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In Dec 2020 I joined the Recurrent Battery Health project. The goal is to develop a data base for car-specific battery health that EV Reseller can use to predict the health of the battery in a used EV. This month is the first time the report offered predictions for my 2019 E Tron Quattro SUV regarding what range my car would get it different ambient temps; 32F, 72F, 100F:
Basically I lose 10% of my miles if the ambient is 32F, as opposed to 72F; I lose 2.5%. if ambient is 100F, as opposed to 72F.
Not that different, though. Roughly 8 to 10% loss going to 32F; 2.5 to 3% going to 100F. They must have more datapoints from you...the uncertainty my numbers, especially at 32F, is notably larger than yours. The might converge next month!
In Dec 2020 I joined the Recurrent Battery Health project. The goal is to develop a data base for car-specific battery health that EV Reseller can use to predict the health of the battery in a used EV. This month is the first time the report offered predictions for my 2019 E Tron Quattro SUV regarding what range my car would get it different ambient temps; 32F, 72F, 100F:
Basically I lose 10% of my miles if the ambient is 32F, as opposed to 72F; I lose 2.5%. if ambient is 100F, as opposed to 72F.
From my experience at 20 deg c. 100% charge providing 324 km, at 25 deg c. 100% charge providing up to 350 km and at 10 deg c, it is only 180 km, as mentioned, AUDI battery highly sensitive to ambient temperature.
Have a look at previous posts on this subject. Some actual measurements as well as data from the German Audi website (~10% reduction at 32F from 72F - just what you are showing).
Is this GOM sensitivity or actual driven miles sensitivity. Where I live wind is big factor, I always check the wind directions for long drives.
Big drop of 4% ~ 10 miles from 60f - 50f. Last year I got my peak ranges @ 80f-82f, north of 240 miles.
You can check the RecurrentAuto.com site for more info. For participating vehicles they have access to real time Charging Status, EV Battery level, Odometer value, GOM estimate. As the posting states, the algorithm they are developing accounts for typical driving settings and cabin conditions based on geographic location and weather at the time. Right now there are over 2600 EV's in the study, but the E Tron numbers are pretty small. The goal here is to develop data that strictly reflects the sensitivity of the battery to ambient temp, nothing more, nothing less. It tries to average out other effects of driving conditions. Of course, if you are having bad weather, your numbers will be worse.
Have a look at previous posts on this subject. Some actual measurements as well as data from the German Audi website (~10% reduction at 32F from 72F - just what you are showing).
From my experience at 20 deg c. 100% charge providing 324 km, at 25 deg c. 100% charge providing up to 350 km and at 10 deg c, it is only 180 km, as mentioned, AUDI battery highly sensitive to ambient temperature.
In going from 25C to 10C you would also have greatly increased power being drawn to maintain cabin conditions, etc. Also you would suffer enhanced losses from the initial period when the cabin and battery would have to be warmed from a Cold Start. Perhaps that could explain some of the difference you see at 10C. The goal of the RecurrentAuto data is to average out those effects so it provides a number that looks strictly at the effect of ambient temperature. I must say, where I live I have been doing a lot of driving around 10C (50F) and I do not see anything near the loss you are observing after accounting for the initial warmup period. My casual observation is much more consistent with the RecurrentAuto report. Again, this data is not intended to show what kind of miles you will get out of the car on a drive; rather, it is intended to only give you an estimate of what % of any change you observe that you can attribute purely to the change in ambient temperature. Yes, as ambient temperature drops, other factors will also increase the demands on the battery.
04-01-2021, 05:12 PM
E Tron Battery sensitivity to ambient temperature
