03-06-2024, 09:36 PM | #1 |
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Geeking out on regen data
I discovered a new screen recently - when you go to the live vehicle mode and clock on trip data, I can see how much regen my motors have returned to the battery for each trip. It’s pretty impressive to me - here’s a screen shot of the data from my commute home.
It’s a Bay Area highway slog with lots of stop/go traffic and a net uphill. The stats are: Approx elevation gain ~1,000ft Distance 27.4mi Energy used 8.6 kWh Efficiency 3.2 mi/kWh From the screen below, I was able to return 3.5kWh through coasting/downhill in B mode, so effectively 3.5 x 3.2 = 11.2miles of that journey was “free”. It also struck me that 3.5kWh of regen is pretty impressive - equivalent to the power require to run a hair dryer or a space heater for 3.5hrs. If I conservatively assume that 15% of the time I was harvesting regen - that would mean that the regen power was 3.5 kWh / 0.1725h (15% of the journey time) = 20.3kW - which is 2x higher than an L2 charger. Neat. I’d be interested if anyone knows what the max regenerative power actually is from the motors on an i5 - my guess is that the peak is much higher than that number. Given that my morning commute is a net elevation loss, the numbers look even better then. Last edited by RichardInCA; 03-06-2024 at 11:37 PM.. |
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03-07-2024, 01:10 AM | #2 |
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That’s cool, but isn’t this the same data as in the MyBMW app?
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03-07-2024, 02:42 AM | #3 | |
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I'd be curious to see which one is best for that trip. I remember reading somewhere, many weeks ago in a forum that depending on where/how you drive, D mode with adaptive regen will produce more regen than B mode. I think the forum poster said to use D mode with adaptive regen for the best efficiency when highway driving at speed, but use B mode for city driving, or lots of stop-and-go driving. I wonder if that is correct, or just another opinion on a forum. Thanks for sharing all this data, I find it really interesting too.
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03-07-2024, 08:39 AM | #4 |
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03-07-2024, 08:40 AM | #5 | |
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03-07-2024, 11:03 AM | #6 |
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Is this Sunol grade? or Altamont? My daily commute used to be on 680 from east bay to san jose.
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03-07-2024, 11:31 AM | #7 |
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This is fascinating, impressive, super cool and just really great. Thanks for taking the time to share with us.
I have now had several i3S, iX, i4 and now this i5 and BMW battery efficiency and range is beyond and above amazing!!!! |
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03-07-2024, 12:12 PM | #8 |
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03-07-2024, 04:47 PM | #9 |
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Unfortunately I forgot to take a pic of that regen on my reverse commute this morning, I think it was actually somewhat similar ~3.3kWh? But the total energy consumption is much lower (reflecting the “downhill” nature of the reverse direction). I’ll try to do a “drive in D” comparison next.
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03-08-2024, 12:36 PM | #10 |
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03-08-2024, 05:59 PM | #11 |
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Thanks for highlighting this. I found it and tried it today!
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03-08-2024, 06:16 PM | #12 |
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The car infographic is fun to look at too!
It animated just about every light and movement except the wipers … |
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03-08-2024, 09:07 PM | #13 |
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04-02-2024, 08:39 AM | #14 |
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Updating this thread with some more data. I have been tracking my journey into the office as well - to be honest it’s slightly less variable than the journey home due to traffic. I compared B mode, with D (adaptive) mode. I didn’t bother trying to turn down the regen on D, perhaps I will for another round of comparisons.
Elevation change ~1,000ft net loss Distance ~28miles Efficiency: 4.0-4.5 mi/kWh (B) 4.2-4.3 mi/kWh (D adaptive) Regen: 3.0-3.7 kWh (B) 2.5 - 2.9 kWh (D adaptive) Consumption: 6.3-6.7 kWh (B) 6.5.-7 kWh (D adaptive) It took me a bit of time to adapt to D adaptive….sometimes it wants to coast other times the regen kicks in to slow you down for a car that moves in front or if you coast so enthusiastically downhill that it decides you’re about to go substantially over the speed limit. I started to adapt to that, but overall I think B is still better - I like the modulation I can get of my speed by just lifting off a little to adapt to traffic. |
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04-02-2024, 12:05 PM | #15 |
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That's really interesting and thanks for taking the time to do that. I want to do something similar with my trip to the tennis courts which are about 11 miles away from home. I just looked at the trip there and then back yesterday in D adaptive mode. Going to the courts is an overall downhill trip so I got 4.1 mi/kWh with an average speed of 18.6 mph (no freeway). However, on the way home, it's net uphill so I got 3 mi/kWh with an average speed of 36.2 mph.
I'm going to try a couple of different routes to see if the numbers have any significant variance. Then, after that I'll probably try using D mode to compare.
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04-02-2024, 02:41 PM | #16 |
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It is cool. My downhill trips are 7.6 and will try D vs B as well.
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04-02-2024, 06:19 PM | #17 |
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Yeah for the avoidance of doubt the trips are “net” downhill or “net” uphill - there are climbs and descents either way.
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04-02-2024, 06:44 PM | #18 |
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Now MyBMW app isn’t showing all my trips. My first test is a no go.
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04-16-2024, 09:55 AM | #19 |
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is there a way to change brake regen from 2 to 1 line, i know B puts it into 3 , its too jerky for passengers at 2 bars ?
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04-16-2024, 10:16 AM | #20 |
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You can adjust the D mode to have low/med/high regen - that might be the best bet. I find that I’ve completely adjusted to B so modulating the throttle pedal blends in more or less regen. I only lift my foot off if I need to really slow down.
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04-16-2024, 10:58 AM | #21 | |
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thank you |
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04-16-2024, 11:13 AM | #22 |
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