Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 03-04-2016, 01:38   #1
Registered User

Join Date: Nov 2015
Posts: 1
Battery terminal melted?

I have newish twin 150 hp Iveco engines in a 1967 classic Hagg 36 MY. Last week I had little life in my 4 batteries wired for 24 volts. On close examination the positive terminal on one battery was found to be "melted" and the battery has been replaced. I have asked my engineer (French) to find out if this was a battery defect or a fault in the charging system. The batteries are 2 years old and kept on a voltage sensitive charger when not in use. Any ideas why this has happened? I am worried in case it happens again.
__________________

__________________
kyanos is offline   Reply With Quote
Old 03-04-2016, 01:48   #2
Senior Cruiser
 
atoll's Avatar

Cruisers Forum Supporter

Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,prout snowgoose 37 elite catamaran!
Posts: 9,311
Images: 75
Re: Battery terminal melted?

could be caused by high resistance in the terminal clamp ,either dirty or corroded wire .
corroded swage fitting,loose connection ,dirty terminal etc

you will probably find their was lots of life left in your batteries,just a bad connection,with resulting meltdown when you tried to start the engine,ie draw a high amp load via a bad connection,resulting in heat build up.
__________________

__________________
my catamaran building project updates http://www.cruisersforum.com/forums/...36#post2502136
atoll is offline   Reply With Quote
Old 03-04-2016, 04:19   #3
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,583
Images: 240
Re: Battery terminal melted?

Greetings and welcome aboard the CF, kyanos.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 03-04-2016, 05:25   #4
Marine Service Provider
 
boatpoker's Avatar

Join Date: Nov 2008
Location: Toronto, Ontario or Bahamas
Boat: Benford 38 Fantail Cruiser
Posts: 2,593
Re: Battery terminal melted?

Another good case for fuse protection of the positive conductor.
__________________
That hysterical laughter you hear as you sail a way in your "new" boat ..... is the seller.
boatpoker is offline   Reply With Quote
Old 03-04-2016, 19:39   #5
Registered User

Join Date: Feb 2014
Location: Niagara Falls
Boat: Westsail 32
Posts: 346
Re: Battery terminal melted?

+1 for Atoll. I've seen that here, once. (Not twice!!)
__________________
Seymore is offline   Reply With Quote
Old 03-04-2016, 20:06   #6
Senior Cruiser
 
Jim Cate's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: cruising SW Pacific
Boat: Jon Sayer 1-off 46 ft fract rig sloop strip plank in W Red Cedar
Posts: 11,461
Re: Battery terminal melted?

Quote:
Originally Posted by boatpoker View Post
Another good case for fuse protection of the positive conductor.
If the heating was due to a high resistance connection at the terminal, as has been suggested, no overcurrent would have been involved, and a fuse would not have changed the outcome.

jim
__________________
Jim and Ann s/v Insatiable II , lying Port Cygnet, Tasmania once again
Jim Cate is online now   Reply With Quote
Old 03-04-2016, 20:17   #7
Registered User

Join Date: Jan 2013
Posts: 203
Re: Battery terminal melted?

Dirty connection. My machine operators would come in and say they heard a buzz in the battery box and no start.

Opened it up and a post was melted. This was more common in 24 volt systems.
__________________
twinboat is offline   Reply With Quote
Old 04-04-2016, 14:30   #8
Senior Cruiser
 
River Cruiser's Avatar

Cruisers Forum Supporter

Join Date: Jul 2011
Location: UMR mm 283 /winter in Kansas
Boat: Bayliner 3870 41' oal.
Posts: 817
Re: Battery terminal melted?

I still have a set of post molds for replacing post when this happens. I would clean the surface screw a short screw part way into what is left of the old post and melt lead into the mold. A lot of times I used the battery voltage with a jumper cable and a carbon rod to melt the lead in the mold to be sure the old and new bonded.


Sent from my iPad using Cruisers Sailing Forum
__________________
River Cruiser is offline   Reply With Quote
Old 04-04-2016, 14:34   #9
Registered User

Join Date: Apr 2011
Posts: 2,243
Re: Battery terminal melted?

When I was looking for a bad connection in the wiring between my battery and starter, I was able to find it by feeling for the hot terminal. Do this with caution, though!
__________________
Bristol 31.1, SF Bay.
MarkSF is offline   Reply With Quote
Old 05-04-2016, 10:21   #10
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2014
Location: Anacortes
Boat: previous - Whitby 42 new - Goldenwave 44
Posts: 1,735
Re: Battery terminal melted?

While a dirty or corroded terminal could be the cause, most likely it was a loose terminal. If the terminal got that hot the cable probably needs to be replaced for some distance from the melted terminal, that is, don't put a new terminal on the old cable end. The battery or a charging device or a heavy use of the battery would not cause a terminal to melt. The battery would go first if the battery got that hot - expand and burst, explode, etc.

Also, make sure the terminal always is put the first thing down at the battery with any washers on top of the terminal. Stainless steel washers are not good conductors of electricity and can get very hot if between the terminal and the battery. Stainless steel is okay for this use - on top.
__________________
exMaggieDrum is offline   Reply With Quote
Old 05-04-2016, 21:11   #11
Registered User

Join Date: Apr 2007
Location: Australia
Boat: Island Packet 40
Posts: 1,373
Images: 7
Re: Battery terminal melted?

I have had two experiences in the last few years with stainless steel washers causing very high resistances under high current loads.


The first was with an anchor winch motor which persistently melted the solder from the field coil terminal on the up side. The motor was second hand and the original chrome plated brass washers and the brass nut on the terminal had been replaced with SS washers and an SS nut.


The second was with new cranking batteries which came with washers and nuts. When the battery voltage was down at all these would not crank the engine. I removed the SS washers and replaced the nuts with brass ones and have not had a problem since.
__________________

__________________
RaymondR 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Melted 110v Outlet Sandero Electrical: Batteries, Generators & Solar 26 29-12-2013 17:11
melted battery post RDW Electrical: Batteries, Generators & Solar 6 11-09-2011 06:44
Battery Terminal Cover or Cover Entire Battery Top ? sdowney717 Electrical: Batteries, Generators & Solar 5 14-07-2011 05:14
Wire Connection for 3000 watt Inverter - Look at My Melted Terminal Block KevinE Electrical: Batteries, Generators & Solar 25 26-04-2010 23:22
Norseman Swageless Terminal To Terminal Insulators GWB Classifieds Archive 0 21-09-2008 13:47



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 19:06.


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.