Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 29-12-2013, 19:45   #1
Registered User

Join Date: Jul 2013
Location: Refit in Port Townsend, WA
Boat: 1984 Slocum 43
Posts: 419
Battery switch question

My new-to-me 43 foot cutter has two main battery switches.

A. is a standard 1-Both-2-Off switch
B. is an On-Off switch that appears to be connected to bank 2

So if B is off, then switching A to bank 2 from Both turns power off.

It seems that B is some kind of redundant since you can easily disconnect from bank 2 by moving A to bank 1.

What might be the purpose for this configuration?

Thanks,
Bob
__________________

__________________
Mycroft is offline   Reply With Quote
Old 29-12-2013, 19:56   #2
Marine Service Provider
 
Maine Sail's Avatar

Join Date: Jan 2007
Location: Maine
Boat: CS-36T - Cupecoy
Posts: 3,060
Re: Battery switch question

Quote:
Originally Posted by Mycroft View Post
My new-to-me 43 foot cutter has two main battery switches.

A. is a standard 1-Both-2-Off switch
B. is an On-Off switch that appears to be connected to bank 2

So if B is off, then switching A to bank 2 from Both turns power off.

It seems that B is some kind of redundant since you can easily disconnect from bank 2 by moving A to bank 1.

What might be the purpose for this configuration?

Thanks,
Bob
Pretty common configuration if one wants a dedicated starting battery and yet still retain all the redundancy of the 1/2/ALL..

Wiring can look similar to this:

__________________

__________________
Marine How To Articles
Maine Sail is online now   Reply With Quote
Old 29-12-2013, 20:22   #3
Registered User

Join Date: Jul 2013
Location: Refit in Port Townsend, WA
Boat: 1984 Slocum 43
Posts: 419
Re: Battery switch question

Thanks!

So how should the switches be set for these ops:

1. Starting the engine.
2. Underway with engine running
3. Underway/anchored without the engine running
4. Berthed and hooked to shore power

I'm guessing:

1. A-1, B-On unless the starter bank 2 is dead in which case A would be switched to Both?

2. A-Both, B-On so both banks can charge?

3. A-1, B-Off so the starter bank is reserved for starting

4. A-Both, B-On so both banks can charge?

Thanks again.

Bob
__________________
Mycroft is offline   Reply With Quote
Old 30-12-2013, 02:13   #4
Registered User

Join Date: Jun 2013
Location: canada
Posts: 1,695
Re: Battery switch question

you would have to figure out the whole system to answer that question. first would be to confirm if the above picture is what you have. you'll have to look at the back of the switches and follow all the wires.

next you need to figure out what you have for a charging system. both from a shore charger and the alternator. like if you have a diode block, acr etc. and a multi bank charger.

if it's set up properly you'd never move the switches unless you had a problem or a dead battery.

if it's not set up well you'd probably have to switch to both to charge.
__________________
smac999 is offline   Reply With Quote
Old 30-12-2013, 04:16   #5
Registered User

Join Date: Dec 2013
Location: citizen of the world oceans, based UK
Boat: Steel schooner 30 mtrs
Posts: 48
Send a message via Skype™ to h the boat
Re: Battery switch question

Quote:
Originally Posted by Mycroft View Post
Thanks!

So how should the switches be set for these ops:

1. Starting the engine.
2. Underway with engine running
3. Underway/anchored without the engine running
4. Berthed and hooked to shore power

I'm guessing:

1. A-1, B-On unless the starter bank 2 is dead in which case A would be switched to Both?

2. A-Both, B-On so both banks can charge?

3. A-1, B-Off so the starter bank is reserved for starting

4. A-Both, B-On so both banks can charge?

Thanks again.

Bob
Main Sail is quite correct, it dosent matter if you have a diode splitter or not, his configuration is correct, however if the start battery is totally flat for any reason, it is always better not to switch it in, as it will draw a lot of current from your service battery, and may not be enough to start your engine. Good tip, always check your batteries regularly and keep them clean and dry on the outside and topped up with Distilled water on the inside. Unless they are of the permanently sealed type... H the Boat.
__________________
h the boat is offline   Reply With Quote
Old 30-12-2013, 05:40   #6
Marine Service Provider
 
Maine Sail's Avatar

Join Date: Jan 2007
Location: Maine
Boat: CS-36T - Cupecoy
Posts: 3,060
Re: Battery switch question

Quote:
Originally Posted by Mycroft View Post
Thanks!

So how should the switches be set for these ops:

1. Starting the engine.
2. Underway with engine running
3. Underway/anchored without the engine running
4. Berthed and hooked to shore power

I'm guessing:

1. A-1, B-On unless the starter bank 2 is dead in which case A would be switched to Both?

2. A-Both, B-On so both banks can charge?

3. A-1, B-Off so the starter bank is reserved for starting

4. A-Both, B-On so both banks can charge?

Thanks again.

Bob
Bob,

We have no way to know how your system is physically wired. If you can tell us what is connected to what & where including starter, house loads, alternator and the switches we can then help. Best to draw it out.....

The drawing I showed you is pretty generic and people mess up that wiring often so it's very hard to say how your system works without physically seeing it...
__________________
Marine How To Articles
Maine Sail is online now   Reply With Quote
Old 30-12-2013, 06:12   #7
Registered User

Join Date: Jul 2013
Location: Refit in Port Townsend, WA
Boat: 1984 Slocum 43
Posts: 419
Re: Battery switch question

Thanks guys! Looks like I need to do some more wire tracing.
__________________

__________________
Mycroft is offline   Reply With Quote
Reply

Tags
battery

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 06:07.


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.