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I think they are referring to energy efficiency. If I remember correctly gas cars lose about 80% of their energy propelling you forward but EVs only lose about

by mdeeks 3y ago

I think they are referring to energy efficiency. If I remember correctly gas cars lose about 80% of their energy propelling you forward but EVs only lose about 10-20%. My numbers might not be exact but that’s the general range.

jtriangle 3y ago
Best case EV charging is about 80% efficient from the grid, power transmission losses are 7-14% depending on your local grid, EV power usage, from the batteries, is also somewhere around 80% Efficient Gasoline engines come in at 25-30% efficient, Diesel somewhere around 35%. Hybrids can boost that some, because they can scavenge energy that'd otherwise be lost, but only somewhere between 5 and 15% in real world scenarios.
- mdeeks 3y ago
  Article I just read says they score EVs higher because of regenerative breaking. 87-91% go to the wheels. In any case, very efficient. https://www.motortrend.com/uploads/2022/08/Screen-Shot-2022-08-12-at-3.46.59-PM.png?w=393 https://www.motortrend.com/uploads/2022/08/Screen-Shot-2022-...
- jbm 3y ago
  On a tangent, I've been spending the past month looking to see any form of charging I can do from a solar panel to the car without conversion losses and coming up blank. The battery is DC, the panel is DC; but you can't do direct DC charging at home, so you end up with DC -> AC -> DC. It would be nice to get that last 20% efficiency back but I haven't found it.
  - jtriangle 3y ago
    You'd have to be able to convince the car that you're able to provide DC charging. Far from an impossibility, but a very roll your own kindof system, and you'll likely need some beefy DC/DC converters to do so. You could also, similarly, subvert the car entirely and just disconnect it from the car, charge it from the panels/DC converter, and reconnect it when finished.
  - ChrisMarshallNY 3y ago
    I'm pretty sure that superchargers are DC.
    - jbm 3y ago
      Unfortunately they don't sell supercharger components at home (and I won't be installing a battery to get that 150kw capacity at home). On a side note, I don't want to necessarily fast charge the car; I just want to use the electricity from my solar panel in the most efficient possible way; that would be heating water, powering stuff in the house and charging my car; the last of which probably would take the most electricity.
- cyberax 3y ago
  > Best case EV charging is about 80% efficient from the grid, power transmission losses are 7-14% depending on your local grid, EV power usage, from the batteries, is also somewhere around 80% Pure BS. Tesla is at 95% from outlet to battery on 240V, and it can be even more (depending on the need to run cooling/heating). Grid transmission losses average at around 5% nationally, but it heavily depends on the location.

by mdeeks 3y ago

jtriangle 3y ago

Best case EV charging is about 80% efficient from the grid, power transmission losses are 7-14% depending on your local grid, EV power usage, from the batteries, is also somewhere around 80% Efficient Gasoline engines come in at 25-30% efficient, Diesel somewhere around 35%. Hybrids can boost that some, because they can scavenge energy that'd otherwise be lost, but only somewhere between 5 and 15% in real world scenarios.

mdeeks 3y ago
Article I just read says they score EVs higher because of regenerative breaking. 87-91% go to the wheels. In any case, very efficient. https://www.motortrend.com/uploads/2022/08/Screen-Shot-2022-08-12-at-3.46.59-PM.png?w=393 https://www.motortrend.com/uploads/2022/08/Screen-Shot-2022-...
jbm 3y ago
On a tangent, I've been spending the past month looking to see any form of charging I can do from a solar panel to the car without conversion losses and coming up blank. The battery is DC, the panel is DC; but you can't do direct DC charging at home, so you end up with DC -> AC -> DC. It would be nice to get that last 20% efficiency back but I haven't found it.
- jtriangle 3y ago
  You'd have to be able to convince the car that you're able to provide DC charging. Far from an impossibility, but a very roll your own kindof system, and you'll likely need some beefy DC/DC converters to do so. You could also, similarly, subvert the car entirely and just disconnect it from the car, charge it from the panels/DC converter, and reconnect it when finished.
- ChrisMarshallNY 3y ago
  I'm pretty sure that superchargers are DC.
  - jbm 3y ago
    Unfortunately they don't sell supercharger components at home (and I won't be installing a battery to get that 150kw capacity at home). On a side note, I don't want to necessarily fast charge the car; I just want to use the electricity from my solar panel in the most efficient possible way; that would be heating water, powering stuff in the house and charging my car; the last of which probably would take the most electricity.
cyberax 3y ago
> Best case EV charging is about 80% efficient from the grid, power transmission losses are 7-14% depending on your local grid, EV power usage, from the batteries, is also somewhere around 80% Pure BS. Tesla is at 95% from outlet to battery on 240V, and it can be even more (depending on the need to run cooling/heating). Grid transmission losses average at around 5% nationally, but it heavily depends on the location.