I've read a lot of the cold weather range threads and still feel unfulfilled.
Prior to being an owner, I read that the majority of energy loss in cold weather was not poor cell performance, but cabin heating. Now I have a MYP with heat pump and have watched the 75 minute Weberauto youtube on the heat pump (very impressive!), I am convinced that at highway speeds, there is enough heat recovered (1KW) to give the heat pump a COP of >2, I am thinking this would mean ~750 watts for cabin heating, compared to 20KW being burned up by the drive train to cabin loss is small. The part that makes my head explode is how much heating do the batteries need at highway speeds (and say 10F)? If they are self sustaining due to internal dissipation, there should not be much heating required from the cell energy. Yet I still see many comments that cold weather loss will be 20-30%+. Are there any charts on cell capacity (range) vs temp (with heatpump). Certainly cell pre conditioning for departure will be a factor, at least at the start.
Background. I work at a ski resort. On sunday morning, bright and early I drive 15 miles 2000' uphill. The car is cold soaked in mid vermont, for 10 hours. When finished work, I descend the 15 miles, 2000' to my 2nd home. I then need to drive 180 miles to my primary residence (little to no time to top off). I have been able to do this with 85% charge in warm weather, I am not sure I will make it in the cold. If I can't make it, I have to divert 30 minutes out of the way to hit a supercharger.
FWIW, I am a retired electronics designer. My last project was a lithium ion pack, it used Samsung INR1650. This chemistry at 30F had a fully charged capacity of.....ZERO!
Prior to being an owner, I read that the majority of energy loss in cold weather was not poor cell performance, but cabin heating. Now I have a MYP with heat pump and have watched the 75 minute Weberauto youtube on the heat pump (very impressive!), I am convinced that at highway speeds, there is enough heat recovered (1KW) to give the heat pump a COP of >2, I am thinking this would mean ~750 watts for cabin heating, compared to 20KW being burned up by the drive train to cabin loss is small. The part that makes my head explode is how much heating do the batteries need at highway speeds (and say 10F)? If they are self sustaining due to internal dissipation, there should not be much heating required from the cell energy. Yet I still see many comments that cold weather loss will be 20-30%+. Are there any charts on cell capacity (range) vs temp (with heatpump). Certainly cell pre conditioning for departure will be a factor, at least at the start.
Background. I work at a ski resort. On sunday morning, bright and early I drive 15 miles 2000' uphill. The car is cold soaked in mid vermont, for 10 hours. When finished work, I descend the 15 miles, 2000' to my 2nd home. I then need to drive 180 miles to my primary residence (little to no time to top off). I have been able to do this with 85% charge in warm weather, I am not sure I will make it in the cold. If I can't make it, I have to divert 30 minutes out of the way to hit a supercharger.
FWIW, I am a retired electronics designer. My last project was a lithium ion pack, it used Samsung INR1650. This chemistry at 30F had a fully charged capacity of.....ZERO!