Go Back   EcoModder Forum > EcoModding > Fossil Fuel Free
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 10-30-2010, 10:15 AM   #41 (permalink)
Master EcoModder
 
roflwaffle's Avatar
 
Join Date: Dec 2007
Location: Southern California
Posts: 1,490

Camryaro - '92 Toyota Camry LE V6
90 day: 31.12 mpg (US)

Red - '00 Honda Insight

Prius - '05 Toyota Prius

3 - '18 Tesla Model 3
90 day: 152.47 mpg (US)
Thanks: 349
Thanked 120 Times in 79 Posts
Quote:
Originally Posted by Old Mechanic View Post
Uh, it has a 5 speed transmission, and the original engine was 100 kg. The transmission automatically freewheels when you let off the accelerator so P&G is easy, but it is also illegal in many places in the US.
Coasting in neutral can be illegal, but what states prohibit freewheeling transmissions?

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 10-30-2010, 11:24 AM   #42 (permalink)
Left Lane Ecodriver
 
RobertSmalls's Avatar
 
Join Date: Aug 2008
Location: Buffalo, NY, USA
Posts: 2,257

Prius C - '12 Toyota Prius C
Thanks: 79
Thanked 284 Times in 197 Posts
Coasting in neutral may be illegal, but some Honda and Toyota hybrids leave the factory programmed to do so. It's not an issue.

Crash tests are run at a few hundred lbs above curb weight, and cars become less safe as you add more, but they're not going to instantly disintegrate in a crash above GVWR. Stock brakes and handling can be assumed to be safe only up to the car's GVWR. It's a problem for low-budget EV conversions, but not so much for commercial BEV's like the Leaf.

This article shouldn't have lead with 375mi@55mph. That's a record I could break with $30k. They should have lead with "three times the energy density of LiFePO4's". That's amazing, and if they can work out the kinks (cost!), then it'll make future EV's more viable.

Also, I still want to know:

2500 cycles to what percent capacity? And don't say 100%, that's BS. What charge and discharge rate are required to achieve that figure?

And isn't LMP one of those chemistries that is capable of thermal runaway?
  Reply With Quote
Old 10-30-2010, 12:59 PM   #43 (permalink)
Master EcoModder
 
roflwaffle's Avatar
 
Join Date: Dec 2007
Location: Southern California
Posts: 1,490

Camryaro - '92 Toyota Camry LE V6
90 day: 31.12 mpg (US)

Red - '00 Honda Insight

Prius - '05 Toyota Prius

3 - '18 Tesla Model 3
90 day: 152.47 mpg (US)
Thanks: 349
Thanked 120 Times in 79 Posts
Aren't most most Li chemistries capable of thermal runaway? In terms of lifespan the A2 still had ~20% of the initial charge left on the 350+ mile run, so I imagine the lifecycle figure refers to the number of cycles to 80% capacity.

Quote:
Originally Posted by NeilBlanchard
They are also saying the batter is 97% efficient, which a bit better than current batteries (which are ~94% as I understand it?).
Aren't most Li batteries are in the high nineties in terms of efficiency? The only exceptions I can think of are cells w/ higher internal resistance and even then that's only at higher discharge rates.

Quote:
Originally Posted by Old Mechanic View Post
50k@2500 cycles (battery cost-depreciation).
$20 per full cycle (every 375 miles under perfect conditions).
not including the electricity cost.
18.75 cents per mile in battery depreciation.
say 25 cents a mile in electricity and battery depreciation (at least).
they have a very long way to go.

regards
Mech
The lifecycle was supposedly ~300k miles, not 50k miles. Where are you getting the cost of the batteries from?
  Reply With Quote
Old 10-30-2010, 01:21 PM   #44 (permalink)
Master EcoModder
 
Join Date: Jun 2008
Location: Earth
Posts: 5,209
Thanks: 225
Thanked 808 Times in 592 Posts
Quote:
Originally Posted by Tweety View Post
So yeah, to keep the weight limits you have to either pack light (10 Kg for four people) or choose passengers or cargo...
And this is a problem how, exactly? I can't even remember the last time I had another human in the car with me (and the dog's only about 60 lbs), most of the cars I see on the roads have just one or two passengers...

If you need to carry more, buy a minivan.
  Reply With Quote
Old 11-01-2010, 09:27 AM   #45 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,891

Mica Blue - '05 Scion xA RS 2.0
Team Toyota
90 day: 42.48 mpg (US)

Forest - '15 Nissan Leaf S
Team Nissan
90 day: 156.46 mpg (US)

Number 7 - '15 VW e-Golf SEL
TEAM VW AUDI Group
90 day: 155.81 mpg (US)
Thanks: 3,423
Thanked 2,914 Times in 1,827 Posts
Best article on this with the most information and nuanced discussion, so far:

Claiming Battery Breakthrough, Electric Audi Drives 375 Miles at 55 MPH Without Recharging | PluginCars.com
__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
  Reply With Quote
The Following User Says Thank You to NeilBlanchard For This Useful Post:
RobertSmalls (11-01-2010)
Old 11-01-2010, 07:52 PM   #46 (permalink)
home of the odd vehicles
 
rmay635703's Avatar
 
Join Date: Jun 2008
Location: Somewhere in WI
Posts: 3,554

Silver - '10 Chevy Cobalt XFE
Thanks: 407
Thanked 760 Times in 570 Posts
Quote:
Originally Posted by roflwaffle View Post
Coasting in neutral can be illegal, but what states prohibit freewheeling transmissions?
How do I drive a MT car in these states? It isn't possible for me to stop without the transmission being in neutral and clutch in is no different than neutral, I just damage the throw out bearing faster.
  Reply With Quote
Old 11-02-2010, 02:43 PM   #47 (permalink)
Master EcoModder
 
roflwaffle's Avatar
 
Join Date: Dec 2007
Location: Southern California
Posts: 1,490

Camryaro - '92 Toyota Camry LE V6
90 day: 31.12 mpg (US)

Red - '00 Honda Insight

Prius - '05 Toyota Prius

3 - '18 Tesla Model 3
90 day: 152.47 mpg (US)
Thanks: 349
Thanked 120 Times in 79 Posts
It's a regulation that was meant for large trucks back in the day, and practically speaking it refers to coasting in N at higher speeds, and even then it's pretty much impossible to regulate, but if you tell a cop that you were doing it they might ticket you.
  Reply With Quote
Old 11-13-2010, 02:24 AM   #48 (permalink)
EcoModding Apprentice
 
Join Date: Nov 2010
Location: Annapolis
Posts: 159
Thanks: 0
Thanked 29 Times in 24 Posts
Quote:
Originally Posted by RobertSmalls View Post
They should have lead with "three times the energy density of LiFePO4's". That's amazing, and if they can work out the kinks (cost!), then it'll make future EV's more viable.
Three times the energy density is more than amazing, it's incredible. There are limits with the difference in energy states for the battery chemistry that makes this... unlikely.

To do 3x by volume or weight, you need to switch to a fundamentally different energy storage approach e.g. ultracapacitors or an oxidizing battery.
  Reply With Quote
Old 11-18-2010, 07:36 AM   #49 (permalink)
All About EVs
 
Join Date: Jan 2008
Location: Seattle
Posts: 17
Thanks: 1
Thanked 1 Time in 1 Post
The 6 minute time for such a huge pack does sound VERY fishy indeed. The largest real rapid charger that I can think of off the top of my head is Aerovironment makes a 250kW model.
__________________
HPEV = High Performance Electric Vehicle
  Reply With Quote
Old 01-08-2011, 01:05 PM   #50 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,891

Mica Blue - '05 Scion xA RS 2.0
Team Toyota
90 day: 42.48 mpg (US)

Forest - '15 Nissan Leaf S
Team Nissan
90 day: 156.46 mpg (US)

Number 7 - '15 VW e-Golf SEL
TEAM VW AUDI Group
90 day: 155.81 mpg (US)
Thanks: 3,423
Thanked 2,914 Times in 1,827 Posts
more details on DBM Energy "Hummingbird" battery

This is a translated link of an article on Mirko Hannemann the inverntor, and the DBM Energy "Hummingbird" battery:

Power Pack With Great Perseverance

Awesome stuff!

__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com