Fully Electric Car available soon

[The Natural Philosopher]

Agreed.

[The Natural Philosopher]

Oh definitely, even equipped only with a bicycle.;-)

[The Natural Philosopher]

No. its lost a few things since then.apart from two doors ...the engine is different, the gearbox and diff are different..the whole thing is electrnically controlled..

Not quite true, a supercharged small engine MAY have less frictional losses than a normally aspirated bigger one of the same power, and also weigh less.

[The Natural Philosopher]

Heating comes free. Cooling emphatically does not.

A fairly well insulated electric car could in principle use the few hundred watts of waste heat to keep it warm. Cooling takes power whatever you do.

Agreed. So expect more attention to be paid to things like insulation, darkened glass, and double glazing.

Also, if lighter car BODIES are made, the need for excessivley large tyres for grip falls away. There are gains to be made on *all* cars by reducing weight..

[The Natural Philosopher]

to recharge a 50KWh battery in say 5 minutes takes 600Kw. 2400A. at 250v.

Not impossible, but not trivial either.

[Steve Firth]

Try providing some proof that a vehicle at rest is 100% efficient.

It will involve mathematics, so I'm willing to take a break from yoru drivel while you go back to school.

[Steve Firth]

Indeed you are, and remain so. Only a f****it would think that failing to quote something would erase it.

[Doctor Drivel]

There is zero loss, so 100% efficient. Boy is this shit kicker dumb!

[Doctor Drivel]

This is encouraging. Self awareness. Only when he realises his problem can he face it, and overcome it.

[Steve Firth]

How far has the vehicle travelled?

[Steve Firth]

You can snip but you can't hide from your own stupidity.

[Doctor Drivel]

This is sad. He is really that dumb. I blame the parents.

[Doctor Drivel]

The problem is getting him to realise his problem. Difficult I know.

[John Stumbles]

Or a less unreasonable 800A per phase 3 phase, or 450A per phase at 440V

That's going to be forecourt technology, with a cable as thick as a petrol/diesel filling hose!

However one could envisage the forecourt operators and vehicle designers conspiring together to offer slower (30 - 60 minute, but still faster than at-home) charging tied to supermarkets, cafes etc so that the punters form a captive market for the retail offering while waiting for their vehicle to charge up.

One would expect to pay more per kWH for the convenience (and the operator's investment in the infrastructure) with the cheaper, slower option of charging up at home from a more modestly rated home outlet, or trickle/very-slow charging/topping up from a standard (13-15A-ish) mains outlet. Of course if electric vehicles acheive a true mass-market there will be lots of people for whom home charging is simply not an option since they don't have off-road parking so forecourt charging will be the only option.

[John Stumbles]

Come on Steve, the efficiency is useful-power / total-power

so if the numerator and denominator are both zero that works out at 1 (100% efficiency) though the fact that the denominator is zero tells you it's a pretty meaningless result.

So really you're both right: Dr D is correct in the 100% bit, and it's a load of bollocks which we all expect from him anyway :-)

Still it seems a valid point that in congested traffic an electric vehicle will generally be vastly more efficient than anything which has to keep an engine running (which needn't mean all IC engined vehicles, but in practice ATM it does). I think this has been the accepted wisdom since the earliest days of the electric milk float.

[Doctor Drivel]

It's 100% efficient when stopped at the lights. The maths check out too. Boy are people from grotty towns dumb!

The shitkickers can only relate to tractors.

[Doctor Drivel]

No change there then.

[Dave Plowman (News)]

The purpose of a vehicle is to move, so cannot be anything other than 0% efficient at standstill.

But to put it on your planet where boilers are 110% efficient, how efficient is a boiler when switched off? 210% efficient by your reckoning?

The whole world is wrong. Only you are right. So try joining this world.

[Dave Plowman (News)]

Boy you're thick.

What maths? Efficiency is work done against energy used. If no work is done...

Yup - and they don't come grottier than MK. But I suppose it's the best you can afford.

[Doctor Drivel]

Look at this, he is trying to think. Sad isn't it, as it comes out all wrong.

Look what thinking did for him..

Look what Viessmann say: "Boilers which exploit condensing technology achieve a standard efficiency of up to 109 % by gaining additional energy from flue gases (natural gas)"

Sad isn't it. Very sad. I blame Thatcher.