Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


View this topic in a long page with up to 500 replies per page Create new topic
1 | ... | 498 | 499 | 500 | 501 | 502 | 503 | 504 | 505 | 506 | 507 | 508 | ... | 655
kingdragonfly
9168 posts

Uber Geek

Subscriber

  #2940665 11-Jul-2022 11:53
Send private message quote this post

wellygary: Something like 


"But its OK for Warren Buffett to profit from owning around 8% of BYD ??" 



If you're going to play the "evil capitalist" card, you might want to do better than Warren Buffet. He has promised to donate over 99% of his wealth.

Perhaps Elon would be a better example, with his union busting and pushing his employee toward Karoshi

Reuters: Warren Buffett donates $4 billion to charity

...Since 2006, the 91-year-old Buffett has donated more than half of his Berkshire shares, with the donations worth about $45.5 billion at the time they were made....

 
 
 

You will find anything you want at MightyApe (affiliate link).
wellygary
7507 posts

Uber Geek


  #2940731 11-Jul-2022 15:15
Send private message quote this post

kingdragonfly:
wellygary: Something like 

 

"But its OK for Warren Buffett to profit from owning around 8% of BYD ??" 

 



If you're going to play the "evil capitalist" card, you might want to do better than Warren Buffet. He has promised to donate over 99% of his wealth.

 

No it wasn't in respect to Mt Buffet being an evil capitalist, - but highlighting the inconsistences of US government restrictions regarding BYD 

 

it was a response to comments to the OP raising US criticism of BYD's practices and why they would never be allowed to be sold in the US,

 

My comment was a way of saying

 

"So its OK for the US to ban US consumers to purchase BYD because of their business practices, but its OK for US investors  Buffett was the specific, but it was a reference to US investors in general being allowed to invest and make profit from the company....


Batman
Mad Scientist
29121 posts

Uber Geek

Trusted
Lifetime subscriber

  #2940851 11-Jul-2022 22:57
Send private message quote this post

just thought of a way to increase efficiency of EV -

 

why don't they have another gear that kicks in at say 70km/h (or 80, 90), then when you cruise at 100kph the electric motor is at its most efficient

 

if you see here the only cars that exceed their EPA range when cruising on the highway at 75 mph (i think that's what it says)

 

is the only 2 cars with a second gear that kicks in at high speed

 

Taycan, eTron

 

https://www.caranddriver.com/shopping-advice/a32603216/ev-range-explained/

 

is it that hard to have a second gear?

 

* i wouldn't believe every number is directly comparable with another eg how is a model Y better than model 3 - must be different conditions like wind, temperature, hills etc but just a general trend

 

* also wondering if someone like Bjorn Nyland can confirm these seemingly magical numbers

 




Batman
Mad Scientist
29121 posts

Uber Geek

Trusted
Lifetime subscriber

  #2940852 11-Jul-2022 23:04
Send private message quote this post

following that i now have a question that nobody seems to know the answer to

 

how to increase efficiency on climbing hills - 

 

have high power motor so it doesn't work so hard when climbing?

 

+ high regen abilities when descending


Batman
Mad Scientist
29121 posts

Uber Geek

Trusted
Lifetime subscriber

  #2940854 11-Jul-2022 23:10
Send private message quote this post

when shopping for an EV i don't give a toss about 0-100, WLTP, EPA, other than how efficient it cruises at 100kph on the plains of Canterbury

 

and how efficient it climbs the crazy hills of Otago in the winter


jonathan18
7087 posts

Uber Geek

ID Verified
Trusted

  #2940855 11-Jul-2022 23:12
Send private message quote this post

@batman has your device lost its shift key and other punctuation related keys

Linuxluver

5824 posts

Uber Geek

Trusted
Subscriber

  #2940856 11-Jul-2022 23:12
Send private message quote this post

Batman:

following that i now have a question that nobody seems to know the answer to


how to increase efficiency on climbing hills - 


have high power motor so it doesn't work so hard when climbing?


+ high regen abilities when descending



If you're not in a hurry, show down. One way to slow down is follow a truck up the hill.




_____________________________________________________________________

I've been on Geekzone over 16 years..... Time flies.... 




DS248
1678 posts

Uber Geek

Lifetime subscriber

  #2940857 11-Jul-2022 23:18
Send private message quote this post

The Audi e-tron GT and Porsche Taycan do have a 2-speed gearbox on the rear axle.  And possibly a few other makes/models?

 

But not generally justified/needed.  Added weight and complexity generally out weight any (small) benefit.

 

 

 

Edit: Oh, I see batman added to his post after I started this reply ...  and mentioned re the e-tron GT and Taycan 


Batman
Mad Scientist
29121 posts

Uber Geek

Trusted
Lifetime subscriber

  #2940864 12-Jul-2022 06:45
Send private message quote this post

Linuxluver:
Batman:

 

following that i now have a question that nobody seems to know the answer to

 

 

 

how to increase efficiency on climbing hills - 

 

 

 

have high power motor so it doesn't work so hard when climbing?

 

 

 

+ high regen abilities when descending

 



If you're not in a hurry, show down. One way to slow down is follow a truck up the hill.

 

no idea how that's relevant

 

my questions is - which consumes less kwh/km climbing an Otago hill at 70-90kph (i don't want to go up a hill at 40kph on the open road to get the most out of the battery - that will just make the trip unbearable for me and the trail of cars following behind. also drafting at 40kph isn't going to help much)

 

ok back to 70-90kph -

 

say Ioniq 5 150kW motor, not so aero, 2.5 tonnes fully loaded RWD

 

Telsa model Y (some people say 250kW motor - i seriously doubt the figure but for argument sake let's say it is) 250kW motor, better aero, 2.3 tonnes loaded

 

is there efficiency gains if the motor isn't working so hard ...

 

or is 150kw more than enough to haul 2.5 tonnes - at 70kph? 90kph?

 

i think it's a relevant question when all my cars cost me between $7000-$40,000 in my life and now you have to fork out $70,000-$120,000. it's a headache


Batman
Mad Scientist
29121 posts

Uber Geek

Trusted
Lifetime subscriber

  #2940865 12-Jul-2022 06:47
Send private message quote this post

DS248:

 

The Audi e-tron GT and Porsche Taycan do have a 2-speed gearbox on the rear axle.  And possibly a few other makes/models?

 

But not generally justified/needed.  Added weight and complexity generally out weight any (small) benefit.

 

 

from the charts it's not a "small" benefit!

 

compare Taycan vs Kona / Model 3

 

(if the chart is correct - the article does say Model 3 was tested in the cold, doesn't say anything about other cars)


SaltyNZ
7237 posts

Uber Geek

Trusted
2degrees
Lifetime subscriber

  #2940905 12-Jul-2022 09:13
Send private message quote this post

As a general rule, under all conditions, slower is more efficient. Drag is proportional to the cube of velocity; power is (sort of, it isn't a straight line for a real motor) proportional to current. If you want to double your speed you will need ~8x the power, so ~8x the current. But resistive loss in the power train is proportional to the square of the current so at double the speed you waste on the order of 64x as much energy due to resistance, directly impacting your range. EDIT: of course I forgot to add that you get there in half the time, so the total loss is "only" 32x as much.

 

Gears don't really change it that much with an electric motor which has a much wider range of speed where power is approximately linear. So as others have said - that's why most EVs don't have a multi-speed transmission. The benefits just don't outweigh the extra complexity and weight. Combustion engines require complex transmissions because of their narrow speed range.

 

In any case ... if you try driving at 75mph in NZ, it won't be the range of the car that crimps your style.





iPad Pro 11" + iPhone 15 Pro Max + 2degrees 4tw!

 

These comments are my own and do not represent the opinions of 2degrees.


mkissin
313 posts

Ultimate Geek

ID Verified

  #2940914 12-Jul-2022 09:48
Send private message quote this post

Batman:

 

Linuxluver:

If you're not in a hurry, show down. One way to slow down is follow a truck up the hill.

 

no idea how that's relevant

 

 

It's the only thing that's relevant. You're attempting to beat physics. 

 

Going up a hill will require you to spend energy to gain gravitational potential energy, and to beat the friction/drag force from your tyres and aerodynamics.

 

Nothing you can do about the hill itself, so the only way to use less energy is to minimise that drag/friction, by slowing down (as Salty has pointed out).

 

Different cars will have different CdA products which helps with the drag, better tyres will help drop your rolling resistance, and having a bigger drive train will reduce losses that result from the high power draw, but they all pale in comparison to just driving slower. By orders of magnitude.


Batman
Mad Scientist
29121 posts

Uber Geek

Trusted
Lifetime subscriber

  #2941112 12-Jul-2022 12:52
Send private message quote this post

ok so more kw/hp motor doesn't help. cheers

 

one day i'm going to compare the EV6 RWD and the Model Y RWD and do the hills at different speeds and see what happens ...


mkissin
313 posts

Ultimate Geek

ID Verified

  #2941114 12-Jul-2022 13:00
Send private message quote this post

Batman:

 

ok so more kw/hp motor doesn't help. cheers

 

one day i'm going to compare the EV6 RWD and the Model Y RWD and do the hills at different speeds and see what happens ...

 

 

That would be super interesting if you were able to collect useful data, so I hope you do!

 

Interpret the data would require you having the CdA for each car, which manufacturers almost never give out. This is different to the just the Cd (drag coefficient) number, which they do often spout in marketing material, but which is largely meaningless without the A bit (the frontal area).

 

You'd also want the rolling resistance of the tyres, and so on and so forth. Basically, you need a wind tunnel and a dyno.


jonathan18
7087 posts

Uber Geek

ID Verified
Trusted

  #2941116 12-Jul-2022 13:07
Send private message quote this post

Apologies if already posted, but I found this short video of Rory Reid’s on the downsides of EV battery swapping interesting viewing.

A few weeks back I watched a fairly fawning video of another UK YT car person visiting the Neo battery swapping station in Norway, who seemed quite taken with the idea - Reid’s critique of the approach seems far more realistic.


1 | ... | 498 | 499 | 500 | 501 | 502 | 503 | 504 | 505 | 506 | 507 | 508 | ... | 655
View this topic in a long page with up to 500 replies per page Create new topic





News and reviews »

HP Unveils Broadest Consumer Portfolio of AI-Enhanced Laptops
Posted 3-Mar-2024 18:09


Samsung Tab S9 FE Review
Posted 3-Mar-2024 18:00


Norton Genie Review
Posted 3-Mar-2024 17:57


Synology Introduces BeeStation
Posted 23-Feb-2024 14:14


New One UI 6.1 Update Brings Galaxy AI to More Galaxy Devices
Posted 23-Feb-2024 10:50


Amazon Echo Hub Available in New Zealand
Posted 23-Feb-2024 10:40


InternetNZ Releases Internet Insights 2023
Posted 20-Feb-2024 10:31


Seagate Adds 24TB IronWolf Pro Hard Drives for Multi-user Commercial and Enterprise RAID Storage Solutions
Posted 19-Feb-2024 16:54


Seagate Skyhawk AI 24TB Elevates Edge Security Capacity and Performance
Posted 9-Feb-2024 17:18


GoPro Releases Quik Desktop App for macOS and Introduces Premium+ Subscription Tier
Posted 9-Feb-2024 17:14


Ring Introduces New Ring Battery Video Doorbell Pro
Posted 9-Feb-2024 16:51


Galaxy AI Transforms the new Galaxy S24 Series
Posted 18-Jan-2024 07:00


D-Link launches AI-Powered Aquila Pro M30 Wi-Fi 6 Mesh Systems
Posted 17-Jan-2024 20:02


Newest LG 4K Lifestyle Projector Doubles as Art Objet
Posted 9-Jan-2024 15:50


More LG Smart TV Owners Set To Enjoy the Latest webOS Upgrade
Posted 9-Jan-2024 15:45









Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.







Backblaze unlimited backup