Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 18-02-2016, 12:31   #1
Tri
Registered User

Join Date: Mar 2015
Posts: 93
Solar an Zincs

I have the feeling that the Zincs are being eaten up by the use of a Solar system on board. Is that possible and if so what to do?
__________________

__________________
Tri is offline   Reply With Quote
Old 18-02-2016, 12:43   #2
Senior Cruiser
 
Drift Woods's Avatar

Cruisers Forum Supporter

Join Date: Apr 2014
Location: Ft Lauderdale Florida
Boat: Catalina 320
Posts: 115
Re: Solar an Zincs

Great question, I just installed solar last week and I was wondering the same thing. My last boat had an electronic system to stop electrolysis and I was advised not to leave the charger plugged in 27/7
__________________

__________________
Drift Woods is offline   Reply With Quote
Old 18-02-2016, 14:17   #3
Registered User

Join Date: Jan 2016
Posts: 429
Re: Solar an Zincs

This would seem to suggest that the solar industry sees galvanic corrosion as a serious threat to installations

https://www.civicsolar.com/resource/...-installations

The average battery voltage is presumably now slightly higher than before so any pre-existing leakage path to prop, zincs etc. might have greater effect on zinc loss?
Just a guess, be interested to learn what you find out.

Good luck, hope someone with a voltmeter can help you resolve it.
__________________
unclemack is offline   Reply With Quote
Old 18-02-2016, 18:25   #4
Moderator
 
Paul Elliott's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 3,866
Images: 4
Re: Solar an Zincs

Quote:
Originally Posted by unclemack View Post
This would seem to suggest that the solar industry sees galvanic corrosion as a serious threat to installations

https://www.civicsolar.com/resource/...-installations

The average battery voltage is presumably now slightly higher than before so any pre-existing leakage path to prop, zincs etc. might have greater effect on zinc loss?
Just a guess, be interested to learn what you find out.

Good luck, hope someone with a voltmeter can help you resolve it.
The link above is referring to galvanic corrosion between the aluminum solar panel rails and the mounting hardware -- *not* the type of corrosion that leads to zinc loss. Also, battery voltage should have virtually nothing to do with zinc loss, unless there is some serious miswiring or leakage going on.

If your solar panels let you disconnect from shore power, they should improve the zinc erosion. Doing that certainly helped preserve my zincs. Just having panels shouldn't have any effect on the zincs. If you are seeing more zinc erosion that usual, you might look at any surrounding boats or changes in the marina wiring. If you are on a mooring, or at anchor, look for wiring problems. If you are plugged into shore power consider adding an isolator if you don't already have one.
__________________
Paul Elliott, S/V VALIS - Pacific Seacraft 44 #16 - Friday Harbor, WA
www.sailvalis.com
Paul Elliott is online now   Reply With Quote
Old 19-02-2016, 04:07   #5
Tri
Registered User

Join Date: Mar 2015
Posts: 93
Re: Solar an Zincs

I personally don't have shore power on board but there still seems to be a lot of galvanization going on.

The boat is hardly ever in a port.
__________________
Tri is offline   Reply With Quote
Old 19-02-2016, 06:10   #6
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 17,045
Re: Solar an Zincs

Really unless I misunderstand, you must have a wiring issue that is allowing a path for DC positive to ground, this may have been as a result of your Solar install, but it is not due to Solar, there is nothing inherit about Solar that would cause a current "leakage"

A way is to turn every thing off, so that nothing is drawing power, then disconnect and measure the amperage draw from the batteries by inserting a multimeter in line with the positive cable, if there is any current, start disconnecting circuit breakers till the current draw goes away, then you have found the circuit that may be the problem, of course some circuits draw a tiny bit of current to keep clocks set etc., too.

Or hire a an electrician to find your leakage, there are ways to measure it to that a Marine electrician may have, a reference electrode I believe its called, but the "leakage" can be measured, and or determined if you have a problem or not.

On edit, read this

assets.fluke.com/appnotes/electricalpower/B0269b_u.pdf
__________________
a64pilot is offline   Reply With Quote
Old 19-02-2016, 07:33   #7
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Re: Solar an Zincs

Quote:
Originally Posted by Paul Elliott View Post
The link above is referring to galvanic corrosion between the aluminum solar panel rails and the mounting hardware -- *not* the type of corrosion that leads to zinc loss. Also, battery voltage should have virtually nothing to do with zinc loss, unless there is some serious miswiring or leakage going on.
Galvanic corrosion is absolutely one of types of corrosion that zinc anodes provide protection from, and therefore would cause anode depletion. But you are right; without some other underlying problem, a solar charging system should have no effect on anode wastage.
__________________
fstbttms is offline   Reply With Quote
Old 19-02-2016, 11:21   #8
Moderator
 
Paul Elliott's Avatar

Cruisers Forum Supporter

Join Date: Sep 2006
Posts: 3,866
Images: 4
Re: Solar an Zincs

Quote:
Originally Posted by fstbttms View Post
Galvanic corrosion is absolutely one of types of corrosion that zinc anodes provide protection from, and therefore would cause anode depletion. But you are right; without some other underlying problem, a solar charging system should have no effect on anode wastage.
What I was trying to say is that galvanic corrosion between the aluminum panel frame and the stainless mounting hardware will not affect the zincs, since it is contained between the panel and the mount.

Yes of course galvanic corrosion between differing underwater metals can deplete the zincs and erode props, through-hulls, etc., as can shore power ground issues.
__________________
Paul Elliott, S/V VALIS - Pacific Seacraft 44 #16 - Friday Harbor, WA
www.sailvalis.com
Paul Elliott is online now   Reply With Quote
Old 19-02-2016, 11:48   #9
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Re: Solar an Zincs

Quote:
Originally Posted by Paul Elliott View Post
What I was trying to say is that galvanic corrosion between the aluminum panel frame and the stainless mounting hardware will not affect the zincs, since it is contained between the panel and the mount.
Roger that. Just trying to clarify for those among us who consider "electrolysis" (which is a misused term when discussing metal corrosion in boats) to be the only reason we install anodes to protect against.
__________________

__________________
fstbttms is offline   Reply With Quote
Reply

Tags
solar

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
Zincs and the 'Hot' Marina Pura Vida Electrical: Batteries, Generators & Solar 62 14-06-2009 09:40
Putting New Zincs on a Steel Boat - How to do it? ssullivan Construction, Maintenance & Refit 9 11-08-2007 19:47
Taking on water----Zincs Tropic Cat Construction, Maintenance & Refit 14 22-07-2007 07:23
Yanmar Engine Zincs Strygaldwir Engines and Propulsion Systems 9 15-02-2005 11:55



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 20:32.


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.