How to convert between Amp-hours and Reserve Capacity - JeepForum.com

 
LinkBack Thread Tools
post #1 of 1 Old 01-02-2013, 10:48 PM Thread Starter
kjmccar
Registered User
2004 TJ Wrangler 
 
Join Date: Dec 2012
Location: Prescott
Posts: 285
How to convert between Amp-hours and Reserve Capacity

To cut to the chase: All you need to do to convert your battery's reserve capacity to Ah is multiply the reserve capacity by .417.

Here is the background
After I got a new battery for my jeep I was trying to find the Ah rating of the battery - the first site I cam across that had the specs for my battery showed something called "reserve capacity." My battery had a reserve capacity of 105 which seemed very high. I did a little digging and found that reserve capacity is not the same as Ah, but instead is the time in minutes that a battery can last under a 25amp load.

The derivation
To convert between the two units you first need to convert the reserve capacity time into hours by dividing by 60. For my "105" battery my reserve capacity is 1.75hours under a 25amp load. Now all you need to do is multiply the reserve capacity n hours by 25amps to give you the equivalent Amp-hour rating of your battery. This means the Ah rating of my battery is 43.75Ah. As it turns out, because of the order of opporation, it doesn't matter which order you do these two steps in. So, divinding 25amps/60(minutes/hour) gives us a constant around .417.

Hope this helps some people.

kjmccar is offline  
Reply

Tags
battery

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may 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 Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome