I've done the battery re-initialization in my 2015 BEV recently, so the stats are going to be skewed for some time. Hence sharing my previous logged data for over one year of use and 29K km driven.
- All data points are monthly averages of daily logs (days I drove the car). I logged data before the charges. The data is sourced from the trip computer , dashboard and "hidden menu".
- Ambient temperature is the average for the trips, so may differ a little bit from the whether history for my location (Kyiv, Ukraine).
- The range estimate is calculated as follows. Suppose, I drove 108 km yesterday, started from 100% SOC and arrived with 35% SOC remaining. I divide 108 km by 65% (depth of discharge) to arrive at 166 km range estimate for this day. The result is more robust the more km I drive during the day.
- The battery capacity estimate calculation: I take 108 km of my mileage for the day and divide it by 8.7 km/kWh average efficiency from the trip computer to arrive at 12.41 kWh energy spent. Dividing this number by 65% depth of discharge, I get the estimate of 19.1 kWh.[/list]
So, based on the data, my battery capacity estimate went down from 18.2 in May 2018 to the current pre-reinitialization 16.4 kWh. The Batt.Kapa trend is very similar, albeit a lot smoother.
The range estimate is driven by the battery capacity and efficiency. It goes down in winter, and this summer is lower compared to 2018, reflecting the battery degradation.
The efficiency is driven by average speed and temperature, the former being a very weak predictor in my case (maybe 'cos my average speed is quite stable). The temperature could be used for forecasting the efficiency (R-squared = 0.93).