Reply
 
Thread Tools Display Modes
 
Old 02-10-2015, 03:06 PM   #1
Senior Member
 
On The Rocks's Avatar
 
City: Palm Springs CA
Country: USA
Vessel Name: On The Rocks
Vessel Model: Gulf Star MKII
Join Date: Apr 2012
Posts: 109
Connecting 12V Windlass to 24V bank

I have a 12 volt windlass and a 24 volt bow thruster with two 12 volt batteries in the bow wired to make 24 volts. The windlass is wired to battery bank in engine room and the cables are long and undersized.

Any suggestion for wiring the 12 volt windlass to the 24 volt bank so the cables will be shorter and hopefully less expensive? I was thinking of using a 24 to 12 volt converter but don't have any experience with them.
__________________
Advertisement

On The Rocks is offline   Reply With Quote
Old 02-10-2015, 04:28 PM   #2
TF Site Team
 
FlyWright's Avatar
 
City: California Delta and SF Bay
Country: Sacramento, CA, USA (boat in Vallejo)
Vessel Name: FlyWright
Vessel Model: Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 10,162
OTR, I moved your post into a new thread so your post can achieve greater visibility. Hoping someone with a similar setup can provide some guidance.

Also, I would refer you to Nigel Calder's book, Boatowner's Mechanical and Electrical Manual: How to Maintain, Repair, and Improve Your Boat's Essential Systems
__________________

__________________
Al

Custom Google Trawler Forum Search
FlyWright is offline   Reply With Quote
Old 02-10-2015, 04:51 PM   #3
Guru
 
psneeld's Avatar
 
City: Avalon, NJ
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 15,853
just wire it to the poles of one battery....


here is another component that can come in handy if you change things around...


http://www.wmjmarine.com/bpspe.html
psneeld is offline   Reply With Quote
Old 02-10-2015, 07:54 PM   #4
Guru
 
djmarchand's Avatar
 
City: East Greenwich, RI
Country: USA
Vessel Name: Bella
Vessel Model: Mainship Pilot 34
Join Date: Aug 2012
Posts: 2,874
To expand a bit on psneeld's comment: wire your 12 V windlass to the positive and negative of one battery, preferably the one which supplies the negative to the 24V thruster. That way you won't get a short if you somehow tie the two negatives together.

I presume that you have some way of charging your 24V battery.

David
djmarchand is offline   Reply With Quote
Old 02-11-2015, 07:13 AM   #5
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,512
Center taping a pair of batts is theoretically not ideal.

But it works , well , as long as the low voltage battery does not get too depleted.

With the short use of most windlasses you should have no problem.

Each spring swop the batts place for place , as it might extend the service life.

For extra long run times a 1-2 rotary switch might allow selection.
FF is offline   Reply With Quote
Old 02-11-2015, 10:18 AM   #6
Guru
 
City: Venice Louisiana
Country: United States
Join Date: Dec 2013
Posts: 1,097
What is the make of the windlass. I would change the motor for a 24 volt if possible. Or may be able to have it converted by a good starter/alternator shop.
kulas44 is offline   Reply With Quote
Old 02-11-2015, 11:40 AM   #7
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 3,879
Second that about finding a 24v motor. Drawing off 12v out of a 24v pair causes one batt to go low, the other to overcharge. How bad that happens depends on how many AH you ask of it, size of batts, how often its used, etc.
Ski in NC is offline   Reply With Quote
Old 02-12-2015, 07:02 AM   #8
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 16,512
If NOT overloaded a 12V motor is quite happy running on 24V.

The hassle only comes IF you attempt to get the power a 24V motor could provide .

If you stick with the lifting rating the 12V is rated for it should be no problem.
FF is offline   Reply With Quote
Old 02-12-2015, 07:45 AM   #9
Guru
 
Northern Spy's Avatar
 
City: Powell River, BC
Country: Canada
Vessel Name: Northern Spy
Vessel Model: Nordic Tug 26
Join Date: Feb 2012
Posts: 2,665
Except that unless one changes the gearing it will spin the prop faster which will just lead to massive cavitation.

Center battery tap is definitely not advised, as others have said.

Motor swap to 24v or a voltage converter. Not sure if the converter is realistic due to the amperage involved.
Northern Spy is offline   Reply With Quote
Old 02-12-2015, 08:13 AM   #10
Guru
 
psneeld's Avatar
 
City: Avalon, NJ
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 15,853
Seems like the fishing crowd with 24V trolling motors have some ideas how to set the rig up with one exception. I saw a lot of discussion on the Continuous Wave forum that I believe is mostly abut Boston Whalers.

Most of the ideas add the second battery for 24V just temporarily....the rest of the time they charge individually as 12V.
psneeld is offline   Reply With Quote
Old 02-12-2015, 08:20 AM   #11
Dauntless Award
 
Wxx3's Avatar
 
City: New York, NY
Country: USA
Vessel Name: Dauntless
Vessel Model: Kadey Krogen 42 - 148
Join Date: Jan 2013
Posts: 2,312
Quote:
Originally Posted by psneeld View Post
Seems like the fishing crowd with 24V trolling motors have some ideas how to set the rig up with one exception. I saw a lot of discussion on the Continuous Wave forum that I believe is mostly abut Boston Whalers.

Most of the ideas add the second battery for 24V just temporarily....the rest of the time they charge individually as 12V.
As in using a battery switch?? Ingenious.
__________________
M/Y Dauntless, New York
a Kadey Krogen 42 Currently https://share.delorme.com/dauntless
Blog: https://dauntlessatsea.com
Find us: https://share.delorme.com/dauntless
Wxx3 is offline   Reply With Quote
Old 02-12-2015, 08:53 AM   #12
Guru
 
Mule's Avatar
 
City: Fort Pierce
Country: USA
Vessel Name: Florita Ann
Vessel Model: 1982 Present
Join Date: May 2014
Posts: 1,784
This is easy. Give your windlass a dedicated battery up front close to the winlass. Replace from battery to windlass with up sized cables to feed same. A short run, might be able to work something out for chain locker. Use the undersized cables for your charging circuit, charge the 12 volt battery with a small solar panel. You already have wiring from ER to new battery so 14 gage, even less from panel to ER is all additional wiring needed and it is likely dead wire from bridge may already be there on an older boat as surly ur Gulf Star is.

I did this to a my last boat to power a bow thruster and windlass to avoid a long run of very large battery cable. The fire risk concerned me also insofar I had a 100 amp charger. All that high amp traffic under decks concerned me. So I just did a work around for (perhaps unneeded) peace of mind.
Mule is offline   Reply With Quote
Old 02-12-2015, 08:53 AM   #13
Guru
 
psneeld's Avatar
 
City: Avalon, NJ
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 15,853
You know it is never that simple.....

Here's one discussion with diagrams of possibilities....

Mixed 12-volt and 24-volt Primary Power with Three Batteries - Moderated Discussion Areas
psneeld is offline   Reply With Quote
Old 02-12-2015, 12:36 PM   #14
Senior Member
 
On The Rocks's Avatar
 
City: Palm Springs CA
Country: USA
Vessel Name: On The Rocks
Vessel Model: Gulf Star MKII
Join Date: Apr 2012
Posts: 109
Windlass is a Lewmar Profish 1000. I'll check the Lewmar site to see if a 24 volt motor is available and consider the cost. The 24 volt battery s charged by a 12 to 24 charger wired to the house bank. Running 24 volts to the 12 volt windlass would be the simplest solution and I wasn't looking to get more power than what I have now. Are there any concerns about burning up the motor?
On The Rocks is offline   Reply With Quote
Old 02-12-2015, 12:46 PM   #15
Senior Member
 
On The Rocks's Avatar
 
City: Palm Springs CA
Country: USA
Vessel Name: On The Rocks
Vessel Model: Gulf Star MKII
Join Date: Apr 2012
Posts: 109
Just checked, Lewmar doesn't make 24 volt motor for my model.
On The Rocks is offline   Reply With Quote
Old 02-12-2015, 01:19 PM   #16
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 3,879
So you already have 12v leads from engine room to fwd to run the 12/24 converter? What gauge are those leads? If skinny maybe you can run heavier. Then windlass will run right off house batts.
Ski in NC is offline   Reply With Quote
Old 02-13-2015, 12:56 PM   #17
Senior Member
 
On The Rocks's Avatar
 
City: Palm Springs CA
Country: USA
Vessel Name: On The Rocks
Vessel Model: Gulf Star MKII
Join Date: Apr 2012
Posts: 109
Yes there are12 volt cables from the house bank now. However, they are as old as the boat and small. The reason I was looking at the thruster bank was to shorten the cable run by about 20 feet.
On The Rocks is offline   Reply With Quote
Old 02-13-2015, 01:29 PM   #18
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 3,879
Windlass draws no where near what a thruster does, also volt drop is not that critical on windlass. So you don't have to be that anal about using thick cables.

Any idea what gauge the 12v cables are?
Ski in NC is offline   Reply With Quote
Old 02-13-2015, 01:53 PM   #19
Senior Member
 
On The Rocks's Avatar
 
City: Palm Springs CA
Country: USA
Vessel Name: On The Rocks
Vessel Model: Gulf Star MKII
Join Date: Apr 2012
Posts: 109
Most of it is 4 AWG that is old non-tinned somewhat corroded, maybe welding cable? There is a splice of newer 6 AWG where it connects to the windlass switch at the helm on it's way foreward. Maybe you are right about over thinking it after all it still works fine.
On The Rocks is offline   Reply With Quote
Old 02-13-2015, 02:09 PM   #20
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 3,879
4ga should be plenty thick, but that is without knowing actual amp draw. Maybe just clean up cable ends or maybe put on new lugs.
__________________

Ski in NC 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 01:04 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