Wait a second, if they're not powered by the drive train batteries then what are they powered by and where does that energy come from? If this is a vehicle with both electric and ICE then those accessories will be powered by one of the other system and either way running them is going to decrease range to some degree, the laws of energy mandate that. If you're sitting in traffic running all that stuff you absolutely are consuming energy that comes from *somewhere*. I do suspect though that the energy consumed by all this stuff is considerably less than the energy consumed by idling a conventional ICE.
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As has been stated several times EVs or at least the Volt has 2 banks of batteries. One for the power train and another for the creature comforts. In a Volt one can have a fully charged power train battery bank and not be able to power-on the car if the other battery bank is dead. They are completely independent of each other.
Just how much energy do you think it takes to pwoer an EV when stopped in traffic? All that's being powered during daylight hours are the computers, one display and in my case the sound system. Is that even 100 watts? (I don't know, but it's not a lot.) Now compare that to an ICE. How much heat is being generated by the running enging sitting in traffic? Again IDK for sure, but I'm guessing 2,000 - 5,000 watts? I'm thinking probably more.
I know when I park my ICE car in the garage the entire garage heats up. WHen I park my EV there's no increase in temperature.
Use some critical thinking skills. ICE cars when running generate a tremedous amout of heat. Aren't ICE only 20% or less efficient?
How efficient is an electric motor? Not eactly sure but aren't they 75% or more efficent? And then EVs have regenitive breaking, so KE gets coverneted back to PE when slowing down. To slow an ICE down only way to do it is to generate more heat with the breaking system which decreased range.
Does that pass your BS test?