Go Back   EcoModder Forum > EcoModding > Success Stories
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 05-10-2017, 10:04 PM   #91 (permalink)
92 Civic VX since 2002
 
Magician's Avatar
 
Join Date: Dec 2016
Location: Bellevue, NE USA
Posts: 109

Green Bean - '92 Honda Civic VX
90 day: 54.9 mpg (US)
Thanks: 5
Thanked 11 Times in 10 Posts
yep... I read up on the lead acid batteries. If I roll start and avoid using the starter, I don't hardly use any of the capacity... The starter is an energy monster! Even having my LED headlights and LED running lights with the car running doesn't use all that much on a 10-20 minute drive. However, I figure it's best to leave my alternator switched on during any night driving or possibly on days that have very little sunlight.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 05-11-2017, 07:57 PM   #92 (permalink)
Master EcoModder
 
oldtamiyaphile's Avatar
 
Join Date: May 2009
Location: Australia
Posts: 1,080

UFI - '12 Fiat 500 Twinair
Team Turbocharged!
90 day: 49.6 mpg (US)

Jeep - '05 Jeep Wrangler Renegade
90 day: 18.09 mpg (US)

R32 - '89 Nissan Skyline

STiG - '16 Renault Trafic 140dCi Energy
90 day: 32.17 mpg (US)

Prius - '05 Toyota Prius
Team Toyota
90 day: 50.25 mpg (US)

Premodded - '49 Ford Freighter
90 day: 13.48 mpg (US)

F-117 - '10 Proton Arena GLSi
Pickups
Mitsubishi
90 day: 39.69 mpg (US)
Thanks: 229
Thanked 238 Times in 181 Posts
Quote:
Originally Posted by Magician View Post
yep... I read up on the lead acid batteries. If I roll start and avoid using the starter, I don't hardly use any of the capacity... The starter is an energy monster! Even having my LED headlights and LED running lights with the car running doesn't use all that much on a 10-20 minute drive. However, I figure it's best to leave my alternator switched on during any night driving or possibly on days that have very little sunlight.
Do the maths.

Worst case the starter draws 80A (peak- it drops rapidly once the engine is spinning). A small car battery has about 80Ah of capacity.

It takes 1 second to start a warm engine, occasionally longer, occasionally shorter.

Let's say you want to use only 20% of the batteries capacity, that's 16Ah.

80/3600=0.023

So it takes 0.023Ah to start your engine, 16Ah is enough for 700 starts!

In the real world I was able to start a Suzuki four times on a 90mah supercap, which would tend to confim my maths.
__________________






  Reply With Quote
Old 05-11-2017, 10:43 PM   #93 (permalink)
92 Civic VX since 2002
 
Magician's Avatar
 
Join Date: Dec 2016
Location: Bellevue, NE USA
Posts: 109

Green Bean - '92 Honda Civic VX
90 day: 54.9 mpg (US)
Thanks: 5
Thanked 11 Times in 10 Posts
If you've ever tried to start a car that doesn't want to run... the battery certainly won't last for any where near that many starts... I understand they usually start up fairly quickly, but that isn't a realistic number of starts on a fully charged battery. I am willing to bet even a brand new battery wouldn't do 250 starts without the alternator charging the battery at least a little bit.

BTW, on the sunny days... my solar panel is topping off my battery fairly easily as long as I don't use the starter but a few times in a day.
  Reply With Quote
Old 05-12-2017, 06:46 AM   #94 (permalink)
EcoModding Apprentice
 
Jack-Lee's Avatar
 
Join Date: Jun 2013
Location: Germany
Posts: 100

Partygurke - '90 VW Polo 2F
TEAM VW AUDI Group
Thanks: 1
Thanked 37 Times in 24 Posts
Peukert effect!

I could start my engine with my little 8Ah LiFePO4 about 40-50 times (need 160A to do that for about a second). After that, the internal resistence is too high to start.
  Reply With Quote
Old 05-15-2017, 10:46 PM   #95 (permalink)
92 Civic VX since 2002
 
Magician's Avatar
 
Join Date: Dec 2016
Location: Bellevue, NE USA
Posts: 109

Green Bean - '92 Honda Civic VX
90 day: 54.9 mpg (US)
Thanks: 5
Thanked 11 Times in 10 Posts
My MPGuino was off by about 5%, but I adjusted the Microsec/gallon setting by 5% and it seems to have self corrected my current tank. I read up on how to do this and finally tried it. Worked like a charm. Now my MPG's should be almost exactly matched to my MPGuino... over 99% accurate.
  Reply With Quote
Old 05-16-2017, 10:14 AM   #96 (permalink)
Super Focus'd
 
Join Date: Apr 2009
Location: Ozark, Missouri
Posts: 193

White Lightning - '05 FORD FOCUS SE ZX4
Team Ford
90 day: 35.21 mpg (US)

Rental Car - '16 NISSAN VERSA SV
90 day: 41.74 mpg (US)

Wife's Speedy - '06 Mercury Mariner Premier V6
90 day: 22.44 mpg (US)
Thanks: 37
Thanked 43 Times in 36 Posts
Great!!

__________________





Staying Focus'd on MPG
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com