Battery Charging . . . again !! - Page 3 - SailNet Community
LinkBack Thread Tools
post #21 of 21 Old 09-09-2008
Join Date: Nov 2007
Location: Florida/Bahamas
Posts: 63
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
Originally Posted by MrSeaDragon View Post

Questions : Regardless of how my batteries are combined the alternator will at some point be charging 1 almost full battery and 1 almost empty battery bank, so what charge level (voltage?) does it use to determine its output ?
If there is one voltage regulator for both batteries the charging device will see a voltage that is a combination of the two battery voltages. If both batteries were the same size, the voltage would be close to the average of the two batteries, but if one is a lot larger than the other, then its voltage will overwhelm the other to some degree. A large house batt at 11 volts and a small starting batt at 12.6 volts might result in a combined voltage of (guessing) 11.5 volts. This means the charger will pump out close to its maximum......but most of the current will flow into the house batt that needs it.

Bottom line.....don't worry about it, except in the case where you do not charge for very long and the starting battery has the potential to give up some of its charge to the house bank.
SYMandalay is offline  
Quote Quick Reply Share with Facebook
Sponsored Links

Quick Reply

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


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


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
Choosing Batteries Kevin Jeffrey Gear and Maintenance Articles 0 04-07-2003 08:00 PM
Choosing Batteries Kevin Jeffrey Cruising Articles 0 04-07-2003 08:00 PM
Installing a New Battery Bank Sue & Larry Gear and Maintenance Articles 0 09-26-2002 08:00 PM
Charging Batteries Sue & Larry Gear and Maintenance Articles 0 09-25-2002 08:00 PM
Boat Battery Power East Penn Manufr. Gear and Maintenance Articles 0 01-18-1999 07:00 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