Vampire drain - what's the latest battery % loss people are getting?

[HyperionMark]

Yep, shipping mode only turns off the sensor heaters. So if you live in a warmer climate you won't see those benefits. Sadly there seems to be 1-2 kWh's of loss other than the heaters.
I have verified via thermal camera that shipping mode does turn off those heaters.

Sponsored

 

[HaveBlue]

Maybe they are also lfp batteries that suffer in the cold.

 

[MountainBikeDude]

Umm.. Don't want to rile up the group but my battery drain over a 5ish hour period, not plugged in, with Gary's watchful eyes enabled, at around 7 degrees Celsius is....
+1% soc.

BMS error in your favor! ? Collect 1.35 KWh!

 

[nc10]

I tried to do a rigorous test of my R1T's energy losses in March. Set the trip counter on Mar 1. Tracked charging session summaries on the R1T display, data from my utility meter (dedicated to the EV charger), and data from the Rivian app. Drove 1070 miles in 30 days. Charged at home using a Rivian charger.

I used 618 kwhrs from the power company (the charger thinks i used 623 kwrs, < 1% difference)
-lost 53 kwhrs as my AC power was converted to DC for the truck, comparing the charging app data and the session summaries on the R1T display
-Used 458 kwhrs in actual driving, according to the R1T trip meter efficiency of 2.34 mi/kwhr
- Lost 107 an additional kwhrs, which I consider vampire losses. 3.56 kwhrs /day vampire losses.
- Based on power purchased from my utility, I got 1.73 miles range/kwhr purchased
I have some concerns about the Rivian Trip meter numbers. The trip meter reports a "total energy used" number, but I can't tell for sure what this is based on, does not match up with the session summaries, and is not used to calculate the efficiency. See screenshot below.

More detailed info below,

Summary
1070. 6 miles driven
623 khrs taken from my power company according to my Rivian charger
618 kwhrs taken from the power company according to my power company (< 1% difference). I will use the power company number below
565 Kwhrs reported in the session summaries on the R1T display

Actual electrical energy used driving: Efficiency reported by the R1T trip meter is 2.34 miles/kwhr, so I used 1070.6 mi/ (2.34 mile/kwhr) = 458 kwhrs actually driving

Other electricity usages
Charging losses in March 53 kwhrs (618-565=53 kwhrs, difference between kwhrs reported in the Rivian charging app and kwhrs reported in the charging session summaries on the R1T display) I assume these are losses that occur when my 220V AC power is converted to DC for the truck?

"vampire losses"
618 kwhrs - 458 kwhrs used driving - 53 kwr charging conversion losses = 107 kwhr = 3.56 kwhr / day over 30 days in March.

=====================================

- On March 1st, I reset the trip meter on my truck
- Data collected from mid morning Mar 1, 2023 through early March 31, 2023.
- I have a Rivian Level 2 charger in my garage.
- My utility company put in a separate dedicated meter for my EV charger (so I could get a special EV charging rate). So I know exactly how much power I am buying for EV charging.
- My garage is attached to my home, not heated, did not track temp in the garage, but temps have been moderate here and the house temp helps moderate the garage temps (South Carolina, near Charlotte).
- Drove 1070 miles.
- 12 charging sessions, average of 51.9 kwhr per session, based on the kwhr showed in the app charging history (AC kwhrs, before conversion to DC)
- I recorded the session summary reported on the R1T display after each charging sesssion. Kwhrs are always close to 90.8% of the value reported by the charger, but the ratio varies slightly (I assume losses converting from AC to DC power used by the truck).

The R1T trip display reports efficiency of 2.34 miles/kwhr
Dividing total energy reported by the R1T Trip display by miles = 2.12 miles/kwhr

Energy usage estimated by summing up session summaries
on the R1T display in the truck = 565 kwhr
Energy efficiency based on session summary totals 1.89 miles/hr
AC Energy usage based on power meter, 618 kwhr
Efficiency based on Utility meter usage 1.73 miles/kwhr
AC Energy usage reported by charger in the Rivian App, 623 kwhr
Efficiency based on Charger app usage 1.72 miles/kwhr

Power usage using R1T Trip display efficiency
(1070.6 miles)/ (2.34 miles/kwhr) = 457.5 kwhr

Estimated phantom losses based on on Rivian trip usage of 2.34 miles/kwhr and session summary total of 565 kwhrs reported used by the R1T

565- (1070.6/2.34) = 107 kwhrs phantom losses in 30 days (3.57 kwhr/day)

Charger conversion losses (going from AC to DC?)
623- 565 = 58 kwhrs.

 

[DTown3011]

I hope Rivian is reading this thread. Lots of good data!

 

[HyperionMark]

I tried to do a rigorous test of my R1T's energy losses in March. Set the trip counter on Mar 1. Tracked charging session summaries on the R1T display, data from my utility meter (dedicated to the EV charger), and data from the Rivian app. Drove 1070 miles in 30 days. Charged at home using a Rivian charger.

I used 618 kwhrs from the power company (the charger thinks i used 623 kwrs, < 1% difference)
-lost 53 kwhrs as my AC power was converted to DC for the truck, comparing the charging app data and the session summaries on the R1T display
-Used 458 kwhrs in actual driving, according to the R1T trip meter efficiency of 2.34 mi/kwhr
- Lost 107 an additional kwhrs, which I consider vampire losses. 3.56 kwhrs /day vampire losses.
- Based on power purchased from my utility, I got 1.73 miles range/kwhr purchased
I have some concerns about the Rivian Trip meter numbers. The trip meter reports a "total energy used" number, but I can't tell for sure what this is based on, does not match up with the session summaries, and is not used to calculate the efficiency. See screenshot below.

More detailed info below,

Summary
1070. 6 miles driven
623 khrs taken from my power company according to my Rivian charger
618 kwhrs taken from the power company according to my power company (< 1% difference). I will use the power company number below
565 Kwhrs reported in the session summaries on the R1T display

Actual electrical energy used driving: Efficiency reported by the R1T trip meter is 2.34 miles/kwhr, so I used 1070.6 mi/ (2.34 mile/kwhr) = 458 kwhrs actually driving

Other electricity usages
Charging losses in March 53 kwhrs (618-565=53 kwhrs, difference between kwhrs reported in the Rivian charging app and kwhrs reported in the charging session summaries on the R1T display) I assume these are losses that occur when my 220V AC power is converted to DC for the truck?

"vampire losses"
618 kwhrs - 458 kwhrs used driving - 53 kwr charging conversion losses = 107 kwhr = 3.56 kwhr / day over 30 days in March.

=====================================

- On March 1st, I reset the trip meter on my truck
- Data collected from mid morning Mar 1, 2023 through early March 31, 2023.
- I have a Rivian Level 2 charger in my garage.
- My utility company put in a separate dedicated meter for my EV charger (so I could get a special EV charging rate). So I know exactly how much power I am buying for EV charging.
- My garage is attached to my home, not heated, did not track temp in the garage, but temps have been moderate here and the house temp helps moderate the garage temps (South Carolina, near Charlotte).
- Drove 1070 miles.
- 12 charging sessions, average of 51.9 kwhr per session, based on the kwhr showed in the app charging history (AC kwhrs, before conversion to DC)
- I recorded the session summary reported on the R1T display after each charging sesssion. Kwhrs are always close to 90.8% of the value reported by the charger, but the ratio varies slightly (I assume losses converting from AC to DC power used by the truck).

The R1T trip display reports efficiency of 2.34 miles/kwhr
Dividing total energy reported by the R1T Trip display by miles = 2.12 miles/kwhr

Energy usage estimated by summing up session summaries
on the R1T display in the truck = 565 kwhr
Energy efficiency based on session summary totals 1.89 miles/hr
AC Energy usage based on power meter, 618 kwhr
Efficiency based on Utility meter usage 1.73 miles/kwhr
AC Energy usage reported by charger in the Rivian App, 623 kwhr
Efficiency based on Charger app usage 1.72 miles/kwhr

Power usage using R1T Trip display efficiency
(1070.6 miles)/ (2.34 miles/kwhr) = 457.5 kwhr

Estimated phantom losses based on on Rivian trip usage of 2.34 miles/kwhr and session summary total of 565 kwhrs reported used by the R1T

565- (1070.6/2.34) = 107 kwhrs phantom losses in 30 days (3.57 kwhr/day)

Charger conversion losses (going from AC to DC?)
623- 565 = 58 kwhrs.

Great data, thanks for posting!

3.56 kWh per day is definitely on the higher end of what people are seeing, but I also think some people are underestimating since they aren't doing this level of detail.

I assume you are parking outside or at least in an uninsulated garage?

 

[HyperionMark]

Now that I have the new software update I need to do some checking with my thermal camera. Updates to follow.

 

[Singletracker]

3.56 kWh per day lost! Ouch!!!! That’s like 7+ miles of range per day lost. That’s nuts! C’mon Rivian.

I can’t recall anybody reporting about any comments Rivian may have made on this subject. Why the crickets? Why do we not have some sort of an explanation?

 

[the_mace]

I've noticed that (perhaps since latest update but i've only had my truck a short time) that the car often sits empty and locked with the climate going and stereo playing. I find it like that after hours of leaving it alone. A stereo probably doesnt draw much power but if its keeping a larger CPU etc awake then it could be drawing more. Climate obviously would draw power too.

 

[HyperionMark]

Now that I have the new software update I need to do some checking with my thermal camera. Updates to follow.

First check was unplugged and untouched for a while (AKA should be asleep) but out of shipping mode. And....SUCCESS! Seems like this update might have squashed the bug of keeping the sensor heat on.

 

[alisdair1941]

First check was unplugged and untouched for a while (AKA should be asleep) but out of shipping mode. And....SUCCESS! Seems like this update might have squashed the bug of keeping the sensor heat on.

Pics or it didn't happen! ?

 

[alisdair1941]

I just got the new update installed. For posterity, running the standard 24-hour test after zeroing out the trip meter:

 

[HaveBlue]

First check was unplugged and untouched for a while (AKA should be asleep) but out of shipping mode. And....SUCCESS! Seems like this update might have squashed the bug of keeping the sensor heat on.

Nice! Is it cold where you are though?

Lots of good research from people. I wonder whether the "normal" 10% loss Rivian says is ok has to do with the AC to DC charging loss and the discrepancy with delivered and lost. It could be a misinterpretation by Rivian on the question.

 

[HyperionMark]

Nice! Is it cold where you are though?

Lots of good research from people. I wonder whether the "normal" 10% loss Rivian says is ok has to do with the AC to DC charging loss and the discrepancy with delivered and lost. It could be a misinterpretation by Rivian on the question.

Garage is around 35-38 and those sensors like to be upper 50s or higher.

 

[the_mace]

Latest update of 2023.10.1 seems to keep my truck awake all the time and is playing music while sitting there charging or not charging with no keys near it.

Anyone else seeing that?

Sponsored