Electric cars and the grid..... it has begun.

[m_c]

Standard insulated tools that you shouldn’t need unless you’re inside the hv drive battery removing cells.
You isolate the battery before working on motive system just like any other electric system

As somebody who is trained to work on EVs, insulated tools are stipulated for any work on the HV side.

For normal repairs, you don't actually isolate the battery, you simply remove the isolating plug, which is akin to just breaking the circuit.
In theory, the circuit should never remake, and you should check there is no voltage before carrying out any work, but there is always that miniscule chance something could short out (it would actually take several failures) and energise the system enough to cause you problems should you connect yourself to something live.

The big problem with DC is you stick to it, which is why garages are also required to have an insulated recovery pole/hook, should the worst happen.
At least AC will throw you away, and not stop your heart dead.

 

[pressbrake1]

A isolating plug is isolating the battery!
Unfortunately AC doesn’t push you away and you can get s nasty cardiac arrhythmia. I’ve found that out personally
Dc is a **Language**er because as you said it holds muscle in contraction including your heart
Naturally you’d use insulated tools near hv like any spark would as precaution.
Tesla and Edison got into a disagreement over which was safer , DC or AC
Ac is definitely safer when switching under load

 

[PhillipM]

But then it wouldn't be a Caterham . . .

It might ride bumps just the same as it does now though - very well, with no leaping into the air, no deviations from chosen direction. Its got the right shocks, springs, wheels, tyres for a lightweight car.

And now that extra 400kg has to be controlled over dips, crests etc - so no, I don't agree.

There's nothing to agree with it's physics, the unsprung weight reacts against the sprung weight. That's what needs controlling.
But of course there's all those famously bad riding cars that are really heavy like Rolls Royce, Bentleys, Maybachs....right?

 

[minimutly]

A isolating plug is isolating the battery!
Unfortunately AC doesn’t push you away and you can get s nasty cardiac arrhythmia. I’ve found that out personally
Dc is a **Language**er because as you said it holds muscle in contraction including your heart
Naturally you’d use insulated tools near hv like any spark would as precaution.
Tesla and Edison got into a disagreement over which was safer , DC or AC
Ac is definitely safer when switching under load

If they'd had that argument now, Dc would likely have won - no transformers needed, just a pile of inverters, no worries about grid frequency, issues with power factor losses, mains hum.

 

[eLuSiVeMiTe]

If they'd had that argument now, Dc would likely have won - no transformers needed, just a pile of inverters, no worries about grid frequency, issues with power factor losses, mains hum.

Most electrical gear in my house seems to be DC with its own transformer anyway.

Still trying to find a mains hum on my mixing console. Drives me nuts.

 

[minimutly]

Most electrical gear in my house seems to be DC with its own transformer anyway.

Still trying to find a mains hum on my mixing console. Drives me nuts.

I have one my guitar amp picks up - its in the house somewhere - comes on and goes off.

 

[fizzy]

Wrong
Coefficient of friction over force
My Iveco has 225 tyres and it stops fine
My old 7.5 tonner had 750/16 like a landrover but stopped better

Hammond crashed because you need elite level skills to wring the neck of 1000hp
My old 150 hp Capri would make you look silly because there wasn’t enough weight over the back

Are you saying 185 tyres on the back end of a 911 would give the same grip as 275s?

 

[daleyd]

Are you saying 185 tyres on the back end of a 911 would give the same grip as 275s?

I have no idea of the point of this and I’m struggling to think why tyres was even brought up as an “issue”, other than another thing with which to beat up over EV cars?

Ours stops, goes and corners exactly like any other car I’ve owned, even with supposedly “eco” tyres and the extra weight. It certainly stops better than some small cars I’ve driven with non “eco” tyres and petrol/Diesel engines - I’m thinking particularly of some small hire/rental cars I’ve had (usually bargain basement spec Clio or similar) which would kick in the abs at the drop of a hat. Again it’s just an absolute non issue in day to day driving, ask anyone who’s driven one, or maybe even try one yourself

 

[GRW]

I tend to think the trend to fat tyres is largely cosmetic myself - making road cars look more "purposeful" & "sporty" to increase their appeal.

For normal Road use - narrower tyres give perfectly adequate grip, and having taller sidewalls helps the ride quality (& stops kerbing wheel rims). Yes if pushed they'll understeer more - but we aren't meant to be doing that, right

I've had a few more modern vehicles to drive for work, and even the utilitarian stuff like Renault Kangoo Diddy vans have pretty wide tyres - and living in wet Wales, I can tell you that the damned things aquaplane very easily, ad generally aren't great for grip in the wet. The tyres aren't hard-wearing either - they don't last long.

The vehicle would be better, and probably do a bit more mpg, with narrower tyres for sure IMO.
It's one more fashion over function.

 

[mtt.tr]

Wow this thread is, erm, getting desperate

 

[pressbrake1]

Are you saying 185 tyres on the back end of a 911 would give the same grip as 275s?

If it wasn’t for rubber failure then yes
Gp cars only started to get wide tyres once there was aerodynamic downforce
If a f1 car isn’t going fast enough for aerodynamics to be working it has no grip because the tyres are so wide

 

[pressbrake1]

If they'd had that argument now, Dc would likely have won - no transformers needed, just a pile of inverters, no worries about grid frequency, issues with power factor losses, mains hum.

I think there are some ultra high voltage dc transmission lines in Europe?
Shouldn’t think it would be the most reliable grid
I certainly wouldn’t want hv dc in my house!

 

[mtt.tr]

I think there are some ultra high voltage dc transmission lines in Europe?
Shouldn’t think it would be the most reliable grid
I certainly wouldn’t want hv dc in my house!

Ehdv is very very efficient less losses

 

[weldingnovice]

Cars Now Release More Pollution From Their Tires Than Their Tailpipes, Analysis Shows - EcoWatch

The particulate pollution from car tires is nearly 2,000 times worse than that from vehicle exhaust pipes.

www.ecowatch.com

Ev are proportionaly heavier so more tyre wear

All sides of the eco argument rubbish each other's research

Ev will suit some peoples commute requirements and some not so much

Personally I think it's designed to forment dispute and is proving to be quite effective

 

[pressbrake1]

Ehdv is very very efficient less losses

Yes less inductive losses

 

[m_c]

This thread does make me think of this

 

[selectedgrub]

Wow this thread is, erm, getting desperate

Wait til you see the awesome guitar solo (just a tad under 3hours long) from the electric camel toes.

 

[fizzy]

If it wasn’t for rubber failure then yes
Gp cars only started to get wide tyres once there was aerodynamic downforce
If a f1 car isn’t going fast enough for aerodynamics to be working it has no grip because the tyres are so wide

Why do F1 cars - and all other racing and sports cars have bigger tyres at the rear then?
Remember when a car accelerates the weight transfer is to the rear - hence wider tyres at the back to provide more traction under acceleration.
Also when people are going for more economy they over inflate their tyres - which makes the contact area smaller - hence less friction and better economy.
And yet most people on here still say wider tyres don't offer more grip? Not logical.

 

[mtt.tr]

Yes less inductive losses

And no skin effect

 

[mtt.tr]

This thread does make me think of this
View attachment 357504

The Simpsons is one of my few joys, I never make home to watch though.