Hmm... Hard to beat that energy density when the workload is large.
Trucks, tractors, planes, ships. Sure consumer cars will be EV but ICEs are not going anywhere
Trucks, tractors, planes, ships. Sure consumer cars will be EV but ICEs are not going anywhere
Currently gasoline has about 50x more energy per unit weight than a tesla battery pack.
Battery energy densities have tripled in the past 10 years. Keeping on that pace, it would take over 30 years for batteries to be competitive with gas.
When you account for the astoundingly bad efficiency of ICE, though, the gap in usable energy decreases. This is why a tesla can go 300+ miles with a battery that can only store the same energy as 2.4 gallons of gas.
If there's one thing that EVs are not, is "light". Model S ranges from 4,561 to 4,941 lbs. A model 3, 3,648 to 4,250 lbs. A Nissan Leaf - 3,538 to 3,946 lbs.
In comparison, a Honda Civic weights 2,771 to 3,012 lbs.
Regenerative breaking is nice but it's very dependent on the particular drive and terrain. Heaters are power hungry as there is very little waste heat that can be used (again, due to the high efficiency), unless they are heat pumps.
The main reason they can go so far with so little energy is the efficiency of electric motors.
> as hydrogen has similar power/weight characteristics to gas
No it doesn't! It has horrible energy density per volume, compared to any gas or liquid fuels. You can improve this by using high pressures (energy loss) or cryogenics (even more energy loss). But it's pretty bad to begin with. Turns out that the best way to store hydrogen is by adding some carbon atoms to it.
Obviously we are not comparing about the weight of an EV compared to an apple or vehicle that doesn't require a battery. We are talking about extreme measures taken to make the car lighter so it can improve range. Replacing cheaper steel with more expensive aluminum, reducing even surface area of plastics, reducing wires. Truly amazing steps were taken to reduce weight.
> No it doesn't! It has horrible energy density per volume,
volume? Seriously? "The energy in 2.2 pounds (1 kilogram) of hydrogen gas is about the same as the energy in 1 gallon (6.2 pounds, 2.8 kilograms) of gasoline." https://afdc.energy.gov/fuels/hydrogen_basics.html
Source: http://www.uigi.com/h2_conv.html
Well, yeah that was my original intention. Teslas get comparable range to ICE vehicles while using less than 3 gallons of gas. That comparison to ICE vehicles demonstrates the efficiency of electric vehicles.
Efficiency plays role for our day to day car tasks, but when you have to deal with external forces or higher requirements of momentum, then you need more energy period. Towing, beating high-speed drag / waves, climbing high, cannot be addressed with smarter design. You need to be able to store somehow enough energy to deal with these external forces / additional required momentum
Yes. However, the Carnot efficiency means that most of it is lost as heat. Suddenly the advantage is not that large anymore.
F150 can tow 13,000 pounds and has a 27 gallon tank (almost 10 Tesla’s).