Best EVSE Setup for Two EVs on One Circuit?

[Al_V]

I'm aware of this, so the setup would need some power sharing/limiting capability.

(2) 40 amp chargers could conceivably share a 100 amp circuit.
However, it is probably/maybe a code violation in one way or another.
I am far from an expert on NEC.

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[Adventureboy]

(2) 40 amp chargers could conceivably share a 100 amp circuit.
However, it is probably/maybe a code violation in one way or another.
I am far from an expert on NEC.

You can do this with 2 50 amp circuits coming off a 100 amp subpanel. Honestly, I'd probably do a 60 amp and a 40 amp circuit with a 48 amp and 32 amp EVSE respectively. The Lightning uses more power than most other EVs.

 

[flyct]

You can do this with 2 50 amp circuits coming off a 100 amp subpanel. Honestly, I'd probably do a 60 amp and a 40 amp circuit with a 48 amp and 32 amp EVSE respectively. The Lightning uses more power than most other EVs.

^^^ Exactly!

That is what I would do especially if I already had a 100 amp EVSE and the electrician had run a neutral to the existing 100 A EVSE.

Since I only have a single Tesla Wall Connector wired to a 60 circuit then Daisy chaining 2 Wall Connectors is the most logical solution for me. I have 2 Teslas and a Lightning. Right now I unplug one car when it's charged and plug the another in. It's a small pain in the A$$. Automatically being able to charge 2 at once should be slower that a 48a and 32a but I wouldn't have to remember to unplug and move it to the other car.

Fy friend has a new Universal Wall Connector that he hasn't installed in his house boing built. His partner doesn't want anything Tesla in the house and told hi to sell te Wall Connector. I may make him an offer to buy it at a discount since I would ot have a warranty as a second owner.

 

[Monkey]

Im also curious about this, but I currently have a single 100 amp circuit for the lightning with CSP. If/when we get a second EV, it seems like it may be more cost effective to share this circuit than run a new one, although it isn’t far. I don’t really need the full 80amps either for the Lightning.

Two tesla wall connectors make sense with this setup too? Looks like you could set up each to charge at 48 amps? Or is the 100 amp circuit a problem?

As of last October, Tesla was still selling the 2nd-generation Tesla Wall Connector through their commercial sales and I believe they still do. The 2nd-gen is/ was their recommended unit for commercial destination chargers and you can share up to 5 of them on a single 100A circuit. The new 3rd-generation chargers can share a single 60A circuit or can be load-balanced on individual circuits so they don’t over-draw your service.

Grizzl-e was supposed to be coming out with a higher-powered version of their dual-charger that would install on a 100A circuit, but that hasn’t materialized just yet. I know their current dual-charger has been a little problematic for some people.

But if the wire run from the panel is short, you’re probably best off just running a separate circuit for a second charger.

 

[pjell]

As of last October, Tesla was still selling the 2nd-generation Tesla Wall Connector through their commercial sales and I believe they still do. The 2nd-gen is/ was their recommended unit for commercial destination chargers and you can share up to 5 of them on a single 100A circuit. The new 3rd-generation chargers can share a single 60A circuit or can be load-balanced on individual circuits so they don’t over-draw your service.

Grizzl-e was supposed to be coming out with a higher-powered version of their dual-charger that would install on a 100A circuit, but that hasn’t materialized just yet. I know their current dual-charger has been a little problematic for some people.

But if the wire run from the panel is short, you’re probably best off just running a separate circuit for a second charger.

Thanks for this. I wasn’t aware of the 2nd gen and the differing specs, I found them here. I’ll probably run the numbers to compare when we get the second vehicle.

 

[mtg]

I didn't see if this was already mentioned, but Lectron has a socket splitter for this kind of use case:
https://ev-lectron.com/collections/socket-splitter

 

[SmoothJ]

Really pricey, but I heard of wattzilla.

https://wattzilla.com/index.html

I heard that OpenEVSE might be working on something, but I haven't seen any updates.

https://www.openevse.com/

 

[SmoothJ]

(2) 40 amp chargers could conceivably share a 100 amp circuit.
However, it is probably/maybe a code violation in one way or another.
I am far from an expert on NEC.

You can do this with 2 50 amp circuits coming off a 100 amp subpanel. Honestly, I'd probably do a 60 amp and a 40 amp circuit with a 48 amp and 32 amp EVSE respectively. The Lightning uses more power than most other EVs.

2x 40A is fine for 100A circuit
2x 50A needs a 125A circuit.

For continuous loads (lasting 3 hours or more), you should not load a circuit breaker to more than 80% of its rated capacity to protect the circuit and prevent overheating.

Technically some EVSEs have this setting already there, however some don't.

 

[chl]

Hi all,

Background info on getting the Lightning, can skip and just go to the next section, but just in case:
We have a 2022 Mach-e and a 2023 F-150 PowerBoost. My PowerBoost is a lease and was due to go back in July, but my salesperson who knows I have been considering a Lightning called me today and said they need to sell another Lightning before end of quarter to meet one of Ford's requirements and they are willing to waive my remaining PB lease payments and get me a Lightning Platinum that is damn near perfect, power running boards, spray in bed liner, everything I want except color, and my monthly payments go down compared to the PB.

EVSE Question:
I am moving ahead with the deal, but our garage is, frustratingly, about 3 inches too shallow to fit an F-150. So our Mach-e parks and charges, but the Lightning will have to live outside. I don't drive a ton every week which is part of the appeal of dropping the PB for the Lightning, but I do want to make charging easier.

What is the best current option for possibly adding a second EVSE to our existing circuit? I don't need to charge daily on the Lightning, but it will be a bit of a logistical headache to get the Lightning in place to charge where the MME is. It's a loooong run from our circuit panel to the garage, so would like to avoid running another circuit.

I searched and saw a couple posts, it looks like LightningRick has something he uses potentially with JuiceBox Pros, and I saw that the new Tesla Combo EVSE allows daisy chaining which may work well.

We currently have:
50 Amp Circuit
Chargepoint Home Flex

I am fine to sell the ChargePoint if we need to move to a better overall system.

Thanks for any ideas, this space moves fast so looking for the best of what's out there now.

Perhaps a J1772 extension cable might work to reach your outside truck from the existing EVSE location?

Assuming you won't need to charge both vehicles at the same time and they could time share the EVSE.

The extension cable might be less expensive than replacing your EVSE with a TESLA box daisy chain, or running a whole other circuit for another EVSE.

 

[chl]

My wife has a Wrangler 4xe so we have one 50 amp circuit run to our garage for that. I bought the Lectron Socket Splitter and plugged that into the wall outlet. Then our Grizzl-e charger is plugged into one side of the splitter, and I use the Ford mobile charger with the NEMA 14-50 socket attached to plug into the other socket. Whenever the Wrangler is done charging (usually takes about 2 hours), the splitter automatically switches over to my Lightning and it tops off overnight. It's worked exceptionally well in my situation.

https://ev-lectron.com/collections/socket-splitter

Interesting.

I did not see it mention anything about GFCI provisioning which is now required for plug-in connection of an EVSE according to the recent NEC code, which may have been adopted by the local jurisdiction where the installation is being done.

If GFCI is required, some EVSE models have issue with them since they already have internal GFCI.

So if choosing this option, check the EVSE documentation and the codes or have an electrician do so.

 

[chl]

(2) 40 amp chargers could conceivably share a 100 amp circuit.
However, it is probably/maybe a code violation in one way or another.
I am far from an expert on NEC.

If hardwired: total if both on at the same time would be an 80A continuous load, so OK on a 100A circuit wired and breaker protected correctly, I believe.

 

[bosox8]

I understand. We bought 2 Teslas before he went crazy. Last week we seriously looked at Mach-e to replace one our Teslas. We ended up swapping our 2023 Lightning Lariat for a new 2024 Lightning Platinum instead. . As much as we wanted to dump the Tesla for political reasons the Mach-e lacked the utility we needed and it was more difficult to get in and out of.

It reminds me of a friend who was a WW2 veteran. He wouldn’t ride in my Honda because Honda was made by a Japanese manufacturer.

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