Den 2018-01-08 kl. 20:22, skrev Bill Gunshannon:
On 01/08/2018 11:48 AM, DaveFroble wrote:
chrisv wrote:
Doomsdrzej, AKA "Slimer", wrote:

nospam wrote:
the batteries are heated and shortly before leaving, you can preheat
the cabin via a smartphone app.
_How_ are they heated?
via a heater module on the batteries.

Which is fine, if you're plugged-in.Â* Otherwise, you're sucking
battery power.

Pre-heating the cabin essentially means that you've turned on the car
remotely. However, this is only possible if the car starts which, of
course, often requires the batteries to be heated.
for a gas powered vehicle, the engine must be running.

not true for an electric vehicle.
Very interesting to know, thanks.

Well, duh.Â* The heater's not working off from engine coolant...


Think about this.Â* That waste heat wasn't free.Â* It's unused energy. That
means you've had to put much more potential into the gasoline engine to
get what you need.Â* With electric, less energy is required. Of course,
the heat is nice when it's cold.Â* Still, from an energy perspective, the
gasoline engine is rather wasteful.


Try tracing the power from the battery in the car all the way back
to it's origination.Â* Take all the "efficiencies" into consideration.
Now tell me how wasteful the gasoline engine really is.

bill


The problem is not efficient of the engine is as such. The problem is
that it in most cases is burning fosile fules and releasing CO2 that
was "in the loop" millions of years ago.

If you run the gasoline engine on bio-fuels produced from plants
growing *today*, there is no issue with the C02 emissions.