Go to Post By the way, I will be running for office in 2008 .... - Paul Copioli [more]
Home
Go Back   Chief Delphi > Technical > Electrical
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Reply
Thread Tools Rate Thread Display Modes
  #16   Spotlight this post!  
Unread 05-28-2018, 01:38 AM
cbale2000's Avatar
cbale2000 cbale2000 is online now
Registered User
AKA: Chris Bale
FRC #5712 (Gray Matter)
Team Role: Mentor
 
Join Date: Apr 2006
Rookie Year: 2004
Location: Saginaw, MI
Posts: 1,572
cbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond reputecbale2000 has a reputation beyond repute
Re: 12 awg vs 10awg

Quote:
Originally Posted by Al Skierkiewicz View Post
Chris,
What device are you using to measure internal resistance?
Battery beak.
__________________
2005-2008: FRC 703 Phoenix - Robot Driver
2009-2016: FRC 703 Phoenix - Mentor
2017-????: FRC 5712 Gray Matter - Mentor
Reply With Quote
  #17   Spotlight this post!  
Unread 05-29-2018, 10:47 AM
Unsung FIRST Hero
Al Skierkiewicz Al Skierkiewicz is offline
Chief Robot Inspector
AKA: Big Al WFFA 2005
FRC #0111 (WildStang)
Team Role: Engineer
 
Join Date: Jun 2001
Rookie Year: 1996
Location: Wheeling, IL
Posts: 11,092
Al Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond reputeAl Skierkiewicz has a reputation beyond repute
Re: 12 awg vs 10awg

The battery beak makes a calculation based on measurements using two resistors as I remember. The difference between 0.011 and 0.015 is not big enough to make a serious decision on battery condition. Many teams use a West Mountain Radio CBAIV. We use this device and it can be set to conditions that manufacturers use to determine the condition of their batteries. This device produces a constant load based on current and then graphs the terminal voltage over time. I use 7.5 amps and 10.5 volts as the cutoff for the test. This will take the better part of two hours to run each test but you can then use the data to make a determination of the internal resistance by calculating resistance using the terminal voltage and current. The CBA does an actual amp hour rating and the 7.5 amps will closely match the standard set of curves for this battery type. Which is even more helpful is the ability to save tests for the same battery and overlay them with the current test.
__________________
Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
________________________
Knowledge is power. Power UP!
Reply With Quote
  #18   Spotlight this post!  
Unread 05-29-2018, 10:55 AM
ns3517's Avatar
ns3517 ns3517 is offline
Registered User
FRC #0316 (Lunatecs)
Team Role: Leadership
 
Join Date: Jul 2015
Rookie Year: 2008
Location: south jersey
Posts: 155
ns3517 has a spectacular aura aboutns3517 has a spectacular aura about
Re: 12 awg vs 10awg

Quote:
Originally Posted by JamesCH95 View Post
Bingo. We retire anything that tests over .021 or so.
What do you measure it with and whats the process behind it?
Reply With Quote
  #19   Spotlight this post!  
Unread 05-29-2018, 12:07 PM
JamesCH95's Avatar
JamesCH95 JamesCH95 is offline
Hardcore Dork
AKA: JCH
FRC #0095 (The Grasshoppers)
Team Role: Engineer
 
Join Date: Dec 2004
Rookie Year: 2001
Location: Enfield, NH
Posts: 2,560
JamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond reputeJamesCH95 has a reputation beyond repute
Re: 12 awg vs 10awg

Quote:
Originally Posted by ns3517 View Post
What do you measure it with and whats the process behind it?
Battery Beak. We have observed short run times and 'slow' performance to batteries that show this sort of internal resistance. For our usage it matches with the 'two year max' rule of thumb on competition batteries.

It's not super formal or scientific, but it's better than nothing.
__________________
Theory is a nice place, I'd like to go there one day, I hear everything works there.

Maturity is knowing you were an idiot, common sense is trying to not be an idiot, wisdom is knowing that you will still be an idiot.
Reply With Quote
Reply


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 02:24 PM.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi