World's first fully electric bus fleet quietens Chinese megacity

Re:World's first fully electric bus fleet quietens Chinese m... by blake1 on Sunday December 16, 2018 @09:39PM (#18696554)

Transmission loses 1-2%, batteries lose maybe 5%. Compare that to 30% losses for an ICE, above generator losses.

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Re:World's first fully electric bus fleet quietens Chinese m... by jondumbau on Monday December 17, 2018 @03:27AM (#18697634)

30% is the efficiency of the energy in fuel being turned into work.

You need to consider the efficiency of the power generation, power lines, battery and then the electric motor. Any other comparison is misleading.

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Re:World's first fully electric bus fleet quietens Chinese m... by blake1 on Monday December 17, 2018 @03:15PM (#18701783)

Correct that his is thermal efficiency, and I apologize for not breaking into out earlier.

An ICE is ~20% efficient.

A combined cycle gas turbine is ~60% efficient, transmission systems ~98%, LiIon ~99%, motors around 85-90%. The first is thermal, the rest are electrical. Well-to-wheel this is about 50%.

My point was just that you really do get a large efficiency improvement (50 - 20 = 30) by electrifying cars. Climate argument aside, energy is simply being wasted.

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Re:World's first fully electric bus fleet quietens Chinese m... by kalleboo on Monday December 17, 2018 @08:05AM (#18698698)

And gasoline has efficiency of exploring, pumping, refining and transferring it (tankers, pipelines, trucks to the gas station)

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