Charging Issues - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > Contributing Authors > Gear and Maintenance Articles
 Not a Member? 


Closed Thread
 
LinkBack Thread Tools
  #1  
Old 08-28-2001
Contributing Authors
 
Join Date: Jan 2000
Posts: 536
Thanks: 0
Thanked 8 Times in 6 Posts
Rep Power: 15
Sue & Larry is on a distinguished road
Charging Issues

This is a charging question. I have 800 amps in my house bank. This should allow me to replace 200 amps per hour if all was perfect. If I use 200 amps from the bank and starting with full batteries, I start to recharge using the engine and 150-amp altenator, but the digital amp meter says I am replacing only 50 to 60 per hour.

Why does it not place more amps per hour back into the bank? Does the quarter value of the bank charging input belong to the full amount of the bank or the amount used and being replaced? 50 to 60 amps would be one quarter of the 200 used. Also, when my voltmeter says 144 volts under charge, is the bank full? Please help me to understand this.

Sue & Larry respond: 
Thanks for your question. You are correct in your original assumption that an 800-amp-hour battery bank is capable of receiving one quarter of its capacity during charging, or 200 amps. This is only true, however, during the period of bulk charging. The bulk-charging phase of a multi-step regulator begins with a deeply discharged battery, and ends when the level of charge approaches 75 to 80 percent.

If you discharge your battery bank more greatly, say to the 50-percent level (-400 amp-hours), then by initiating the charging via your 150-amp alternator you should see a charging output from your alternator much greater than the previously reported 50 to 60 amps.

You really can't use your voltmeter to accurately determine a state of charge while your battery is still being charged. To determine your battery bank's state of charge with your voltmeter, you first need to make sure that your battery has not been charged or discharged for at least 15 minutes, and preferably several hours. To help, we've included a table below showing the correlation between state of charge and battery voltage.

Open Circuit Voltage Level of Charge

12.6 or more 100 percent
12.4 - 12.6  75 to 100 percent
12.2 - 12.4  50 to 75 percent
12.0 - 12.2  25 to 50 percent
11.7 - 12.0  0 to 25 percent
11.7 or less  dead battery

For more information see Kevin Jeffrey's Calculating Your Electrical Load

Quick reply to this message
Closed Thread

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:

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

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



All times are GMT -4. The time now is 07:32 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.