R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Thread Tools Search this Thread
Old 07-24-2006, 07:35 AM   #1
Tech Adept
Join Date: Oct 2005
Location: I don't know
Posts: 201
Default Calculating milliamps

How do I calculate the milliamps left in a pack after a race? I'm using a Deans cutoff box and a 30A light bar.
rockdog200 is offline   Reply With Quote
Old 07-24-2006, 07:43 AM   #2
Tech Elite
sosidge's Avatar
Join Date: Dec 2001
Location: Bristol, UK
Posts: 3,865

Basically impossible with such a simple setup. As the lights dim their current draw decreases, so the calculation is about much more than time.

Is milliamps left so important anyway? As long as the car is fast and you make the end of the race, it doesn't really matter. I don't think anyone dumps with 4200's.
sosidge is offline   Reply With Quote
Old 07-24-2006, 07:55 AM   #3
Tech Elite
seaball's Avatar
R/C Tech Charter Subscriber
Join Date: Sep 2001
Posts: 4,303
Trader Rating: 9 (100%+)
Send a message via Yahoo to seaball

for arguments sake, if you had a constant current discharge, your equation should look like this:

mAH = (t/3600)*i*1000


t = discharge time in seconds
i = discharge current in amps

eg: at a 30 amp discharge, 100 seconds of runtime = 833 mAH.

alot of racers just go by seconds left in the pack. the above calculation takes into account different discharge rates, so that regardless of what discharger you are using, you can compare your cells to someone elses on theirs.
*** The Gate II - Home of Mike Wise ***
seaball is offline   Reply With Quote
Old 07-24-2006, 09:25 AM   #4
Tech Master
1fastdude's Avatar
Join Date: Apr 2002
Location: Sinsinnati
Posts: 1,938
Trader Rating: 15 (100%+)

seaball........................................... ...........my hero.

-Jacques Costeau-
★RCAmerica •Xray •Hudy •BSR/Jaco •Absolute Hobbyz •Gravity RC •PROTOform •Avid •TQ Racing Wire •C & M Motorsports ★
1fastdude is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
calculating FDR and rollout Blisster Electric On-Road 29 08-20-2007 03:29 AM
Calculating roll out jnor R/C Tech Site Forum 5 04-10-2007 02:46 PM
calculating stuff fritzD Electric On-Road 3 09-11-2005 03:18 PM
Milliamps? HVAC25000 Electric On-Road 7 02-02-2005 12:20 AM
Calculating Speed jigga21 Electric On-Road 11 12-29-2004 10:24 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off

All times are GMT -7. It is currently 11:43 AM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net