Electric vehicles miles per KWh

almillar

silverwhistle - yes, they did, in an attempt to make a point in response to someone saying that solar is free.

EricMears

almillar wrote: »

Ah, you're a coaster. Yes, with all this one pedal driving stuff, I'd like a notch, or a big spot where you could use zero energy, but it's difficult to do, so I just knock the car into neutral a lot. This guarantees that you're neither pumping energy in, nor slowing the car down unnecessarily.

Afraid driving along in neutral might be regarded as not having proper control of the car ! But even if not actually illegal it's really not a great idea - getting back into gear from neutral isn't always simple and you might find you need to do so quickly.

AFAIK, it's only Nissan who have the crazy policy of forced recuperative braking. VW for certain, along with everyone else I've asked about it, let you select whether or not it's appropriate and at what level you want to select.

Martyn1981

almillar wrote: »

silverwhistle - yes, they did, in an attempt to make a point in response to someone saying that solar is free.

Hi. It was not said that solar was free, it was said that the fuel for wind and solar is free and delivered to site.

GA argued that IF you ignored the cost of exploration, extraction and transportation, then gas is also free at the power station. :think:

Martyn1981 wrote: »

GreatApe wrote: »

Fossil fuels are 'free'

They are just there
Once you build a gas rig you just have to do a little bit of maintenance

In the same way sunshine is just there
Once you build sun rig (PV system) you just have to do a little bit of maintenance

Free gas Energy or free sun energy both are 'free'

The gas you can use to heat your home or run it through a gas power station
Even the gas power station once you build the power rig you just have to do a little bit of maintenance so that's 'free' too


I'm not thick enough to think any of this is 'free' but your comrade is trying to claim solar is 'free it's just the catching it that costs money'....... By they definition more or less everything is 'free'

You seem a little confused.

The PV system provides energy, from free fuel. The oil rig (not free) is used to extract crude oil, not produce energy.

Once again - RE powerstations use free fuel, whilst FF powerstations have to buy fuel, fuel which itself has already consumed vast amounts of energy and money to get there.

And again, for further clarity, an oil rig is part of the non-free FF supply chain. Whereas the fuel supply chain for RE is .... well ...... free.

1961Nick

EricMears wrote: »

Afraid driving along in neutral might be regarded as not having proper control of the car ! But even if not actually illegal it's really not a great idea.......

Coasting seems to be accepted these day. Both of our cars have a default coasting function - which I switch off because I prefer proper control of the car.

When my daughter was learning to drive, she was taught to dip the clutch & use the brakes to slow the vehicle down rather than using any engine braking.

EricMears

1961Nick wrote: »

Coasting seems to be accepted these day. Both of our cars have a default coasting function - which I switch off because I prefer proper control of the car.

I wouldn't describe driving along without braking or accelerating as 'coasting' ! Not sure what a 'coasting function' offers but for me it would need to have some quick way of cancellaion in an emergency.

1961Nick wrote: »

When my daughter was learning to drive, she was taught to dip the clutch & use the brakes to slow the vehicle down rather than using any engine braking.

Assuming she was taught in an IC engined car, her instructor was correct (though perhaps not about needing to declutch early in the process). Engine braking is usually presented as "saving wear on the brakes" but oh boy doesn't it increase wear on clutch linings ! A competent mechanic can probably change a complete set of brake linings in an hour or two; changing a clutch plate usually takes far longer.

Recuperative braking on an EV doesn't involve any mechanical wear at all so would always be the method of choice for normal braking. But using it when going uphill means that less than 50% of the energy is recovered and has to be replaced to regain speed; letting gravity & friction take care of slowing is far more economical.

joefizz

EricMears wrote: »

Recuperative braking on an EV doesn't involve any mechanical wear at all so would always be the method of choice for normal braking

Tesla advise you to periodically have the mechanical brakes checked in case they have seized, they are used that infrequently.

NigeWick

almillar wrote: »

someone saying that solar is free.

My solar IS now free as the system has paid for itself already.

As I write, it's putting 2.9 kW into the car after powering the house, heating the water and filling the Tesla PW2.

1961Nick

EricMears wrote: »

I wouldn't describe driving along without braking or accelerating as 'coasting' ! ......

What I was referring to was an automatic transmission declutching when you lift off.....so that the engine revs drop to idle (ZF HP8).

almillar

Afraid driving along in neutral might be regarded as not having proper control of the car !

Indeed. Rule 1 - don't do it. Rule 2 - know when it's OK to do it. EG approaching traffic lights, but NOT down a twisty hill.

getting back into gear from neutral isn't always simple and you might find you need to do so quickly.

Depending on the car it's perfectly simple. And I refer back to rules 1 and 2.

AFAIK, it's only Nissan who have the crazy policy of forced recuperative braking

They've all got it, and various ways of doing it. Any I've driven will regenerate a certain amount, by default, when you completely release the throttle. A Leaf, and Soul EV, has 2 modes, D and B, with B being more aggressive with the regen. A Zoe only has 'D'. On all these cars, you need a very fine foot to find '0kWh' (no power in, no power out). An i3 has very aggressive regen, with different modes, and will bring you to a halt with no throttle. Mitsibushi Outlander and Hyundai Ioniq have paddles to adjust how aggressive the regen is - I've driven an Outlander and the least aggressive just drives like an automatic.

Not sure what a 'coasting function' offers but for me it would need to have some quick way of cancellaion in an emergency.

'Coasting function' is an automatic car (or automated manual) that will emulate you putting your clutch pedal down, and coast. My wife's DSG gearbox has it, and if you're in Efficiency mode, and take the throttle off, it engages and the car coasts. It re-engages quickly and works pretty well, to be honest.

But using it when going uphill means that less than 50% of the energy is recovered and has to be replaced to regain speed; letting gravity & friction take care of slowing is far more economical.

Why would you regen (slow down on purpose) going up a hill? This is all just good, economical driving, in any car, with the bonus of regen in an EV. You won't get far up a hill coasting either, you need to put some energy in!

EricMears

almillar wrote: »

Why would you regen (slow down on purpose) going up a hill? This is all just good, economical driving, in any car, with the bonus of regen in an EV. You won't get far up a hill coasting either, you need to put some energy in!

I'd like to be able to stop accelerating and rely on gravity to kill speed when traffic lights at top of hill are showing red. Nissan decree that as soon as I stop accelerating the car will start RB.

If you let the car 'run away' without accelerating it will gain enough momentum to carry it at least some of the way before you need to start accelerating again. Nissan insist on slowing it down on the way down hence requiring more acceleration sooner to go up again.

My previous car was a VW e-Up!. On that, you could choose between no RB at all, 3 different levels of it or a really severe form ('B'). Or of course if you put foot on footbrake other than extremely hard, braking would also use the 'B' setting of RB. I was assured yesterday that the e-Golf behaves exactly the same and several weeks ago that Kia adopt same rules in their EVs.