But it don’t seem to add up. How many watts does vehicle need to keep the cab at 75 degrees F for 18 hours?
How many watts continuously? And that is all converted to heat.
Both the good and the bad — because a gasoline engine is inefficient and produces a lot of excess heat which can be exchanged in the cooling system, a person can be very cozy warm in the winter. An EV is a lot more efficient with less excess heat (wasted energy) so the passengers freeze. I picture a 2000 watt heating element plugged into the battery. I don’t know how it is done in an EV but it is probably something that simple.
At least that is my theory and I am sticking to it. :)
All come with a 100 kWh battery. If you have the Long Range variant – which has an impressive range of 412 miles – it costs $15.29 for a full charge based on electricity prices of $0.13 per kWh and 85% charging efficiency.
https://bikehike.org/how-many-watts-in-a-tesla-battery/
Naturally that is assuming you are running a 750 kWatt heater Continuously and that the cab has zero insulation- which are pretty obviously false assumptions
You are underestimating how good modern lithium carbonate/perchlorate batteries are, how long they last, and how efficient they work - which is understandable. Most people have experience based on metal hydride, or Nickel Cadmium batteries.
The batteries in a 2020 and beyond Tesla should maintain 80% Charge capacity after a million miles worth of charging