Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 06-04-2013, 10:08   #1
Registered User

Join Date: Aug 2012
Location: All Over
Boat: Seafarer 34 CB
Posts: 118
Battery Wiring Diagram - Help

I am starting completely from scratch. New everything. Wiring, batteries, switches, etc. I have 4 6v house batteries I will be wiring to make a 12v bank. I have a second bank consisting of a single 12v starting battery. I have made a diagram (sorry if it is tough to follow).

Can someone out there with real experience check this an make sure I am not going to screw it up! I have a 3-bank 40 amp charger and my inverter will only run off the house bank. I am focused primarily on the DC systems right now. I can't seem to figure our how to get my alternator to both banks? !!

What am I missing and where. Keep in mind, I'm not always hip to lingo.

__________________

__________________
Follow us as we sail through the Caribbean www.sailingchance.com
facebook.com/sailingchance
SailingChance is offline   Reply With Quote
Old 06-04-2013, 10:47   #2
Registered User

Join Date: Oct 2007
Location: virginia
Boat: islandpacket
Posts: 1,839
I would get rid of 1-2-all switch and use an echo charger for the starter batt
__________________

__________________
That derelict boat was another dream for somebody else, don't let it be your nightmare and a waste of your life.
Badsanta is offline   Reply With Quote
Old 06-04-2013, 10:50   #3
Moderator
 
HappyMdRSailor's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: North Mississippi
Boat: 48 Wauquiez Pilot Saloon-C22 Chrysler Sunpiper- 19 Potter-Preparing to cruise w/my girl
Posts: 5,980
Re: Battery Wiring Diagram - Help

Chance.... I am by no means an expert... But your diagram looks great to me... Here's what I would do with your dilemma... Others may have better ideas... To charge the start battery, add either another battery switch isolating the start battery + from the "C" on the main switch, or a "battery isolator (=one way diode)" from C to the start +

Does your switch not have a 1, 2, and "both" selection? If so, you can revise from above .... = (you're a smart guy)

Make sense?

Cheers!
__________________
In the harsh marine environment, something is always in need of repair...

Mai Tai's fix everything...
HappyMdRSailor is offline   Reply With Quote
Old 06-04-2013, 10:59   #4
Registered User
 
Stu Jackson's Avatar

Join Date: Jan 2011
Location: Cowichan Bay, BC (Maple Bay Marina)
Posts: 6,389
Re: Battery Wiring Diagram - Help

Good start on the diagram, but for starters to answer your question: "Engine" should be separated into two things: Alternator (for alternator output: "AO") and starter. The AO should go to the house bank, the starter gets fed from the C post of the switch.

You may be interested in these links which answer all your questions:

Basic Battery Wiring Diagrams This is a very good basic primer for boat system wiring: Basic Battery Wiring Diagrams

This is another very good basic primer for boat system wiring: The 1-2-B Switch by Maine Sail (brings together a lot of what this subject is all about)
1/BOTH/2/OFF Switches Thoughts & Musings - SailboatOwners.com

After reading those, ask away.
__________________
Stu Jackson
Catalina 34 #224 (1986) C34IA Secretary
Cowichan Bay, BC, (Maple Bay Marina) SR/FK, M25, Rocna 10 (22#) (NZ model)
Stu Jackson is offline   Reply With Quote
Old 06-04-2013, 11:01   #5
Registered User

Join Date: Jul 2006
Posts: 3,949
Re: Battery Wiring Diagram - Help

Quote:
Re: Battery Wiring Diagram - Help
Good starts, but for starters to answer your question: "Engine" should be separated into two things: Alternator (for alternator output: "AO") and starter.

You may be interested in these links which answer all your questions:

Basic Battery Wiring Diagrams This is a very good basic primer for boat system wiring: Basic Battery Wiring Diagrams

This is another very good basic primer for boat system wiring: The 1-2-B Switch by Maine Sail (brings together a lot of what this subject is all about)
1/BOTH/2/OFF Switches Thoughts & Musings - SailboatOwners.com

After reading those, ask away.
^^This^^
__________________
Kettlewell Cruising
Kettlewell is offline   Reply With Quote
Old 06-04-2013, 11:05   #6
Senior Cruiser

Cruisers Forum Supporter

Join Date: Jul 2006
Location: Chesapeake Region and Maine
Boat: 42' Bob Perry sloop
Posts: 4,038
Images: 4
Re: Battery Wiring Diagram - Help

Here you go.

Click image for larger version

Name:	Basic12VDCr.jpg
Views:	643
Size:	95.4 KB
ID:	58665

Bill
__________________
btrayfors is offline   Reply With Quote
Old 06-04-2013, 11:15   #7
Marine Service Provider

Join Date: Dec 2003
Location: South Carolina
Boat: Philip Rhodes Custom
Posts: 395
Re: Battery Wiring Diagram - Help

An echo charger as suggested above has very limited output (15 amps I believe) and would require rewiring the alternator to charge the house battery.

A Combiner100 for half the price will handle the output of a 100 amp alternator so you can leave the alternator on the starting battery. If your alternator is rated over 100 amps, the Combiner160 will handle a 200 amp alternator.

The Combiners are also bi-directional so your shore power charger will also maintain the starting battery.

Installation is elementary, one cable on battery switch terminal 1, one cable on battery switch 2, and a light gauge cable to negative.

Charging then becomes fully automatic and you only need to use the selector switch for things like emergency starting if the starting battery died.
__________________
Andina Marie is offline   Reply With Quote
Old 06-04-2013, 16:54   #8
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 7,930
Re: Battery Wiring Diagram - Help

Quote:
Installation is elementary, one cable on battery switch terminal 1, one cable on battery switch 2, and a light gauge cable to negative.
This is so not right. Read the fore mentioned links and follow their good advice as well as btrayfors.
__________________
The Blue Dot Campaign. This Changes Everything.
DeepFrz is offline   Reply With Quote
Old 06-04-2013, 18:28   #9
Registered User
 
Teknav's Avatar

Join Date: Jul 2012
Location: Texas - USA
Boat: Twin Otter de Havilland Floatplane
Posts: 1,838
Re: Battery Wiring Diagram - Help

Do you really want to do this wiring on your own? As an EE, I wouldn't recommend it! Please pay a licensed marine electrician, for his knowledge and time. There are also legals repercussions to consider, if your wiring is not up to "code"; your insurance company will deny you benefits/coverage, should your boat catches an electrical fire. This is not the time and place to experiment. Mauritz
__________________
Teknav is offline   Reply With Quote
Old 06-04-2013, 21:50   #10
Marine Service Provider

Join Date: Dec 2003
Location: South Carolina
Boat: Philip Rhodes Custom
Posts: 395
Re: Battery Wiring Diagram - Help

Quote:
Originally Posted by DeepFrz View Post
This is so not right. Read the fore mentioned links and follow their good advice as well as btrayfors.
Hmm, you say "This is so not right" but no explanation of what is wrong? Combiners have been available for 20 years, you connect one power lead to each battery and connect the negative. What is wrong?.
__________________
Andina Marie is offline   Reply With Quote
Old 06-04-2013, 22:20   #11
Senior Cruiser

Cruisers Forum Supporter

Join Date: Dec 2006
Location: Seattle
Boat: Cal 40
Posts: 2,401
Images: 7
Re: Battery Wiring Diagram - Help

Quote:
Originally Posted by DeepFrz View Post
This is so not right. Read the fore mentioned links and follow their good advice as well as btrayfors.
Interesting, I did read MaineSails link above. He states that the "factory wiring" of 1-2-both works simply. An upgrade would be to use a battery combiner, an additional optional upgrade would be to run a wire directly from the alternator to the house bank.

So the simple solutions discussed above do work. Maine Sail does go into why other methods are less prone to human error, and have other advantages, but he doesn't say that the simple does not work.

I managed to sail for a couple of decades with a 1-2-both switch without blowing any diodes or flattening the start battery.

I'm not against making things easier, but I don't insist that every other way is wrong.
__________________

__________________
cal40john is offline   Reply With Quote
Reply

Tags
battery, wiring

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




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 15:26.


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.