Hi Roger, thanks for the stimulating debate.
RogerCO wrote:
There we do differ - I think personal mobility (which could be virtual - through communication systems) is a very real benefit and helps the creation and maintenance of a civilization. Broadens experience, enables wider interactions. Sure we could go back to an earlier form of civilization where mobility - and thus knowledge and power - was concentrated in the hands of a few supported by a serf or slave class. I would like to see a post-oil civilization that maintained some of the democratic and personal freedom benefits that we acquired during the industrial period.
Perhaps we are talking in just different degrees of the same thing.
When I am saying "personal mobility" I am essentially meaning today's powered-cars used in the way we use them now.
I do think you have to qualify where the lines are drawn for individual mobility as a benifit to society - without qualification we could be talking about a 2500 mile road trip in a hummer as a benifit to society because we see some intersting stuff on the way and make a few new friends. I think you have to weight the cost of any mobility against it's real returns.
I do not think this means that knowledge and power would be restricted to just a lucky few.
RogerCO wrote:
Taking London as an easier example where it is relatively flat and journeys are relatively short - say 7M population with 2M electric cars each using a full charge (40miles) a day - thats 10kWh per car per day - mostly used at night. Charge rate is 1.5kW so you are needing 3GW (2million times one and half thousand) generating capacity available for 6 hours each night as a peak load. Spreading it out over the day that's an average load of 750MW - one largeish power station as against 40miles times 2million divided by 40mpg (optimistic for city driving) giving 2 million gallons of refined petrol used per day.
As I understand (please check or dispute figures) 2Mgallons oil (less refined) burnt in a powerstation would give you well over 1GW generating capacity - maybe even over the 3GW peak load - its a much more efficient use of oil as an energy source for personal transport.
And you could feasibly do it (750MW) with new renewable (wind) capacity.
These are back-of-a-fag-packet straw-man numbers that need checking and validating - I think its in the right area though.
Unfortunately I'm pushed for time so I'll have to leave these numbers to one side for now and take them as read. All I would say is that 10kwh is the current average daily power consumption per household in the Uk, and your example talks about doubling that ! Furthermore, the 750mw for london-only (2m cars) seems to do what I alluded to in my opener - that one person (or one city) can do it to their benifit but we all can't do it.
750mw for 2m cars = 9375mw for 25m cars ??
So either you say some people have to do without a car, in whcih case, who?
Or you say only london can use this scheme, in which case, what do the rest of the Uk do?
RogerCO wrote:
I agree about the batteries though - that is a problem. There is only a finite supply of lead.
And the processes to create the acids, the processes to build a LOT of actual batteries and, most importantly, the processes to recycle the batteries and their contents.
RogerCO wrote:
My thought is that moving to a vehicle with a relatively short range gets you away from long distance travel by car (use trains), then it is easier to see that you can do without altogether - a lot of people are discovering today that it is possible to walk home from central London.
I don't disagree, only that it strikes me as a very expensive way of achieving that mind-shift.
I think London is a good example of how you can have useful mobility without any car - the public transport system is fairly good.
My own take on personal mobility is that it should be a combination of a self-powered machine and public transport.
I don't want to see a return to the dark ages either and I agree that some mobility has value but I think that it has to be viable, sustainable and that any form of personal powered transport (with any current technologies) does not add up.
But I also ask, what's wrong with a push bike?
You can easily do a round-trip commute of 20m a day, which in a post-peak (more localised) world should be more than enough to get you to your place of work.
Since it's likely that a post-peak world will have less metropolis like london, the need to travel long distances often will be greatly reduced.
I agree that electronic communications can and should play a big part in the future - they can offer huge transfer of information and knowledge witout the need to transfer people to different places.
If you imagine a future UK with a more distrubted, localised, infrastructure where people live and work within (say) a 10m radius and most food and goods are produced in that local, then there is no reason why such a Uk cannot very high levels of science om technology skills, universities, centers of excellence, culture - it's just that you don't travel to most of these except under your own steam.
Holidays and occational trips to other parts of the Uk are viable using public transport so long as everyone doesn't want to do it all of the time.
I would like to think that the UK could transition to such a sustainable future, but as we have concurred, this seems most unlikely.
In which case we seem to face sleepwalking into a crisis - a shock - out of which can come many things, one of which is a revolutionised transport paradigm.
In the end then, I still do not see how Uk-wide electric powered cars fit into either the "we won't change now not ever" current mentality nor into a post-shock transportation world.
Inspite of my reservations tho, I would wholeheartly support the introduction of Gwiz-type cars as part of a national strategy of change, since I think this change is better than no change!