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We don't need to replace primary energy with electric energy in a 1:1 ratio. An ICE car is 20-30% efficient, an EV is 90% efficient. Generally we are looking a
by ViewTrick1002 2y ago
We don't need to replace primary energy with electric energy in a 1:1 ratio.
An ICE car is 20-30% efficient, an EV is 90% efficient. Generally we are looking at a grid expansion, but it is not massive.
See this amazing chart on rejected vs. useful energy:
https://flowcharts.llnl.gov/ https://flowcharts.llnl.gov/
- WalterBright 2y ago> an EV is 90% efficient An EV is 85-90% efficient with power coming out of the batteries. However, the charging efficiency of the batteries is at about 80%. So the overall efficiency is 80% of 90%, or 72%.
- heavenlyblue 2y agoFor the sake of replacement, we should not include the charging efficiency, because the context is that of "how kuch energy the car can store" rather than "where it comes from"
- Scarblac 2y agoIt's "how much is needed to keep doing the same thing", I don't see why charging would be excluded.
- WalterBright 2y agoIt is not about how much it can store. You cannot wish away the charging losses. There are no losses to pumping gas into a tank. Nor can you wish away the losses in the charger itself. Converting AC to DC is hardly 100% efficient.
- pfdietz 2y agoIn that case, you should also not wish away refining losses, where petroleum is turned into gasoline and other fuels.
- WalterBright 2y agoIf you want to get an accurate accounting of CO2 emissions, sure.