GRA said:
Oh, hell, I can't resist. The highlighted section may be adequate for Canada, but not for the U.S. Most states west of the Mississippi have 75 mph speed limits on rural interstates, and most people drive 4-5 mph over the limit. Four (Utah/Idaho/Wyoming/Texas) now have 80 mph limits with more possibly to follow, with Texas also having at least one toll road at 85 mph. We agree that four hours (plus a reserve) is what's needed, but 4 x 75 = 300, call it 330 with a reserve, and 4 x 80 = 320, 350 w/reserve. And that's before you start taking account of degradation, colder temps, heater/defroster use, hills, headwinds etc. Even if a Tesla S had double its current rated range, 530 miles instead of 265 (and that's at 65 mph), it would barely have enough to meet the 80 mph requirement in other than ideal conditions. At the battery's EoL, forget it: 530 x 0.7 (EoL) = 371 miles, x 0.9 ('normal' range charge %) = 333.9 before any other reductions. More efficient heating and/or better insulation, or else much reduced drag, will be required to give any BEV the sort of road trip range that most ICEs can do now, and that's assuming no great decrease in charging times; faster battery charging will require storage at site, because otherwise the demand charges will be huge.
Barring the arrival of such a battery, battery leasing with battery swap would be the only way to provide ICE like road trip capability, and that will require that multiple manufacturers agree to use standardized battery packs, which isn't likely anytime soon. If you did have such swapping, most people would be comfortable with a two hour range plus reserve at the above speeds, because they'd only be off the highway for 5-10 minutes at a time, not so much that they have to find something to do while they wait. This would allow most weekend getaways with no more than a single swap (or charge of the same time limit). You can do those weekend getaways now with an S85 if you're willing to stop for 30 minutes or so once, which is generally not a problem as most people can schedule a meal during them. You can even do them with 60s, if it's not too mountainous/cold. But for multi-day road tripping where you've got to cover serious distances, much bigger batteries/swapping will be required to replace ICEs.
I get everything you are saying, I know it can be done. I wasn't trying to come off saying it couldn't be done. I just don't see it happening in this market before there are other things that the general population gets use to such as fuel cells, either as a pure fuel cell car or a PHEV fuel car or sticking with gasoline PHEV. I think the typical type of person who would demand what you asked with your math above would never settle for a pure BEV ever and if they built one for him/her they would laugh at the price and walk away. Once we get over the average compact BEV at 200 miles and the avg Family BEV at 250@80% I think the mass market for pure BEV, at least without gasoline being regulated out and hydrogen failing, will be dominated by people wanting to save money on the purchase price of the car over extending the range. I think Tesla will continue with a niche of $100,000 cars that never change much in price but get very long range and the Germans will probably follow suit with s class, A8s and 7 series models but it will eventually reach a point where there's no more money to be made in adding more battery capacity. There has to be a saturation point for everything. After all we could easily put a tank in a car that lets it go 2000 miles but no one does because the trade offs aren't worth it, it won't help them sell cars. BEVs will have something similar and I think that the price and weight of the pack to get them to the point of where people don't think about range will be crazy high when compared to alternative energy sources.
IMHO all that is why people are backing hydrogen. I know it's not a popular topic here, I think BEVs are best but when you throw all that out there the best answer to satisfy the fill anywhere go as far as you want is a dense liquid or gas energy source that doesn't change in size/weight/price in direct relationship to range added. It also doesn't have diminishing total efficiency every time you extend the range by a new amount.
As the cost per kWh of batteries comes down the bottom line is that max range can only really be extended in the numbers we are talking about here by adding more kWh storage capacity. Aero drag, weight, electrical efficiency, charging efficiency, heater use, rolling resistance. None of the potential of improving that stuff added up could double the range. The more battery you add the less efficient the car gets due to weight so the more $/mile range it costs you. A range extender of any type on liquid/gas energy is the cost and weight of the system for infinite range. The time cost of that infinite range is total_trip_distance/range_of_on_board_fuel*(2 to 10 min).
With your numbers if we are talking BEVs capturing a large market share in the future and getting more reliable and cheaper enough to go those ranges one of the things you have to factor in is for them to make it they need to improve EOL. 70% is not going to cut it.
How often do you think people take drives like that, 2 x 4 hr legs at 85 mph? How much do you think being able to do that in the car they also commute to work in is worth to them? Once you hit 200 mile range in a $20,000 car what do you think the cost increase to go 400 miles will be vs. a back up energy source, either ICE or fuel cell? Once(if) we get the hydrogen network up for fuel cell we can also use hydrogen in an ICE if the fuel cell stacks don't come down in price.
And FYI while Canada does have a 62 mph (100 km/hr) limit (some at 68 I think but not around me), we are pretty lax on speeding in Ontario. 75 is the norm and there's a good chance you won't get pulled over until you go over 81. Pre my prius/leaf days I drove an 80 mile commute at 90 mph for 5 years and never got pulled over once. I knew all the spots the cops liked and would slow down under 80 around them, went by many. We also just went to a higher highway speed (80mph max I think) on our 2015 fuel economy tests.