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181

General Car Chat / Re: Oh...the penny has finally dropped

« on: 12 January 2023, 16:32:28 »

Maths was based on the following...

(square root of 3)1.73 x 32A x 240V = 13,286.4Wh or 13.29kWh

So to charge 93kW would take 7 hours.

22kWh would require a current of 53A which is somewhat optimistic for a domestic supply, even three phase.

Why root 3? The correction you're applying is already accounted for in the 240V RMS calculation of voltage.

Most normal houses only have single phase, and the supply is typically fused at 60A. Flats can be 30A, but if you're living in a flat on the 12th floor of Nelson Mandela house then charging an EV is going to be problematic anyway. You can ask for the 30A/60A to be upgraded to 80A or 100A on a single phase.

A 22Kw wall charger does require 3 phase. Again you can ask to be upgraded. I suspect the local distribution grid is going to struggle though if/when every house in a street wants it.

root 3 is used for 3 phase power calcs as you don't actually get '3' times the power when its a 3 phase machine in delta wiring (you can in star but then the voltage is lower), but the voltage is 400 not 230 

Yes, I know, that's why I said the root 3 bit is already taken into account in the 240V RMS. 400V / root(3) = 230.9V.

182

General Car Chat / Re: Oh...the penny has finally dropped

« on: 12 January 2023, 14:40:19 »

From here, granted we're not talking about a motor, but draw is draw.

The 32A was the suggested current for domestic 3 phase in the UK.

If greater is available, have at it, but the cost of charging at those rates isn't going to improve.

30A @ 240V is 7.2Kw. Would've thought that a bit low for a house - even a small one. Got a feeling that my home electric cooker is fused at 30A on it's own. Will have a look at the main fuse when I get home. We've got 3 phase 100A here at work - so potentially 72KW.

But you're right - if you want to charge a 100KWh battery from flat to full, then you're going to need 100KW of electrons*. The supply capacity only really affects how long it takes to get those electrons into the battery* - the cost will be similar (assuming you're not on some day/night tarrif).

* that's not how it works. There are the same number of electrons in a charged battery as there are in a discharged one. The charged ones just have a higher energy state. :-)

183

General Car Chat / Re: Oh...the penny has finally dropped

« on: 12 January 2023, 14:17:12 »

Maths was based on the following...

(square root of 3)1.73 x 32A x 240V = 13,286.4Wh or 13.29kWh

So to charge 93kW would take 7 hours.

22kWh would require a current of 53A which is somewhat optimistic for a domestic supply, even three phase.

Why root 3? The correction you're applying is already accounted for in the 240V RMS calculation of voltage.

Most normal houses only have single phase, and the supply is typically fused at 60A. Flats can be 30A, but if you're living in a flat on the 12th floor of Nelson Mandela house then charging an EV is going to be problematic anyway. You can ask for the 30A/60A to be upgraded to 80A or 100A on a single phase.

A 22Kw wall charger does require 3 phase. Again you can ask to be upgraded. I suspect the local distribution grid is going to struggle though if/when every house in a street wants it.

184

General Discussion Area / Re: White Goods Thread

« on: 10 January 2023, 13:11:41 »

Actually,, if you cook the defrosted meat, can you then refreeze it again?

Yes. And it's actually quite an efficient way to do batch cooking. Cook everything, divide it into (man sized) portions, and then re-freeze. I use those plastic curry trays/pots you get from the takeaway. Then when you want to eat something, defrost overnight in a fridge, and heat the next day in a microwave. 10 minutes in the microwave will use a lot less leccy than cooking a meal properly each day. Boil up some rice/pasta/spuds on the hob and jobs a goodun.

One thing often not mentioned in batch cooking reports is to make sure you label the portions as you put them in the freezer. If you don't then meals just become freezer lucky dip - you're never quite sure if tomorrows tea is going to be Liver and Onions in gravy, or Chicken Phal, or Spag Bog.

Only a woman would know the answer.

Hello honkytonk 

185

General Discussion Area / Re: Harold

« on: 09 January 2023, 13:10:05 »

Ahh, exploding caps was our favourite lunch time activity in the school science lab.

Tantalums are better - and far harder to put out the fire than when a normal electrolytic pops it's cork. And they leave a brown sludgy mess everywhere.

186

Omega General Help / Re: Lambda sensor issues

« on: 05 January 2023, 18:01:52 »

Ok - I'll revise to...

It is an Omega.

They have definitely been weakened before and are probably ready to snap

187

Omega General Help / Re: Lambda sensor issues

« on: 05 January 2023, 14:41:47 »

I would just do the sanity check first before replacing anything. 30 seems hot to me, but I don't know that engine type.

Leave the car overnight. Next morning plug in your scan tool, and BEFORE YOU START THE ENGINE watch the Coolant and IAT temperatures. If both are giving similar and sensible readings (I would guess circa 10 degC outside at the moment), start the car. Continue watching both. Coolant should rise to 80-90, and IAT may rise a little - depends how much effect the throttle body heating has. If the IAT stays at 30 all the time, then it's probably goosed.

I would not just go around replacing things willy-nilly, if for no other reason that 20 year old plastic connectors that have never previously been disturbed can and will break as you wrestle to get the wretched things apart. And then you will have to replace something, even if it wasn't broken in the first place.

188

Omega General Help / Re: Lambda sensor issues

« on: 05 January 2023, 10:18:29 »

Intake air temperature looks a bit warm/wrong - 30DegC at the moment?

Nah, engine is almost upto temp 82°C and the throttle body has coolant running through it.

Perhaps - I'm not familiar with that engine. Sanity check is to check the IAT is similar to CTS before starting the car after it's been left overnight. But AIUI the coolant in the throttle body is to stop it icing up in cold weather. With 2.6L of air passing through the throttle body 5 times a second (ish) unlikely the air is really being heated by 20 DegC. Always assuming this is being done outdoors in a well ventillated area.

The LC typically only shows 30 degC IAT whilst it's being ragged during a summers track day. If the IAT sensor reads warm, the ECU leans off the mixture (because warm air is less dense so contains less oxygen per litre). The Lambda sensors then notice the lean mixture and the ECU increases the fuel trims to restore stoic. So a duff IAT sensor can lead to apparent lambda sensor issues.

189

Omega General Help / Re: Lambda sensor issues

« on: 05 January 2023, 09:43:07 »

Intake air temperature looks a bit warm/wrong - 30DegC at the moment?

190

General Discussion Area / Re: What A Way To Go....

« on: 01 January 2023, 18:20:44 »

Even the most highly trained deck people make mistakes. This guy survived.

https://www.youtube.com/watch?v=XC1TCXyCqrg

I believe it also happened on the old Ark - or could've been HMS Eagle - when a sailor got sucked into a Buccaneer engine.

191

General Discussion Area / Re: Shoreham Air Show.

« on: 21 December 2022, 16:06:18 »

A coroners verdict has virtually no legal meaning. Regardless of what 'we' may all think, he was found not guilty of manslaughter, so there ain't much that can be done now. Of course the affected could bring civil cases, but it'll be the insurance companies that have to pay out (if anyone has to pay out). People cn go on forever trying to obtain 'justice' but there comes a point where it's pointless.

192

General Discussion Area / Re: Genuinely, the end of an era .

« on: 08 December 2022, 13:23:42 »

I've been to this one at Coventry airport

https://en-gb.facebook.com/Dcdiner15/

And one in Slovakia too, but that's now closed (fallen apart!).

193

General Discussion Area / Re: Genuinely, the end of an era .

« on: 08 December 2022, 12:31:03 »

We only have 13 of them (with no intention of purchasing any more) and are currently the second largest operator. Which gives you an idea of how cost effective they are.

12 :-) You can't purchase any more (new) because production ended in Dec 2021.

However, airlines are bringing them back into service much more quickly than anticipated post pandemic. More than half those ever built are back in service already, and that will probably be up past 75% by next summer. The problem being that airlines don't really know how long it'll take for B777X to be ready, so they've either got to re-commission stored A380's, join the queue for A350 or add used B777/A330 to their fleets. B787 isn't really and option because it's not large enough, and not popular with PAX either.

https://www.flightradar24.com/blog/the-status-of-the-airbus-a380-fleet-worldwide/

194

General Discussion Area / Re: Genuinely, the end of an era .

« on: 08 December 2022, 11:50:14 »

Flown on loads of 747s, upstairs also (premium economy on Air Chance is upstairs)

Best aircraft I have been on is the A380 from a passenger perspective, worst is still the 777 for me

I would agree that best is A380 - although I've only flown that with SQ. My personal worst was a B744 Air New Zealand, closely followed by a Qantas A330.

I've flown on lots of B747's from many airlines. The quality is more determined by the airline though. I would rather fly an old SQ B744 than on a new BA A380/350. Infact on my last trip back from Phoenix I had the choice of an AA B772, or a codeshare BA A350. Same price and similar times. The B772 every time for me, not because of the plane, but because of the operator. 

195

General Car Chat / Re: Winter Prep

« on: 08 December 2022, 10:16:07 »

Put the winter tyres on yesterday, and slung the snow chains in the boot. Off to an Alp this weekend, if we can evade all the strikes and power cuts here and in French France.