Home Wall Charger

[TheKoz]

Newer member to the forum and just recently purchased a R1T and Rivian home charger. Just an FYI that you can get a Rivian home charger on eBay for much less - used or new. Another option to consider.

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[Ndaddy2k]

Also new to the forum. Took an R2 test drive today and I asked about being able to charge it on my Tesla Wall Connector (Gen3 installed in 7/21). I was told that it may not work with an R2 given the age of the Wall Connector. Has anyone experienced problems with an older Gen3 charger and an R2? I apologize if I missed it reading through the posts.

 

[emroch]

My main factor is that I have solar panels and powerwall batteries on my house. My local utility co-op does not offer cheaper time of use rates, and does not offer net pricing, so I want to charge in the middle of the day, and use lower amps that use less power than what I am producing at the time, especially if I am not in a hurry to get to 80%.
R2 will not let us reduce charging speed to 28 amps if my home charger is on a 60 amp breaker. My old Tesla gen 2 charger did not have that capability, because the Model Y allowed me to change.
my Lyriq, like Rivian, does not give me that option, so I installed an Emporia. Through the app, I can set at 28 amps, but also increase back up to 48 if I need a quicker charge.

You can set a maximum charging current in the R2 itself, either for all charging sessions or the current one. It's not tied to a specific charger though, so you'd have to remember to adjust it up/down for each charger that you use.

Sounds like you've already installed an EVSE that does what you need, but there are also some that integrate with solar/battery systems (or have CT smart meters) and could dynamically limit the charge based on solar production/home usage.

 

[kshtxag]

You can set a maximum charging current in the R2 itself, either for all charging sessions or the current one. It's not tied to a specific charger though, so you'd have to remember to adjust it up/down for each charger that you use.

Sounds like you've already installed an EVSE that does what you need, but there are also some that integrate with solar/battery systems (or have CT smart meters) and could dynamically limit the charge based on solar production/home usage.

Thanks. I stand corrected...

 

[emroch]

Rivian Assistant told me not possible to change charging amps

This screenshot is for an R1, but the R2's energy page looks similar. The "48 Amps" button at the bottom of the left panel is what lets you limit the charging current.
https://stories.rivian.com/ev-home-charging-rivian

 

[Zathras]

Also new to the forum. Took an R2 test drive today and I asked about being able to charge it on my Tesla Wall Connector (Gen3 installed in 7/21). I was told that it may not work with an R2 given the age of the Wall Connector. Has anyone experienced problems with an older Gen3 charger and an R2? I apologize if I missed it reading through the posts.

The Gen 3 wall charger will work as long as you have the setting for charging all cars, rather than just Teslas or Teslas based on their VIN number.

If you're getting a Launch Edition and you live in specific states, you're able to get RIvina's mobile charger (NACS) for free. It will charge your Rivian at 32 amps (with the right electrical connections in your home) no problem from what I'm hearing.

 

[Zathras]

Rivian Assistant told me not possible to change charging amps

The Assistant is wrong. I just watched a demo and it clearly showed the user setting the amperage to 32 amps.

If you schedule the charging session in your vehicle, it lets you set the specific amperage you want. So it will always charge at that amperage as long as the schedule initiates the charge. If you are not using a specific scheduled charging session you need to set the amperage before you plug it in.

 

[kshtxag]

The Assistant is wrong. I just watched a demo and it clearly showed the user setting the amperage to 32 amps.

If you schedule the charging session in your vehicle, it lets you set the specific amperage you want. So it will always charge at that amperage as long as the schedule initiates the charge. If you are not using a specific scheduled charging session you need to set the amperage before you plug it in.

OK - apologies. I stand corrected. I had asked Assistant before and was told no.
After reading posts here, I asked Assistant again and got this answer:

Yes, you can make that change directly in your R2. The vehicle’s Energy App or infotainment display lets you manually set the charging amperage, so you can lower it to 28 amps even if your Level 2 charger is installed on a 60 amp breaker. This gives you control over your charging rate, helping you match your home’s electrical setup or manage heat.​

I should delete my earlier post to avoid confusion...

 

[Tony S]

Just a point of clarification.
My Polestar is set to 48 amps, and the Grizzl-e charger (EVSE) is set to 40 amps and all is good. When I get the R2, do I have to match its amps to 40?

 

[emroch]

Just a point of clarification.
My Polestar is set to 48 amps, and the Grizzl-e charger (EVSE) is set to 40 amps and all is good. When I get the R2, do I have to match its amps to 40?

Nope, if the EVSE can only provide 40A the car will only draw 40A. In that case it will be the EVSE limiting the maximum current rather than the car, but it will all work fine. Same thing happens if you use a mobile charger that can only provide 15-20A.

 

[Tony S]

Nope, if the EVSE can only provide 40A the car will only draw 40A. In that case it will be the EVSE limiting the maximum current rather than the car, but it will all work fine. Same thing happens if you use a mobile charger that can only provide 15-20A.

Yep, that makes sense; part of the initial handshake between EVSE and car on every charging session.

 

[terracode]

I went with a friend doing an R2 test drive yesterday. Rivian customer service person said that Rivian will provide a free portable charge connector to buyers in CA as part of the California Clean Air program. She said that the buyer has to add the charger to the order when reserving. She wasn't sure how long this incentive will last.

 

[Rivian Owner]

Thanks. I stand corrected...

With a charger such as the Emporia you can throttle the charge rate from the supply side regardless of what the vehicle's max rate is set to. If you pair their charger with their Vue, you can have the charger throttle the charge rate based on the loads in your panel so you don't exceed the rating of the panel.

 

[SwampNut]

With a charger such as the Emporia

With EVERY wall mount charger, that's part of the spec/requirement. And also with many or most portables, but not required.

The J1772 standard is an ultra-simple PWM signal sent down one of the small pins. The EVSE has a certain cycle for "here's what I can do" and the vehicle sends "here's what I can accept" down the other. The third is ground. The vehicle then takes whatever is the best option. The EVSE is a rather dumb and simple device and cannot "throttle" the charge in the sense of actually interrupting the flow. It can only change the signal and tell the vehicle what to do. When you set the EVSE to limit the current, it just sends a different level of "here's what I can do."

One of my portables has a button to set that, like many others. The Rivian and Tesla portables use a pigtail to set the current.

 

[Rivian Owner]

With EVERY wall mount charger, that's part of the spec/requirement. And also with many or most portables, but not required.

The J1772 standard is an ultra-simple PWM signal sent down one of the small pins. The EVSE has a certain cycle for "here's what I can do" and the vehicle sends "here's what I can accept" down the other. The third is ground. The vehicle then takes whatever is the best option. The EVSE is a rather dumb and simple device and cannot "throttle" the charge in the sense of actually interrupting the flow. It can only change the signal and tell the vehicle what to do. When you set the EVSE to limit the current, it just sends a different level of "here's what I can do."

I guess you haven't looked at the Emporia chargers. They aren't a "dumb" device and they can throttle the rate of charge. Go have a look at their products.

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