mikehmb
Well-Known Member
- First Name
- Mike
- Joined
- Jan 12, 2022
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- 154
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- Location
- SF Bay Area
- Vehicles
- My name is Mike, and I have a (car) problem
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- #1
Just got back from a road trip from the Bay Area up to Ashland, OR for some mountain biking, which was awesome.
TL;DR - efficiency on the new R1S Gen2 with 22" brights was not great, though I did have a bike rack and 2 MTBs back there. And battery preconditioning doesn't seem to work. Also, the battery seems to have heated to the point of error while on DCFC. If you've had any weirdness with the cooling circuit, preconditioning, or battery temps on a Gen 2, I'd like to hear about it.
Note: vehicle charges fine to 100% on L2. Also, app & truck set to 100% so this problem did not exist between keyboard and chair. And yes, I had to repeat this about 9 times to the Rivian person who took the service ticket.
Ok, not quite sure where to start, so in order of discovered events:
1) Thursday afternoon, at the Shasta RAN, DCFC after 300 miles on the road. Wanted to bring the charge up to 100% (or near it). At around 85%, got "vehicle error, unplug and try again." Charge wasn't needed so I just left. Battery was at 122 degrees F which seemed high.
2) Sunday returning, planned to hit same RAN (the restaurant at the hotel there is actually pretty good for a roadside stop). Got there with around 35%, planned to let it ramp as high as we could get it so we could make it as far as possible home. Truck tripped the same error around 85%.
3) This time, tried again. Took about 2kWh, then stopped. One more time - about 1.5 more kWh. So got up to about 88% before setting off.
4) On the road, the battery was very hot - stayed up around 115 degrees, until it suddenly dropped to 74, then back up to 90, then back to the 70s. So clearly the cooling was working - ish.
5) Now comes the fun. Same speeds as on the way up, no headwinds - 30% lower efficiency, under 2 mi/kWh. Means I'm not getting home without another charge.
6) Throw it again on a DCFC, this time a gen4 Supercharger. Worked fine, and we left with 50% and 110 miles to go - should be plenty ... ha.
7) Battery is again at 124 degrees after DCFC session. This time, it doesn't go down, so I do a manual battery precondition -limited efficacy after 20 miles, decrease of maybe 5 degrees. Turned it off, 20 more miles, 5 more degrees.
Made it home with 6% to spare, which is way closer than I would have expected, especially with the slow speeds in the east bay and over the bridge.
Anyway, I'm a big proponent of "let the truck do its job" but clearly something is borked, and I suspect it's in the cooling circuit, so off it goes in August to the SC to diagnose.
TL;DR - efficiency on the new R1S Gen2 with 22" brights was not great, though I did have a bike rack and 2 MTBs back there. And battery preconditioning doesn't seem to work. Also, the battery seems to have heated to the point of error while on DCFC. If you've had any weirdness with the cooling circuit, preconditioning, or battery temps on a Gen 2, I'd like to hear about it.
Note: vehicle charges fine to 100% on L2. Also, app & truck set to 100% so this problem did not exist between keyboard and chair. And yes, I had to repeat this about 9 times to the Rivian person who took the service ticket.
Ok, not quite sure where to start, so in order of discovered events:
1) Thursday afternoon, at the Shasta RAN, DCFC after 300 miles on the road. Wanted to bring the charge up to 100% (or near it). At around 85%, got "vehicle error, unplug and try again." Charge wasn't needed so I just left. Battery was at 122 degrees F which seemed high.
2) Sunday returning, planned to hit same RAN (the restaurant at the hotel there is actually pretty good for a roadside stop). Got there with around 35%, planned to let it ramp as high as we could get it so we could make it as far as possible home. Truck tripped the same error around 85%.
3) This time, tried again. Took about 2kWh, then stopped. One more time - about 1.5 more kWh. So got up to about 88% before setting off.
4) On the road, the battery was very hot - stayed up around 115 degrees, until it suddenly dropped to 74, then back up to 90, then back to the 70s. So clearly the cooling was working - ish.
5) Now comes the fun. Same speeds as on the way up, no headwinds - 30% lower efficiency, under 2 mi/kWh. Means I'm not getting home without another charge.
6) Throw it again on a DCFC, this time a gen4 Supercharger. Worked fine, and we left with 50% and 110 miles to go - should be plenty ... ha.
7) Battery is again at 124 degrees after DCFC session. This time, it doesn't go down, so I do a manual battery precondition -limited efficacy after 20 miles, decrease of maybe 5 degrees. Turned it off, 20 more miles, 5 more degrees.
Made it home with 6% to spare, which is way closer than I would have expected, especially with the slow speeds in the east bay and over the bridge.
Anyway, I'm a big proponent of "let the truck do its job" but clearly something is borked, and I suspect it's in the cooling circuit, so off it goes in August to the SC to diagnose.
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