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windblowlc

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Rivian Gen 2 owners, we need to monitor level 2 charging behavior closely. If this happens on a regular basis, We need an explanation from Rivian as to the reasons. Not acceptable in my book.
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late to the post, this this info was wrong.
Maybe… Mine was also doing this on the day I picked it up (charging dropped right off after 80%) - and then stopped following a hard reset, and now charges just like our gen1’s do/did. Phew!
 

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windblowlc

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Maybe… Mine was also doing this on the day I picked it up (charging dropped right off after 80%) - and then stopped following a hard reset, and now charges just like our gen1’s do/did. Phew!
Good to hear! I will try to replicate what I have experienced the first time. If it continues to do it, I will do a hard reset like you did to see if the issue resolved.
 

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@SeaGeo ,

My R1T is my only EV in the house! II have never experienced this situation in nearly three years of Rivian Gen 1 ownership. My charger is 60 amp hardwired. Gen 1 R1T had always been charged at 11.5 kw at all times.
I have both generations. Though at 40 amps. I haven't experienced this.
Rivian Gen 2 owners, we need to monitor level 2 charging behavior closely. If this happens on a regular basis, We need an explanation from Rivian as to the reasons. Not acceptable in my book.
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I wonder if your pickup instance was from this:

https://riviantrackr.com/2024-39/
1734389906886-oy.png
Oh - that’s a great catch! I’m about to be out of town for 10 days, while the truck will sit off the charger - so will get to see what phantom drain is like and will report back either way on what the charge rate looks like when we get back. Thanks @SeaGeo
 
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Just checked my Juicebox app and after I hit 80% tonight. Apparently I just pull 9kw throughout... Im just plugged into the wall and not hard wired. That was for both my gen 1 and gen 2.
 

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Oh - that’s a great catch! I’m about to be out of town for 10 days, while the truck will sit off the charger - so will get to see what phantom drain is like and will report back either way on what the charge rate looks like when we get back. Thanks @SeaGeo
Unfortunately, the slow charging issue has returned. My plan was to top off the vehicle before heading to the airport—roughly 20% usage getting there—then leave it parked for about 10 days. With a Gen2 battery, I’m still unsure how much vampire drain to expect, but I wanted enough charge to comfortably get back home (another ~25% as the car(s) will be real cold by then) afterward.

To put this into perspective with actual numbers:

  • Gen1 (Large) Battery: Approximately 131 kWhtotal capacity.
    • Going from 85% to 100% means adding about 15% of 131 kWh, which is roughly 19.65 kWh.
    • Our Gen1's take about 1 hour 45 minutes to add that ~19.65 kWh, the effective charge rate was around 11.2 kW.
  • Gen2 (Max) Battery: Approximately 141 kWhtotal capacity.
    • Going from 85% to 100% is about 15% of 141 kWh, or roughly 21.15 kWh.
    • At a similar charge rate (around 11.2 kW), adding 21.15 kWh should take about 1 hour 53 minutes.
    • However, the actual reported time for the Gen2 is showing around 5:34 to 7 hours remaining for the same 15% increase per the app. That’s significantly slower than what the raw capacity difference would suggest.
When I spoke with Rivian support, they indicated this slower rate is expected for L2 charging because of the larger battery capacity. However, the data above suggests the rate is slower than just the capacity difference would warrant.

Maybe this should be discussed in a separate thread, but I'm now concerned that for longer excursions and overnight charging the gen2 max pack is a step back from the gen1 large.

Edit: adding some screenshots from the Rivian app this morning whist both our R1’s were charging.

Rivian R1T R1S Gen 1 Quad to Gen 2 Tri R1T Upgrade IMG_3706


Rivian R1T R1S Gen 1 Quad to Gen 2 Tri R1T Upgrade IMG_3705
 
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mkhuffman

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Unfortunately, the slow charging issue has returned. My plan was to top off the vehicle before heading to the airport—roughly 20% usage getting there—then leave it parked for about 10 days. With a Gen2 battery, I’m still unsure how much vampire drain to expect, but I wanted enough charge to comfortably get back home (another ~25% as the car(s) will be real cold by then) afterward.

To put this into perspective with actual numbers:

  • Gen1 (Large) Battery: Approximately 131 kWhtotal capacity.
    • Going from 85% to 100% means adding about 15% of 131 kWh, which is roughly 19.65 kWh.
    • Our Gen1's take about 1 hour 45 minutes to add that ~19.65 kWh, the effective charge rate was around 11.2 kW.
  • Gen2 (Max) Battery: Approximately 141 kWhtotal capacity.
    • Going from 85% to 100% is about 15% of 141 kWh, or roughly 21.15 kWh.
    • At a similar charge rate (around 11.2 kW), adding 21.15 kWh should take about 1 hour 53 minutes.
    • However, the actual reported time for the Gen2 is showing around 5:34 to 7 hours remaining for the same 15% increase per the app. That’s significantly slower than what the raw capacity difference would suggest.
When I spoke with Rivian support, they indicated this slower rate is expected for L2 charging because of the larger battery capacity. However, the data above suggests the rate is slower than just the capacity difference would warrant.

Maybe this should be discussed in a separate thread, but I'm now concerned that for longer excursions and overnight charging the gen2 max pack is a step back from the gen1 large.

Edit: adding some screenshots from the Rivian app this morning whist both our R1’s were charging.

IMG_3706.jpg


IMG_3705.jpg
This is probably worth a new thread. Seems like a significant issue to me.

I wonder if the reason is due to usable capacity versus total capacity. Maybe there's not much of a buffer at the top of the pack, so they have to slow the charge to avoid damage.
 

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I have not noticed much difference in level 2 charge times with my trimax.
 

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portdirect

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I have not noticed much difference in level 2 charge times with my trimax.
Did another hard reset (the “disco pose” one) , and back to 11.3kw charging at 96% - did it just to see before leaving house, so was only charging for 2 mins at this rate. Will look into this more when I get back and create a new thread (Unless someone else does).
 
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SeaGeo

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Just checked my Juicebox app and after I hit 80% tonight. Apparently I just pull 9kw throughout... Im just plugged into the wall and not hard wired. That was for both my gen 1 and gen 2.
So above 80% you were pulling 9kw? Was this through to 100%?

Unfortunately, the slow charging issue has returned. My plan was to top off the vehicle before heading to the airport—roughly 20% usage getting there—then leave it parked for about 10 days. With a Gen2 battery, I’m still unsure how much vampire drain to expect, but I wanted enough charge to comfortably get back home (another ~25% as the car(s) will be real cold by then) afterward.

To put this into perspective with actual numbers:

  • Gen1 (Large) Battery: Approximately 131 kWhtotal capacity.
    • Going from 85% to 100% means adding about 15% of 131 kWh, which is roughly 19.65 kWh.
    • Our Gen1's take about 1 hour 45 minutes to add that ~19.65 kWh, the effective charge rate was around 11.2 kW.
  • Gen2 (Max) Battery: Approximately 141 kWhtotal capacity.
    • Going from 85% to 100% is about 15% of 141 kWh, or roughly 21.15 kWh.
    • At a similar charge rate (around 11.2 kW), adding 21.15 kWh should take about 1 hour 53 minutes.
    • However, the actual reported time for the Gen2 is showing around 5:34 to 7 hours remaining for the same 15% increase per the app. That’s significantly slower than what the raw capacity difference would suggest.
When I spoke with Rivian support, they indicated this slower rate is expected for L2 charging because of the larger battery capacity. However, the data above suggests the rate is slower than just the capacity difference would warrant.

Maybe this should be discussed in a separate thread, but I'm now concerned that for longer excursions and overnight charging the gen2 max pack is a step back from the gen1 large.

Edit: adding some screenshots from the Rivian app this morning whist both our R1’s were charging.

IMG_3706.jpg


IMG_3705.jpg
I went back and looked at the couple of times I've fully charged our Gen2 max pack in my chargepoint history. As far as I can tell, my vehicle pulled the full 9kw till maybe 20 minutes before finishing charging.

Be careful back calculating on assumed capacity. Your Gen1 probably has some degradation, and the BMS in my Gen2 thinks it has about 143kwh of capacity instead of 141. You also need to consider the roughly 10% energy loss during AC charging. Keeping an eye on the actual charging rate in the app at the time of charging is probably best, unless you have another way to log charging rates (like home assistant).
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