AH conversion - SailNet Community
 
LinkBack Thread Tools
post #1 of 6 Old 04-10-2009 Thread Starter
Junior Member
 
Join Date: Apr 2008
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
AH conversion

I have 3 Interstate deep cycle batteries for a house bank. They have 750 cranking with 160 minutes reserve. How does that convert to AH? I checked on the Interstate website but it didn't state anything in AH. I am trying to figure out just how much I have.

Thanks
Mike
MLM2 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 6 Old 04-10-2009
moderate?
 
camaraderie's Avatar
 
Join Date: May 2002
Location: East Coast
Posts: 13,877
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 16
     
What GROUP size are they?

No longer posting. Reach me by PM!
camaraderie is offline  
Quote Quick Reply Share with Facebook
post #3 of 6 Old 04-11-2009 Thread Starter
Junior Member
 
Join Date: Apr 2008
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Battery type

According to the website , they are 27M or SRM-27.
MLM2 is offline  
Quote Quick Reply Share with Facebook
post #4 of 6 Old 04-11-2009
Senior Member
 
Join Date: May 2004
Location: Long Is.
Posts: 329
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
 
This conversion is very crude. The reserve minutes capacity is the time it takes drawing 25 amps to fully discharge (<10.5 v IIRC). So 25 amps times 160/60 reserve capacity in hours gives 66 2/3 Amp Hours.

These are starting batteries, not really house bank material.
gc1111 is offline  
Quote Quick Reply Share with Facebook
post #5 of 6 Old 04-11-2009
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
Yes, but the amp-hour rating of most batteries is given for 5 and 20 hour rates of discharge, which the 25 amps is probably much higher than. So, the numbers won't be comparable. The higher the rate of discharge with respect to battery capacity, the lower the effective amp-hours rating will be.

Quote:
Originally Posted by gc1111 View Post
This conversion is very crude. The reserve minutes capacity is the time it takes drawing 25 amps to fully discharge (<10.5 v IIRC). So 25 amps times 160/60 reserve capacity in hours gives 66 2/3 Amp Hours.

These are starting batteries, not really house bank material.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #6 of 6 Old 04-11-2009
moderate?
 
camaraderie's Avatar
 
Join Date: May 2002
Location: East Coast
Posts: 13,877
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 16
     
The 25amp draw is MUCH higher than the 20hr. amp draw and can in no way be compared. Example...a typical group 31 battery rated at 100ah's at the 20 hour rate uses a draw of 5amps for 20 hours. Increasing the draw to 25 amps dramatically reduces the amphours available.
Example:
Trojan group31 25amp rating is 190 minutes...79 amp hours. At the 20 hour rate it provides 110ah's...almost 40% more. BUT...this is a TRUE deep cycle battery...not a hybrid starting/deepcycle...so you are probably looking at less of an increase with your Interstates Mike.
Assuming your 160 minute reserve # is at 25amps..the 66amp hours gc1111 quotes might convert to 80-90 amp hours at the 20 hour rate. As such I am thinking you have a group 27 battery?

No longer posting. Reach me by PM!
camaraderie is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


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 email 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



Similar Threads
Thread Thread Starter Forum Replies Last Post
Conversion from In-Mast furling to Lazy-Jacks system possible? freeheel999 Gear & Maintenance 21 09-14-2009 10:17 AM
Head - electric conversion or new electric head snw Gear & Maintenance 5 04-29-2007 07:07 AM
Conversion coat for 2 part polyurethane? equitiman Gear & Maintenance 13 12-23-2006 04:32 PM
Cal 27 Pop Top Conversion DonaldAdams General Discussion (sailing related) 2 07-10-2006 11:24 PM
MD3B Volvo-Penta sea water to fresh water conversion slosharron Gear & Maintenance 20 06-17-2003 09:08 PM

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

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