Cold weather range loss update

[teslarati97]

Wintery cold weather update at 0.96mi/kWh for the U25 BEV!

In fairness I charged at 35F and drove around -3F (cold soaked outside), so the pack voltage dropped so after adjusting for cold capacity loss it's closer to 1.34mi/kWh. That gives the U25 BEV a working 100% SoC range of 87 miles. Not too shabby...

If you keep it in the 80% SoC, then the usable range drops to 70 miles or so. For the F56 BEV, it was less impacted.

 

[Puppethead]

Does the U25 use CATL batteries? I think having those is a big part of why the F56 SE does so well in cold weather.

 

[teslarati97]

Does the U25 use CATL batteries? I think having those is a big part of why the F56 SE does so well in cold weather.

Yes to CATL, but a different cell chemistry (higher nickel %) and cell dimension. As far as I can tell the J01 and J05 are using SVOLT.

Charging the U25 on Level 2 AC I miraculously regained the lost SoC %. Just the fact of life when cell voltages drop due to cold temperatures.

 

[teslarati97]

Confirmed again. I charged to 100% when it was about 4F and drove when it was -4F. Voltage lowered and I immediately lost 10% SoC. Ambient temperatures don't really make a difference because the battery temp is warmer when charged. I'll remember to charge to 100% more often during the winter instead of 80% limit.

After adjusting for capacity loss, the efficiency is 1.23mi/kWh for -4F. I'm happy to report that the vehicle heats up extremely well! Just make sure to turn off A/C if you use the front defrost button. Kind of annoying that you can't tell immediately without going into the climate menu.