Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 21-05-2010, 12:54   #16
Registered User

Join Date: Oct 2006
Location: Tortola
Posts: 700
Images: 1
Send a message via Yahoo to bvimatelot Send a message via Skype™ to bvimatelot
Quote:
Originally Posted by biltong View Post
Can anyone or everyone try and explain the process of electrolysis on yachts, especially when surrounded by other boats in a harbour. How will being connected to shore power via a battery charger affect the situation. I thought I knew the answer to this, but the more people I ask, the more answers I get.
Well - I can't help with any answers but co-incidentally, I picked up a boat which had just been splashed, in Mobile, for onward delivery to BVI. Did all the pre-voyage checks etc but by the time I got to USVI, this had happened.

Initially, I thought the yard where a lot of work, including stainless, had been done, had used "Ace Hardware" screws instead of marine grade SS but then, due to numerous annoying electrical problems en route, I began to think electrolysis.

Sure enough, when my favourite electric guys in Tortola ran the meter over it, the boat was producing a stray current. Well - that bit's easy....its finding the casuse which can take time. Luckily we found it on the first go - a bad bow light wire which had not been helped by the amount of green stuff we'd taken over the bows on the long beat down.

So - if you think you've got an electrolysis problem - get on it asap!!
Attached Thumbnails
Click image for larger version

Name:	P5060089.jpg
Views:	81
Size:	429.9 KB
ID:	16358   Click image for larger version

Name:	P5060087.jpg
Views:	84
Size:	436.6 KB
ID:	16359  

__________________

__________________
bvimatelot is offline   Reply With Quote
Old 21-05-2010, 13:07   #17
Moderator Emeritus
 
David M's Avatar

Cruisers Forum Supporter

Join Date: Sep 2007
Location: San Francisco Bay
Boat: research vessel
Posts: 10,150
In a nutshell, an isolation transformer stops stray direct current between your boat and the marinas electrical system.

It stops your boat from becoming its sacrificial anode via your shore power cable. You can still get electrolysis from other sources though.
__________________

__________________
David

Life begins where land ends.
David M is offline   Reply With Quote
Old 21-05-2010, 13:27   #18
Registered User

Join Date: Feb 2010
Location: Durban South Africa
Boat: L 34
Posts: 279
Don't forget here that your whole boat (inside and out ) is wet or at least damp enough, with SALT water. Any amount of insulation is pretty well ineffective as the coating of this dampness on fibreglass, across rubber/plastic/wood makes for an electrical connection, between everything, sufficient to give you electrolysis nightmares.
__________________
holmek is offline   Reply With Quote
Old 21-05-2010, 15:41   #19
Moderator
 
Boracay's Avatar

Cruisers Forum Supporter

Join Date: Feb 2004
Location: Pelican Bay, Great Sandy National Park
Boat: Steel Roberts Offshore 44
Posts: 5,175
Images: 18
Multimeter probe into bilge water...

I got a reading of +.04V when I stuck a multimeter probe into my bilge water.

Lifting the switch and pump out of the "sump' and keeping the bilge dry has (hopefully) greatly reduced the problem.
__________________
Rust never sleeps
Boracay Blog.
Boracay is offline   Reply With Quote
Old 22-05-2010, 01:41   #20
Registered User
 
biltong's Avatar

Join Date: Nov 2009
Location: Knysna, South Africa
Boat: Sadler 26
Posts: 138
Thank you to everyone who responded to my thread. Though more informed and educated than before on this subject, I am more confused than ever. I think I will be using a wooden engine, through hull fittings and prop from now on. And if that doesn't work, I am going to start using wooden batteries too.
__________________
Arguing with a fool is two fools arguing
biltong is offline   Reply With Quote
Old 22-05-2010, 10:23   #21
Registered User

Join Date: Jan 2010
Location: Wells, Vt
Boat: 42ft Colvin Gazelle - TLA HLA
Posts: 504
Do be careful when using wood! Electrolysis and attempts to protect it on wodden hulls can cause severe rot problems!!
Yes, true..
__________________

__________________
ConradG is offline   Reply With Quote
Reply

Tags
electrolysis

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
Electrolysis Bonding Question Beausoleil Electrical: Batteries, Generators & Solar 35 07-01-2011 06:41
Yanmar 3GM30F Engine Electrolysis Xtofinooic Engines and Propulsion Systems 8 12-06-2010 08:08
Mast Electrolysis cvondo Deck hardware: Rigging, Sails & Hoisting 3 16-12-2009 18:45
Electrolysis bill good Electrical: Batteries, Generators & Solar 6 29-06-2009 06:32
Power Leaking and Electrolysis... svHyLyte Electrical: Batteries, Generators & Solar 33 27-04-2006 16:23



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 03:15.


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.