Anyone have two chargers or use load sharing?

[Maquis]

Got it. So did the guy in the youtube video I watch do it wrong by splicing the wires and not doing a subpanel with breakers? If I do this, can I then use 8/3 romex via conduit or do I still need separate wires for my new run to the 2nd charger?

I didn’t watch the video, but it sounds like it’s wrong. 8-3 Romex is only good for 40A (32A charge rate). If you are going to install 14-50 receptacles on 50A breakers, it’s not sufficient. You need either #6 Romex or #8 THHN in conduit. Putting Romex in conduit does not increase its ampacity.

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[jefro]

" Power Sharing allows you to connect two or more Wallbox chargers (up to 25 total) on a common electrical circuit and dynamically balance the power available to each charger " https://support.wallbox.com/wp-content/uploads/ht_kb/2022/07/Power-Sharing-Smart-US.pdf

https://suncountryhighway.ca/wp-content/uploads/2018/10/SCH_Share2_Brochure.pdf

https://store.clippercreek.com/Share2-HCS-50-40-Amp-Level-2

https://simpleswitch.io/

https://www.chargepoint.com/blog/charge-more-evs-power-management

https://www.tesla.com/support/gen-3-wall-connector-power-sharing

https://support-emobility.enelx.com/hc/en-us/articles/360002651411-What-is-Load-Sharing-

" Former 625.14 has been revised and relocated to 625.41 as a result of Article 625 being reorganized. A new last sentence that includes provisions for an automatic load management system has been added to 625.41. The maximum electric vehicle supply equipment load on a service and feeder shall be the maximum load permitted by the automatic load management system. This revision provides relief from service upgrades in some cases, but an automatic load management system has to limit the load on the service to its capacity. "

 

[FlasherZ]

They cannot share a single branch circuit. They can share a feeder that has less capacity that the sum of the two EVSEs, and only one needs to be included in any load calculation.

That's from the newest code. OP may be using an older code. In my county, they specify 2008 still.

 

[FlasherZ]

I did some digging on my install for the first Juicebox. The invoice lists "RMX 83 8/3 W/G ROMEX WIRE," so it is definitely 8/3 Romex. Although the picture shows individual wires in conduit, the entire run is about 30 feet and the first half of it from the panel to the back of my garage (all inside) is just the cable, then for the second half there is a junction box and he runs the individual wires along the wall to the charger. Below is a pic of the junction box. Is this still a problem? And if it is, how big of an issue is it? I would strongly prefer not to redo this work.

Well, in my opinion, they should nuke that requirement that you use the 60 degC table, because modern NM cable is just as good as THHN, but the CMPs don't feel that way. So will it work? Yes. Will it work safely? Yes. Is it code compliant? No, and that means if a buyer's inspector sees it when you sell your home, you may be required to fix it; you might have insurance implications if your insurance company is aware of it.

Answers to your questions:

Plan is to splice into the existing 8/3 cable a few feet from the panel and make the new run off of that. i bought these tap connectors to make the connection, similar to what the guy does in this video. I was going to just going to stick the cable into conduit for the entire run (especially outside), but it sounds like I may need to run individual wires rather than the NM cable. The conduit would run from the junction box, yes. The placement of the junction box pictured below is not ideal for me, so I think I would install a new junction box close to the panel. I did not plan to move the existing unit to hardwire, does that make a difference?

Those are called "Polaris connectors" and they're good for that application. You can either go with independent #8 wires, or if you really want to use NM cable (Romex), you'll have to go up to #6. Note that conduit fill rules change as well if you want to put NM in conduit, and you have to use the diameter of the cable. If you use conduit, just use individual wires.

(I hope a licensed electrician didn't stuff your #8 Romex in conduit like that... that's not what I would expect to find from a professional.)

 

[FlasherZ]

So here's the concern with sharing the breaker using Polaris connectors - with continuous loads like this, you want to minimize the number of connection points which are typically the places where a lot of heat can be generated (loose connections, etc.). So the CMPs really want you to use a small panel with multiple breakers, one for each system and as @Maquis notes, you only count one in your load calculations.

Older code cycles will let you use those Polaris connectors. Do you have inspections? You might call your inspector and ask what he expects for your jurisdiction.

 

[FlasherZ]

" Power Sharing allows you to connect two or more Wallbox chargers (up to 25 total) on a common electrical circuit and dynamically balance the power available to each charger " https://support.wallbox.com/wp-content/uploads/ht_kb/2022/07/Power-Sharing-Smart-US.pdf

https://suncountryhighway.ca/wp-content/uploads/2018/10/SCH_Share2_Brochure.pdf

https://store.clippercreek.com/Share2-HCS-50-40-Amp-Level-2

https://simpleswitch.io/

https://www.chargepoint.com/blog/charge-more-evs-power-management

https://www.tesla.com/support/gen-3-wall-connector-power-sharing

https://support-emobility.enelx.com/hc/en-us/articles/360002651411-What-is-Load-Sharing-

" Former 625.14 has been revised and relocated to 625.41 as a result of Article 625 being reorganized. A new last sentence that includes provisions for an automatic load management system has been added to 625.41. The maximum electric vehicle supply equipment load on a service and feeder shall be the maximum load permitted by the automatic load management system. This revision provides relief from service upgrades in some cases, but an automatic load management system has to limit the load on the service to its capacity. "

Once again, you're citing the completely wrong information.

He's asking about how to connect the boxes, not load calculations.

The web site for these boxes don't always address that.

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