Few months ago I bought an Rixe Cross XC 4.0 bicycle from a local dealer. As a test-drive, I just drove couple rounds around the block and was immadiately sold. They gave me options to choose any Rixe bike and they would do the conversion for electric. I opted for XC 4.0 because it has hydraulic disk-brakes and basic suspension in front fork. I imagined that it would be nice to have a decent bike for winter commuting.
So far I have driven about 750 km’s with the bike and have been very satisfied with it. My normal commute is about 2 x 10 km (from the city of Tampere to the city of Nokia) and in the summertime I can easily do 2 round-trips (eg. 40+ km) with one charge. But during wintertime I have noticed that range drops dramaticaly.
When I last charged from fully empty battery I had 500 km on the odometer and it was quite a bit warmer than now. From empty to full I charged about 10.484 Ah / 418.4 Wh, end voltage being 42,06V. So the capacity seems to be roughly about 10 Ah.
Measurements were done with simple Turnigy Watt-meter from Hobbyking. It seems to be perfect little device for these measurements.
Now when it’s wintertime I measured my charge after one 20 km roundtrip. It seems to eat about 7.511 Ah / 304.9 Wh after only 20 km of driving! So it seems that during wintertime the bike is using significantly more energy. It’s of course partly because higher resistance when driving through snow – even about 5 cm seems to affect a lot (as every wintercyclist already know). Sometimes roads over here get anything between 5-15 cm’s of snow.
Some capacity loss (or better, voltage drop) is generated also because lower temperatures – lithium batteries do not cope well with cold. So I made a little “blanket” that keeps the battery warm
This seems to affect range, now I get little more range and a little bit better performance – at least until the battery cools down. But as I charge during a workday in my warm workshop and keep the bike in warm place also in nights, this little blanket works fine.