5 ms·
Depending on conditions, heat or AC can consume up to 5 or 6 kW in extreme weather and a small fraction of that in milder conditions. The most efficient speed o
by klaff 1mo ago
Depending on conditions, heat or AC can consume up to 5 or 6 kW in extreme weather and a small fraction of that in milder conditions. The most efficient speed of an EV is hard to pin down. If all fixed loads could be turned off, it would be most efficient at the slowest possible speed but with HVAC and compute loads present, the most efficient speed is around where the aerodynamic load is equal to the fixed load. That's still likely to be rather slow but the idealized math that gives this optimum is for steady-state operation. There is a round-trip loss for regen, so there is still an advantage to steady operation even if it is not as big as with ICE cars where no kinetic energy is recovered.
My guess for the poor reported number is excessive idle time w/ HVAC and compute stuff on within the trip interval.
- porphyra 1mo agoWeather can be arbitrarily extreme, but: 1. My whole house AC only consumes 3 kW when the outside is really hot, like 36 degrees C, and I seriously doubt that car AC can consume 5 or 6 kW 2. With hotter weather, the density of air also decreases and air resistance is reduced. This partially offsets the need for extra cooling (of both the occupants and the battery), so range is only perhaps impacted by 5-10%.
- klaff 1mo agoMax power consumption of the compressor in my car is 5.5 kW (see pg. 28 of https://www.scribd.com/document/783343319/MEB-220169869 https://www.scribd.com/document/783343319/MEB-220169869). The blowers would draw additional power. These values would only be hit in extremes and I'm not certain the compressor can run at 100% duty cycle.