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48A vs. 40A for home charging??

What amperage do you recommend for home charging an R1S?


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Zoidz

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Totally agree. I had my 240 volt nema outlet melt with just using the rivian portable charger. Thankfully nothing burned down.
This problem can be avoided by using an industrial quality (i.e. Hubbell 9450A) NEMA 14-50 outlet. It does cost $80 - $100+ depending on where you buy it. But this is absolutely a "you get what you pay for" situation. I would NEVER buy a cheap NEMA 14-50 on Amazon or other online places where the price is $10-$50. Absolutely not worth the savings.

If anyone out there is hiring an electrician to do an install, insist on Hubbell (any knowledgable electrician would likely use Hubbell anyhow) and make them give you the paperwork out of the package to prove it.
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CJdergroße

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Replaced my Tesla 48A Gen 3 Charger (which kept overheating), with my Rivian 48A, works perfectly. Love the look of it, has the same green pulse like our trucks do. Would highly recommend!
 

Dark-Fx

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.02 cents, I don't know why anyone would spend $80k+ on a vehicle and then "cheap out" by not installing electrical equipment that is safe and "to code". Some of these comments just seem eye-rollingly dumb to me.

Good luck charging at 48A on a 30A breaker, or whatever it is some of y'all are trying to do, LOL. 🤷🔥🔥🔥🔥🔥🔥
Technically the equipment is supposed to be designed to handle 125% of the rated current without melting down, but that's a technicality I'm not interested in testing long term.
 

electricRaptor

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Ima jump on the 48a train. Great seeing these 11+kw rates.

Rivian R1T R1S 48A vs. 40A for home charging?? IMG_9278
 

TxnBluDvl

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This problem can be avoided by using an industrial quality (i.e. Hubbell 9450A) NEMA 14-50 outlet. It does cost $80 - $100+ depending on where you buy it. But this is absolutely a "you get what you pay for" situation. I would NEVER buy a cheap NEMA 14-50 on Amazon or other online places where the price is $10-$50. Absolutely not worth the savings.

If anyone out there is hiring an electrician to do an install, insist on Hubbell (any knowledgable electrician would likely use Hubbell anyhow) and make them give you the paperwork out of the package to prove it.
Another often used industrial grade NEMA 14-50 outlet is the Bryant 9450FR. Bryant is owned by Hubbell. A 9450FR sells for around $49 and a Hubbell 9450A currently sells for $213 at Grainger.

For those who want to head down a deep rabbit hole on these outlets, this is a well regarded thread that goes into cheap vs industrial grade outlets. https://teslamotorsclub.com/tmc/threads/master-thread-definitive-14-50-nema-outlet-guide.140694/
 

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Zoidz

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Another often used industrial grade NEMA 14-50 outlet is the Bryant 9450FR. Bryant is owned by Hubbell. A 9450FR sells for around $49 and a Hubbell 9450A currently sells for $213 at Grainger.

For those who want to head down a deep rabbit hole on these outlets, this is a well regarded thread that goes into cheap vs industrial grade outlets. https://teslamotorsclub.com/tmc/threads/master-thread-definitive-14-50-nema-outlet-guide.140694/
I pay $89 for Hubbell 9450A through my company's electrical distributor. Maybe I should start selling them on eBay for $150, lol.
 

TxnBluDvl

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I pay $89 for Hubbell 9450A through my company's electrical distributor. Maybe I should start selling them on eBay for $150, lol.
Trade prices are for sure cheaper. If one has a hookup through their company, that’s the way to go.

Grainger isn’t cheap but they’re everywhere and open to the public, customer service is excellent and everything you buy from them is legit.
 

Green Mean Machine

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I'm building my house and I'm going with the 60A circuit since is better overall from the beginning. Currently I'm using my 30A from my dryer and it gives me about 10 to 14 miles per hour so it will take the night (I start charging at 9:30 that rates are cheaper) to go to 85% in about 8-9 hours depending on miles left (usually I charge it when I have 100 miles plus of minus a few.
 

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I do the missing 3rd option - 30-40 amp charging on a 60 amp circuit. My EVSE can charge at 48A if I need to, but rarely do I need to. Since I plan on keeping the R1S past the warranty, I charge at a lower rate to *theoretically* prolong the battery life. Based on my use patterns, I don't need to top off the battery in 4 hours, I'm fine with 6 or 7. No time of day cost reduction programs, my utility is still in the 1960s mentality.
at that low amperage, will it really prolong the life of the battery going 40 instead of 48? i know keeping the soc between 20-70% will definitely prolong the life but havent heard that about the lower amps.
 

SparkyR1t

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Summing it up whether you charge at 10 amps or 48 amps your battery does not care it’s all about the time it takes to charge at lower amperages

My rule of thumb has always been go with the highest current circuit your panel can safely handle and afford

And always go hardwired versus a plug in for any electrical equipment unless you need to move the equipment around frequently

have fun
 

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at that low amperage, will it really prolong the life of the battery going 40 instead of 48? i know keeping the soc between 20-70% will definitely prolong the life but havent heard that about the lower amps.
Yeah, any AC charging is low-enough power to be effectively the same to the battery pack. At that point, you’re just having efficiency losses by having a higher percent of the power go to “charging processes” instead of directly into the battery.

Sure, in a very small pack, especially one without active conditioning like a first-gen Nissan Leaf, 24A vs 32A vs 40A may make an appreciable impact on battery long-term health. But in the Rivian? It won’t matter. Even 80A (if Rivian supported it) likely wouldn’t make a significant difference.

That said - to answer the original question - does it matter if your truck recharges from 0% to 100% in 12 hours instead of 16 hours? If it matters, go for the bigger. If it doesn’t, don’t bother.

I have two 40A EVSEs load-shared across a single 60A (48A max combined) circuit. I charge two EVs on it. When both are plugged in, each only gets 24A until one is done charging, then the other gets up to the full 40A of an individual EVSE.

And I’m on “time of use” billing, where my EVSEs only allow power to flow between 10 PM and 6 AM (off-peak pricing times.)

I have never woken up and not had enough range in my Rivian. Even when I plugged in both vehicles near-empty the night before. Sure, in that specific case, my Rivian had only charged up to about 70% by the time off-peak ended, but that use-case is rare. Usually I don’t have both vehicles at near-empty when I plug in.
 
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Feetdry

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I'm building my house and I'm going with the 60A circuit since is better overall from the beginning. Currently I'm using my 30A from my dryer and it gives me about 10 to 14 miles per hour so it will take the night (I start charging at 9:30 that rates are cheaper) to go to 85% in about 8-9 hours depending on miles left (usually I charge it when I have 100 miles plus of minus a few.
'Saw Mean Green and I thought the company that I purchased my EV zero turn Rival from, was contacting me regarding my mower. Not the case. I'm pretty much all electric here and have pretty much everything powered with the solar panels. Plug my Mean Green rival into a 50-amp receptacle and my R1T is on a 60-amp circuit, hardwired, with the Rivian charger. It all works as advertised and it's great not to have anything ICE on 3-1/2 acres.
 

Zoidz

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at that low amperage, will it really prolong the life of the battery going 40 instead of 48? i know keeping the soc between 20-70% will definitely prolong the life but havent heard that about the lower amps.
As I said in my original post "theoretically" a lower charging rate could increase battery life. It's well know that excessive heat will damage the battery. It's well known that the higher the charge rate, the more heat is generated. For example, that's why higher power DC fast chargers have liquid cooled cables. It follows that to some unknown degree, lower charging rates could improve battery life by reducing heat, especially in warmer weather. So since I don't NEED to charge in 4 or 5 hours, I'll charge at a lower rate and maybe it helps the battery. If it makes no difference, I still am fully charged at 7 AM the next morning.
 

jemkewl

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Neither. Ran 6 awg copper THHN off a 60amp breaker to a 14-50 and use the Rivian portable charger at 32 amps. Have the ability to easily upgrade or hardwire, but haven't needed the extra miles per hour of charge. Do what meets your driving habits and spend as little or as much money as you want.
 

Green Mean Machine

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So I when with 50A with a NEMA-14-50 connected to a Juicebox. I get 48v, which gives me 20-25 miles per hour according to the Rivian app. However, from 25% to 85% it takes 10 to 12 hours. Is this normal? or is this slow?
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