Actual EV Range and Temp Relations

Thats about right!
This summer EV est. high 18.2 now below zero and single digits EV est. 11.1.

 

. Look at it my way: the days get longer in about 5 days,then Summer starts.

 

1. I had a test PiP the other day. At -4°C outside, cabin temperature set to LO, LED headlights on, 76m altitude difference, I’ve made 12km on EV. I believe EV range is nearly linearly proportional to the outside temperature, given no other variables change (same car, same route, traffic conditions, red lights, load weight etc.).

2. You have statistically too little attempts on too narrow temperature range, to estimate the type of EV Range vs. Temperature relation reliably. I hardly believe the triple polynomial is the real relation as most physical processes are described with linear, squared, logarithmic or exponential relations. The only two of the high-school physics formulas I remember to be of the third order polynomial kind are volume vs. radius and force of gravity vs. distance (inverse). You were perhaps to eager to make the best fit and forgot the fact you actually started fitting to the measurement error along the way.

My PiP is scheduled for April 2014. In my climate the outside temperatures range from -10°C to +35°C. I might contribute with the data I measure.

 

The more data and discussion, the better. Keep it constructive, guys.

 

if you follow giora's line down and to the left, it looks like -4c corresponds to 12km?

that's terrible! are you sure the battery was fully charged?

 

Good stuff! I've been getting about 12-12.5 miles of range on some very hilly and cold commutes the last week or so. Can't wait until the temps go up!

 

50 here today, went 14.2 miles. whoopee!!!

 

Giora sorry, I didn't want to step on anybody's toes. Just perhaps too strong choice of words, trying to tell you to drop the idea of triple order polynomial and pergaps get some more measurement in more extreme temperatures. Although it wasn't obvious, I do appretiate your work. I believe it took you a year or more, to collect the data on the full range of temperatures in your climate.

Bisco, the battery was actually full. But cold. Anyway, I am pleased to see this was the worst case scenario and I can expect only better.

 

62 deg F today. Did my 9.9 miles morning trip. Display said 3.5 miles remaining.

It is raining and I drove slower. Max speed I reached was probably 55 mph. I climbed the bridge at 45 mph requiring half HSI EV power bar. On a rush day, I would climb at 55 mph with HSI bar at 80% power.

 

this is right in line with what i'm seeing. are you trending warmer or cooler?

 

Ah! Warm.....

 

12 degrees out...and out of range (but I had a warm engine). So I pulled out the old pulse and glide tricks and did 78 mpg over about 7 miles. (virtually no elevation change)

 

shaweeeeeet!

 

2.7 miles to coffee all EV -15 below no ICE. Heated garage 45 degrees. Will see what happens after coffee.

 

i know what happens after coffee.

 

keep us updated