Reply
 
Thread Tools Display Modes
 
Old 06-04-2012, 01:49 PM   #1
Guru
 
City: Pensacola
Country: USA
Join Date: May 2012
Posts: 748
Battery Charging

Question,
My new to me boat, has two 12V house batteries. When I am running Generator battery switch is set to "Both" to recharge.

When I am on Shore Power I also set it to "Both"

Battery Charger is also on.

Should I keep Battery Charger to "ON" when on Shore power? Does this act as a charger and float after batteries are charged?

When Shoudl I turn Charger off?

Thoughts?

thanks
__________________
Advertisement

Blue Heron is offline   Reply With Quote
Old 06-04-2012, 04:22 PM   #2
Guru
 
skipperdude's Avatar
 
City: Whittier AK
Country: USA
Vessel Name: Apache II
Vessel Model: 1974 Donald Jones
Join Date: Oct 2007
Posts: 3,147
Depending on your charger.
When on shore power the charger should keep your batteries fully charged.
I don't see any reason to turn off the charger.
Sd
__________________

__________________
If you can't repair it maybe it shouldn't be on the boat
skipperdude is offline   Reply With Quote
Old 06-04-2012, 05:49 PM   #3
Guru
 
ben2go's Avatar
 
City: Upstate,SC
Country: USA
Vessel Name: The Caroliner
Vessel Model: Plans to build 30' Spira Sitka
Join Date: May 2012
Posts: 1,080
If you are on shore power,there should be a disconnect(some are automatic) or transfer switch to run the boat from shore power while the charger works it magic on the batteries.Some chargers are capable of charging batteries while running some DC electrical.You may want to check out your wiring.Your switch set on both could be to charge both house batteries, or charge both house batteries and the starting battery.
ben2go is offline   Reply With Quote
Old 06-04-2012, 09:36 PM   #4
Senior Member
 
Fighterpilot's Avatar
 
Join Date: Apr 2011
Posts: 373
As I understand it some of the older chargers aren't regulated and can continue to send too much current to the batteries, hence shortening their life. With my old Guest charger I have been advised to monitor the battery charge and turn the charger off when batteries charged. The newer chargers have 3 stages which permits them to be on all the time.
Fighterpilot is offline   Reply With Quote
Old 06-04-2012, 09:50 PM   #5
Guru
 
Edelweiss's Avatar
 
City: PNW
Country: USA
Vessel Model: 1976 Californian Tricabin LRC
Join Date: May 2011
Posts: 1,834
Quote:
Originally Posted by Blue Heron View Post
Question,
My new to me boat, has two 12V house batteries. When I am running Generator battery switch is set to "Both" to recharge.

When I am on Shore Power I also set it to "Both"

Battery Charger is also on.

Should I keep Battery Charger to "ON" when on Shore power? Does this act as a charger and float after batteries are charged?

When Shoudl I turn Charger off?

Thoughts?

thanks
--------------------------------------------------------
If you have a newer marine charger, chances are it will maintain your batteries and provide 12 volt house power all at the same time. A modern marine charger has IC controlled charging circuits and is programed to maintain your batteries and can be left on 24 x 7 x 365, without trickle charging or boiling your batteries, which over time ruins them. Read your chargers manual or download it if you don't have one.

Just changed out my oldest battery bank this Spring and they were 11 years old and still going strong.

My charger brings all three battery banks up to a predetermined charge state and then turns off and monitors the batteries until they need to be recharged again or when 21 days elapse. Mine also monitors and charges all three battery banks regardless of what the battery switch is switched to. The battery switch only controls which battery bank is being discharge, not the battery charger. Check out how yours is wired while you are at it.
Larry B
Edelweiss is offline   Reply With Quote
Old 06-05-2012, 08:55 AM   #6
Guru
 
City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,390
Quote:
Originally Posted by Blue Heron View Post
Question,
My new to me boat, has two 12V house batteries. When I am running Generator battery switch is set to "Both" to recharge.

When I am on Shore Power I also set it to "Both"

Battery Charger is also on.

Should I keep Battery Charger to "ON" when on Shore power? Does this act as a charger and float after batteries are charged?

When Shoudl I turn Charger off?
If you really mean what you posted ("My new to me boat, has two 12V house batteries"), your two house batteries are already connected together in parallel as a "bank" so the switch position doesn't matter. Whatever is connected to one is connected to the other through the cables.

As far as leaving a battery charger on 24/7, you have to know what sort of charger you have. If it's a modern "smart charger", it's designed to be left on and connected 24/7 and it will sense the battery voltage and supply only what charge is needed to maintain the batteries in a fully charged state.

If it's not a smart charger, you should monitor the batteries yourself and turn it off when they are charged. Or, replace it with a smart charger.
__________________

rwidman is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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 Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 08:34 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012