Sunday, November 1, 2020

Winter is Coming.

I like to break up the measurement of power efficiency (Wh/mi) into two distinct seasons - summer and winter. But, since I live in a place with four seasons, basically I am using the Daylight Savings Time (DST) switch over as the time to reset one of the trip counters in my Model 3 to keep track of average energy consumption. I am rather happy with the performance of the vehicle over the 2020 spring and summer.

March to October (DST) consumption

Averaged 248 Wh/mi for over 4,899 miles of driving. consuming 1,216kWh of energy. 

By comparison my solar panels made ~7.5MWh during the same period, in fact just the solar production during the month of July 2020 covered all the energy consumed by the car. 

The lifetime consumption at the same time was

 269 Wh/mi over 7,111 miles and that includes the winter of 2019 and start of 2020.

It will be interesting to see how Winter 2020/2021go. I don't always get a chance to fully pre-warm the car before every single trip, especially the shorter trips around town.

The aero benefits will not out perform the need to keep the battery and cabin warm when it is between 0-20F outside. Curious to see how these numbers change.