4 ms·
ICE efficiency brings that down a decent amount, no? 35-40% at best. The fuel is much more dense, but converting it is not as efficient.
by jdhawk 8y ago
ICE efficiency brings that down a decent amount, no? 35-40% at best. The fuel is much more dense, but converting it is not as efficient.
- prolepunk 8y agoBack of the napkin calculation Ice is 18% efficient at the wheels. So the energy spent on propelling the car is 46*0.18 = 8.28MJ/Kg Let's say efficiency of electric car is 60%, 8.28/0.6 = 13.8 MJ/kg. In order to have batteries occupying the same amount of space as gas tank they need to be almost 7 times as energy dense. But then it's possible to get rid of a lot of other systems that support ICE engine, like transmission, cooling, lubrication, led acid batteries engine itself is a lot smaller.
- prolepunk 8y agoEven more, electric engines don't use any fuel at idle, so I for city driving batteries can be even less dense.
- NegativeLatency 8y agoEspecially in an older car with a less efficient engine.
- akira2501 8y ago> ICE efficiency brings that down a decent amount, no? In terms of power to the wheels, yes. Some of that latent energy can be useful, especially after it's converted into heat.
- hwillis 8y agoRoughly 15-20% during actual driving.