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Wall charger installation at home - suggestions and recommendations? ⚡️⚡️

RivianXpress

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Can anyone comment the charge speed in the truck after installing the Rivian charger?

I installed my charger yesterday with a new 60A breaker, 6/3 Romex (@$7.49 per foot!) and after plugging in the truck I see it says 48A but the charging speed ramped up to 18 and then was fluctuating between 16 and 18 never going above 19 miles added per hour. I only left it plugged in for a few min and will try again today.

Thanks in advance.
 

lefkonj

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hired an electrician, cost about 2k and waited 12 weeks for them to do the work. They are very busy these days with home projects and took time to get to us.

I went with the juice box.
 

ajdelange

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I installed my charger yesterday with a new 60A breaker, 6/3 Romex (@$7.49 per foot!)
I'll start by pointing out again for anyone who is contemplating doing this but hasn't done it yet that you cannot use No. 6 Romex in a 60 A circuit. It's ampacity is 55 A. Several here have decided to do it anyway. In so doing they are accepting some risk. Your house won't burst into flames because you did this but if you have a fire for whatever other reason your insurance company may, upon discovering the code violation and that the work was not permitted or inspected, refuse coverage,

and after plugging in the truck I see it says 48A but the charging speed ramped up to 18 and then was fluctuating between 16 and 18 never going above 19 miles added per hour. I only left it plugged in for a few min and will try again today.
It's been pointed out by others that miles added per hour isn't a very good proxy for battery chzarging rate. That said if your consumption be 500 Wh/mi and you charger have 90% efficiency you should pick up 0.9*240*48/500 = 20.74 mi per hour at 240V. If the voltage be 220V you would expect 0.9*220*48/500 = 19.008. I'm not suggesting that those are your actual voltages or consumption but the point is that a 5% change in line voltage will lead to a 5% change in power delivered to the battery and a 5% change in estimated range.

Another explanation may be that the displayed rate is quantized to 1 mph. If the calculated range changes from 18.4 to 18.6 the display will change from 18 to 19.

Nothing to worry about (other than the code violation).
 
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Gshenderson

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Can anyone comment the charge speed in the truck after installing the Rivian charger?
I’m getting about 22mph with a very similar (code violating! ?) setup to yours.
 

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chrismc

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FWIW, the outer metal sheath of the copper 6/2 MC (metal-flex-encased THHN) I used on the 60A circuit for my Rivian Wall Charger gets REALLY warm to the touch when I’m charging full-tilt (and it is in the open garage fastened to the wall, not even in-wall). There is ZERO chance I’d choose to gamble with 6-gauge NM-B/Romex for this task and potentially endanger my family and home.

Also, someone asked for a good source to buy the appropriate wire and I had a good experience with these guys. I needed 49’, so the 50’ length was perfect. https://www.wireandcableyourway.com...rmored-metal-clad-cable-250ft-or-1000ft-spool
 
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TheIglu

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Which connectors did you use on either end of your MC?

I’m running 6/3 MC and OD is reported to be .89”.
 

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chrismc

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Which connectors did you use on either end of your MC?

I’m running 6/3 MC and OD is reported to be .89”.
I found some nifty ones at Home Depot that have the anti-short bushing built-in. They fit in standard 3/4 knockouts with threads and locknut like any other connector. If I grabbed any extra, I’ll snap a pic of one.
 

psklenar

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Wow, you ordered the truck February of this year???
<blush> I'm sorry. I can't deny it, but I've tried to not point that out. I'm not going to turn it down, but I will feel guilty (for a while at least) as I drive it knowing how many people have been waiting for literally years. :(

The only thing I can think of is that I went with the basic Adventure config with an interior color that they are actually building. I've seen some folks wondering if they might have delivered enough of the 20" wheels that they are temporarily constrained and hence they are concentrating on the "stock" 21" wheels? If so, that would certainly have helped.

I honestly don't know how this happened so quickly. I've bought several lottery tickets over the past couple weeks (since the Guide introduction email) and haven't won anything there ... this may have used up all of my luck.

pat----
 
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ajdelange

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FWIW, the outer metal sheath of the copper 6/2 MC (metal-flex-encased THHN) I used on the 60A circuit for my Rivian Wall Charger gets REALLY warm to the touch when I’m charging full-tilt (and it is in the open garage fastened to the wall, not even in-wall). There is ZERO chance I’d choose to gamble with 6-gauge NM-B/Romex for this task and potentially endanger my family and home.
Since having had my nose in the NEC recently I'll comment that for NM-B the conductors must have insulation rated 90 °C (and so THHN is a candidate) whereas for MC they can be anything in Table 310.4(A) with no temperature requirement unless the size is 16 or smaller. Thus you must know what type of conductor is in the cable in order to determine the ampacity. Southwire says that its MC contains THHN wire which, as it is 90° rated, can carry up to 65A (No. 6 - limited by the 75° termination of the breaker) and is thus OK. Southwire's NB-B, conversely, is specified as having 90° insulation covered with a nylon sheath which sounds like THHN but they don't call it that. But NEC says that whatever the actual conductors are you must use the 60° rating which, for No. 6, is 55A. Though the actual conductors may be the same in both cases use of NM-B is a code violation whereas MC is not.
 

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I don’t like the white hot connection. And I’m speaking as someone that was screwing around in an old house and almost fried my butt cuz someone did something similar and I had no idea. Edit: just saw how short your white hot connection is, I guess if someone zaps them self then it’s their own fault.
It's definitely triggering to look at... In this install it's probably not huge issue due to how short the run is as it's all right there. Breakers should be off before anyone touches it and all that... But really, why connect the wrong color? And why use steel flex and not secure it?

And code still applies for DIY work... Working on your own house doesn't give you a free pass to ignore building codes, as it just becomes a bigger problem for the next guy. I'm renovating an old house right now and it's got layer upon layer of code violation and questionable DIY decision after another. I'm having the electrical re-done throughout the home because that is going to be easier than trying to sort out several owners worth of add-on stupidity. That and some of the original wiring still in operation is old webbing-wrapped from the '50s -- that's got to go. Putting in an EVSE as I do the upgrades.
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