It sure looks that way. I'm confident the electricians will get it resolved. It would help if the manual didn't contradict itself.
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Gen 3 wall connector power sharing
- Thread starter a1machinista1
- Start date
It sure looks that way. I'm confident the electricians will get it resolved. It would help if the manual didn't contradict itself.
There's not really any contradiction in the manual. If you put a subpanel in, you STILL need individual branch circuits off the subpanel. If you don't need a subpanel, for instance if your panel has lots of open breaker spaces and is located close to where the HPWCs will be installed, you need branch circuits for each HPWC.
I was originally looking the the "without a sub panel" schematic and I was "assuming" that the connectors were daisy chained off the main feed. But looking at it again I can see that it may mean individual 60a breakers circuits?
To me the concept of "tying" the two connectors together on the same circuit seems reasonable so to the fact that "if the software works as designed" that the two will never pull more than 48a (60a) together. And each connector has access to 48a (60a) individually. I'm not by any means an electrician and just glad our electrician is accepting of me questioning the install. Hopefully after we talk tomorrow I will have additional information that I can share here to help others through this process. I will also mention to him that he should be able to access file available to licensed electricians from Tesla.
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It >does< mean individual 60a circuits. Those upside down U's are circuit breakers.
In theory there's really no danger in having multiple HPWCs hanging off one breaker. I don't have a clue why they say to do it that way. Even if the HPWC's lose their minds and ask for more than 60 amps combined, the breaker will trip and your house won't burn down.
I also think the repeated use of 60A on page 24 is misleading. I don't think there's any requirement that the shared power supply and wiring all be rated to 60 amps. I imagine it would be just fine sharing a 30 amp circuit too(with 30 amp breakers and wiring all around). Maybe Tesla is worried some numbnuts will put two thirty amp circuits hanging of a single 60 amp breaker and burn someone's house down by telling the HPWC master that its got 60 amps to play with.
Unfortunately, after my installation of two of these BEFORE power sharing was available, I did a software update and apparently ended up with firmware that couldn’t/wouldn’t download new firmware and always reported they were up to date.
I just successfully updated using the manual/offline update procedure outlined on various Tesla support pages and now have power sharing enabled.
Happy to have half-speed charging behind us!
Mind sharing which version # you were "stuck" on?Unfortunately, after my installation of two of these BEFORE power sharing was available, I did a software update and apparently ended up with firmware that couldn’t/wouldn’t download new firmware and always reported they were up to date.
I just successfully updated using the manual/offline update procedure outlined on various Tesla support pages and now have power sharing enabled.
Happy to have half-speed charging behind us!
if you only have one car plugged in, will ituse the full allowed amperage to charge that single car at max speed?
Also, if you have 2 cars plugged in, does it have any intelligence to determine what car is done charging? Or does it work in half capacity if 2 cars are plugged in regardless of SoC?
We just ordered our second Tesla, so trying to figure this all out.
The WCs communicate with each other based on actual current draw. If two cars are plugged in and one is not charging the other will get the max available. So 2 WCs with 60A breakers (48A max continuous) on a 100A subpanel (80A total max continuous), one car plugged or 2 plugged with one charging will get 48A. 2 cars plugged and charging will split the 80A (from what I’ve seen it isn’t perfectly 50/50 but close, regardless of relative SoCs)
I gotta say I was 'shocked' to see that power sharing can even be configured on differently wired/breakered HPWCs, so you could have one wired for 48 amps while another is wired for 12, and they won't ever try overdrive the 12 amp circuit. I know the software to do that is trivial, but it seems like a very uncommon use case.
www.tesla.com
Wall Connector Power Sharing | Tesla Support
With Power Sharing, you can allow up to six 3 Wall Connectors to share power and charge multiple vehicles at once. Learn how to set up and troubleshoot Power Sharing.
Update: The Head Electrician came over about 10 days ago and we had a 30 min discussion about the install. He took some notes and I sent him another link to the Tesla install guide. He was scheduled for vacation last week and said he would contact me Tomorrow when he returns to work. In the meantime we picked up our MY so I reduced both HPWCs to 30a and am currently charging our MY on the "Follower" HPWC. We won't get our MS until ? ( Current EDD 10/12-11/1) so we have time to spare. Will update as the situation progresses.
Update: The owner sent me an email stating that they think the best way to move forward is to install a sub panel and wire each HPWC to its own breaker. Although they believe the current wiring is acceptable and I agree to a certain point. They will be coming over this week to revamp the wiring. I have agreed to pay for the materials (sub panel and breakers) and half of the additional labor. The owner made it clear to me that I could name my terms on this, but I consider the parts and half labor to be fair. As a whole I am happy with what the end result will be. I could have made a stink and possibly had no additional costs but all said and done we will have paid $1100 for two HPWC installed.
Thanks for replying. After a manual upgrade, turned out my problem was a more pedestrian issue of a neighbor saturating the Wi-Fi 2.4 ghz channels near the charger. Upped antenna power on an access point and voila.
Peter_M
Member
If anyone is interested in setting up more than four Tesla Wall Connectors with Power Sharing, the latest firmware (21.36.6) now supports up to six WCs.
Details are at Gen 3 Wall Connector Power Sharing and the latest firmware is at Troubleshooting a Gen 3 Wall Connector.
A few tips for setting it up (for any number of WCs):
Details are at Gen 3 Wall Connector Power Sharing and the latest firmware is at Troubleshooting a Gen 3 Wall Connector.
A few tips for setting it up (for any number of WCs):
- Turn off cellular data on your phone before starting and leave it off until you're all done
- Turn off auto-join for the WC WiFi networks in your phone's WiFi settings, so that it won't join the wrong network. I also temporarily turned off auto-join for my home network so it wouldn't keep switching back to that
- Once you connect to the device on its internal WiFi network, go to http://192.168.92.1, not https. If you just enter 192.168.92.1, your browser may assume https and that won't work
- Update the firmware on all WCs before you configure Power Sharing
- For updating the firmware, go to http://192.168.92.1/service, not http://192.168.92.1/update as in Tesla's instructions
This is an old post, but just FYI, if I'm looking at that image right, the neutral and grounds are nutted together, which is no bueno. If that wiring goes back to a main panel rather than a subpanel it might not matter from an electrical point of view, but it's still definitely not to code.
Incidentally, I just finished helping my dad setup a two wall connector setup going to a subpanel. Sharing a 60A circuit, I noticed when both cars are plugged in, the max one will pull is 42A even if the other is done charging. Is this the expected behavior?
If you look closely, there's a second blue wire nut above the first with at least one green wire entering it.
Peter_M
Member
What did you set as the maximum total current? If they share a 60A circuit, it should be 48A. It takes about 10 minutes for a single unit to ramp up to the maximum current when the other one is not charging, and even when only one is charging, the current seems to drop and come back up every half hour or so.
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