Lately I have read about two ways to store electricity to use later for heating and cooling and it got me thinking about how it could be applied to EVs. One can store electricity in the form of ice to later use for cooling. One can store electricity as heat in ceramic bricks to later use for heating. These two methods have been around for years and are relatively cheap, so instead of using the battery to store electricity to use for heating and cooling one could buy a hot weather or cold weather package depending on where one lives.
So a person in Florida could buy a package that at night uses off peak electricity to create ice in the frunk that would be used for cooling the car instead of wasting electricity stored in the battery. A person in Canada could have an electric thermal storage heater that heats up at night with off peak electricity that could be used to heat the cabin and battery. Both could be built so the heavy parts could be removed from the car during temperate weather.
Now I realize the Tesla air conditioner is probably more efficient than these devices, but this is really more about maximizing stored kWh than efficiency. The cost, weight, and volume of the battery vs the cost, weight, volume of this storage per kWh is really the deciding factor on whether this type of system makes sense. So, and these are just wild guesses, the option might cost $1000 and provide an extra 10 kWh to use for heating or cooling which is $100/kWh. In places like Florida or Texas the standard heater is sufficient and there is no need for stored heat and vice versa. Also, this is not that big a deal for the 85 kWh Model S, but the 3rd generation Tesla will need every kWh to get 200 miles of range.
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