Re: can't deal with the idea of a motor vehicle not using gasoline
ok you get an upvote but the point I was making was that moving the pollution from the exhaust pipe to somewhere out of sight does not make it better.
Petrol \ Gasoline engines run about 25-30% thermal efficency, diesel about 40-50% but you have to factory in energy density of the fuel as well. Gasoline runs at 46MJ/KG whereas a Liion battery runs .072 MJ \ KG, thats 63 times higher density. Yes the batteries will get better, but it still won't affect the damage done during the mining, refining, production, reconditioning and disposal stages.
The reasons for moving away from gasoline pretty much are
1- Environmental sustainability.
2- Gas prices rising.
3- Domestic control (less of a factor now with the shale oil boom).
Batteries get slayed on all 3 (there are probably more). We import them, they're hideously expensive and wreck the environment.
To give you an idea of the alternative I was suggesting, and this is just spitballing, I would suggest the following.
The US has large tracts of desert, setup farms using algae to convert co2, sunlight and water to a biofuel. Running this in something similar to a diesel engine would satisfy all 3 points I mentioned plus it wouldn't require a huge investment in a national distribution infrastructure. It would get the benefit of the energy density of chemical fuels, the environmental benefits of being carbon neutral and be under domestic control. It shouldn't impact food pricing like ethanol in gas, it just makes more sense all round no? This is something we already have the technology to do, it's a far better start point than batteries and would be cheaper allowing for wider adoption.
Just out of curiosity, how heavy would the battery need to be on an 18 wheeler! :) rough math for a 475hp 350kw power plant, assuming 6mpg, 7.15 lbs per gallon diesel, 300 gallon tank, 100% efficiency for the battery, 40% for the diesel. That would put it at something like 974KG of diesel vs 24545KG of battery (although this will obviously improve over time). I would not want to be buying that battery pack!! :)