Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 24-06-2010, 19:42   #1
Registered User

Join Date: Jul 2009
Posts: 31
Electrical Diagram

hey all you 12volt gurus i have a quick question. my boat 12 volt system goes as follows.
from the alternator there is a big battery wire that runs from the back of the alternator to the back of my batt switch center pole. from my batt switch my house battery and start batteries are connected. my question is this my buddy's boats alternator goes directly to his house battery and he has some kind of solenoid on a switch that connects the 2 batteries together for charging. now is this a better method of charging batteries than mine is my setup incorrect or ????? thanks all
__________________

__________________
davevancat is offline   Reply With Quote
Old 24-06-2010, 20:25   #2
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 5,781
his is automatic, your's in manual. yours has a downside, the person can forget to seperate or combine the batteries. your friends is automatic, but the solenoid can fail.
I wired ours with the alt to the house, with a solenoid controlled by the alt regulator to parallel when the house is charged.
__________________

__________________
Sailmonkey is offline   Reply With Quote
Old 25-06-2010, 08:51   #3
Registered User

Join Date: Jul 2009
Posts: 31
thanks for the reply sailmonkey now is there any performance difference between the 2 setups. does 1 mtheod charge faster or better than the other , aside from user error with the battery switch is the charging still the same.
__________________
davevancat is offline   Reply With Quote
Old 25-06-2010, 09:46   #4
Marine Service Provider
 
AnchorageGuy's Avatar

Join Date: Mar 2003
Location: Wherever the boat is!
Boat: Marine Trader 34DC
Posts: 4,618
Our alternator connects to the house bank with an echo charger to the start battery. Has worked great for a long time. The house and start batteries are right next to each other, so we have a pair of jumper cables for emergencies. We have never had to use the jumpers.
__________________
Chesapeake Bay, ICW Hampton Roads To Key West, The Gulf Coast, The Bahamas

The Trawler Beach House
Voyages Of Sea Trek
AnchorageGuy is offline   Reply With Quote
Old 25-06-2010, 14:30   #5
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 5,781
Quote:
Originally Posted by davevancat View Post
thanks for the reply sailmonkey now is there any performance difference between the 2 setups. does 1 mtheod charge faster or better than the other , aside from user error with the battery switch is the charging still the same.
Yes and no. If you have no smart regulator neither method will charge any better or worse than the other. Generally when you go straight to the house bank you've already upgraded the alternator and regulator and house bank. When this is done you usually have a batt temp sensor that should be on the bank that is fed directly by the alt. So if done in this manner.........yes the direct to the battery will charge better, but there's a lot more information that'd be needed from you to make any further judgement on either system!!
__________________
Sailmonkey is offline   Reply With Quote
Old 25-06-2010, 20:18   #6
Senior Cruiser
 
osirissail's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: A real life Zombie from FL
Boat: Gulfstar 53 - Osiris
Posts: 5,416
Images: 2
The alternator feed should be routed directly to a battery bank - or through a diode to several battery banks. Wiring the alternator output to the common terminal on the main battery switch is rather dangerous to the life of your alternator - especially if you are running the engine and forgot to put the battery switch in "both" BEFORE starting the engine. Switching the battery switch with the alternator running can "disconnect" the alternator from its battery "load" resulting in voltage "run-a-way" and failure of the alternator. There are special main battery switches that have a "field" interruptor provision to protect the alternator, but if your main battery switch does not have this feature be sure to move the alternator output cable off the "common" terminal and to one or the other battery cable terminals on the switch.
__________________
osirissail is offline   Reply With Quote
Old 27-06-2010, 14:09   #7
Commercial Member
 
CharlieJ's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: St. Petersburg, FL
Boat: Gulfstar Long Range Trawler; 53'; BearBoat
Posts: 837
Quote:
Switching the battery switch with the alternator running can "disconnect" the alternator from its battery "load" resulting in voltage "run-a-way" and failure of the alternator.
Only if you rotate the switch through the OFF position and that is why some switches have the optional field disconnect feature. Otherwise, modern battery switches have make before break contacts when going from either 1 or 2 to BOTH.

Charlie
__________________

__________________
Charlie Johnson
JTB Marine Corporation
"The Devil is in the details and so is salvation."
CharlieJ is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Yanmar Wiring Diagram GordMay Engines and Propulsion Systems 2 15-11-2015 03:11
Complicated Electrical Question - Good Puzzle for You Electrical Geniuses Dockhead Electrical: Batteries, Generators & Solar 36 07-09-2010 07:14
Wiring Harness Diagram Meck Marine Electronics 0 07-06-2009 21:46
Sailrite threading diagram By Invitation Auxiliary Equipment & Dinghy 8 11-04-2008 03:19
Spring Lines diagram kmunik8 Liveaboard's Forum 2 29-12-2007 13:39



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 22:16.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.