4 wall boxes, the maximum to share info, they are not on one circuit but more than one, as I read the multi box guides from them... Perhaps in the USA it is different from the UK? But it requires a minimum of two breakers in UK, for more than two boxes.. and my understanding is they talk to each other to reduce the loads on the main breaker by sharing and monitoring the power coming in... not sure as they list a 4 box limit and that to me would be a per circuit rather than per system because of the way they are pushing for utilities etc to look at them in future... they actually are supposed to be making a police car concept for NYC right now... How would it work if you had to only plug in 4 cars per department? at any one time?

It gets confusing reading their paperwork and watching their videos over certain things they are doing as they seem to talk about use for stuff they never seem to bring out for real world...
 
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