I'm not saying that we won't need a country-wide network of charging points, but I think we're in danger of assuming too much use of them by thinking of the use that fuel pumps get.
I'm not saying that we won't need a country-wide network of charging points, but I think we're in danger of assuming too much use of them by thinking of the use that fuel pumps get.
Rather than speculate about what others must surely do, if your car magically had a full tank of petrol or diseasel every morning you woke up, how many times so far this year would you have needed to visit a filling station?
It is not totally and utterly irrelevant.Rather than refer to the point under discussion BAS brings up something that is totally and utterly irrelevant, and then he wonders why people get annoyed at him.
Indeed they do.For the sake of clarity, I will explain further. I am not speculating at all but drawing a logical conclusion. If the average journey is 10 miles and cars on average do an absolute minimum of 21 miles a day then some journeys have to be longer than 10 miles*.
How often does he need such a range?As I have experience of my own life and that of many friends & family I know that people who make lots of short journeys (commuting, shopping, etc) also do longer journeys. As @davelx points out, he needs a range of at least 250 miles.
Does she do that every day? Once a week? Once every two? Just now and then?My wife visited her parents for the day last week, a round trip of 190 miles.
One overvolt re-charge can all but destroy a battery. Will all public re-charging points be able to recognise the type of battery in the vehicle and set the maximum voltage acccordingly to avoid damaging the battery ?.
Yes, but ...I'm not saying that we won't need a country-wide network of charging points, but I think we're in danger of assuming too much use of them by thinking of the use that fuel pumps get.
1l of petrol is 9.5kWh, 1l of diesel is 9.9 (https://en.wikipedia.org/wiki/Energy_density#Energy_density_in_energy_storage_and_in_fuel).so lets say 50 of them want to charge. 50 x 25 = 1,250 kW = 1.25 MW for a single supermarket.
It is not totally and utterly irrelevant.
OK, but if you have no idea what it is it's a bit pointless you trying to pontificate about the problems associated with it.@flameport said that hardly anyone ever drives more than 100 miles in a day and therefore a range of 100 miles is sufficient. He based this on a flawed use of statistics. For his comparison (to a range of 100 miles) he used the mean journey distance of 10 miles whereas the correct comparison is against the median.
I have no idea what the median is but, as I showed, it has to be quite a bit greater than 10 miles.
t it is it's a bit pointless you trying to pontificate about the problems associated with it.
That's beyond the next election, so politicians don't seem to be bothered about making one But more seriously the stated policy is (IMO) a load of hype and sooner or later it will be quietly forgotten about - when people start to point out the real and insurmountable (or at least, exceedingly eye wateringly expensive to deal with) problems - not least, where all this lecky will come from when it's "the wrong kind of wind" for the magic windmills. EVs will gain ground, but as the old saying goes, reports of the death of the IC engine are grossly exaggerated.So - what is the plan for when they stop making IC cars?
I recalled that the effective transfer rate is exceedingly high, but CBA to find the figures - thanks for doing that. It does show just why we use these very energy dense liquid fuels for mobile applications1l of petrol is 9.5kWh, 1l of diesel is 9.9 (https://en.wikipedia.org/wiki/Energy_density#Energy_density_in_energy_storage_and_in_fuel).
If we use the less onerous petrol figure, and assume that a pump transfers 1l/s, , that makes each pump a 9.5kWh/s, i.e. 34.2MW appliance. If you want to use a 30% efficiency factor, then it's a 10.26MW one.
No, because it is not.And do I take it that you now accept that what you wrote was irrelevant?
And while I'm sure there's been research into electric trucks - it would be interesting to see the battery requirements for a viable "all day" vehicle.
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