Re: [Amel Yacht Owners] electrical leak in mass circuit


Andrew & Kate Lamb
 

I thought the point was that a galvanic isolator  or isolation transformer prevented any stray currents setting up a circuit through the water to earth on shore and back through the earth lead to your boat through the AC connection, thus preventing galvanic corrosion. The additional advantage of an isolation transformer being it provides an isolated circuit for any stray currents to return to the AC source directly (the boat side of the transformer) without ever leaving the boat.

Andrew SM472 Ronpische

On 30 Aug 2014, at 01:40, "Alexandre Uster von Baar uster@... [amelyachtowners]" <amelyachtowners@...> wrote:

 

Hello Kent,

This is what I thought about the galvanic isolator only prevents from the "other" boats.

Interesting you mentioned the battery charger, as I just replaced my Dolphin 50 AMP that died with a new Dolphin.
And this is since I noted the electrical leak.
What model of battery charger did you installed?

Next weekend, I will remove the battery charger I installed and see if this is still the cause.
That is as well the only electrical component I changed.

Sincerely, Alexandre

--------------------------------------------
On Fri, 8/29/14, Kent Robertson karkauai@... [amelyachtowners] <amelyachtowners@...> wrote:

Subject: Re: [Amel Yacht Owners] electrical leak in mass circuit
To: "amelyachtowners@..." <amelyachtowners@...>
Date: Friday, August 29, 2014, 3:06 PM


 









My understanding is that galvanic isolator
a protect you from stray currents at the dock or from other
boats, but not from stray currents generated on your boat.
 They work because the shore power ground is shared by all
oats on the dock.  Is that correct?
I still haven't chased down the
cause of electrolytic damage to my prop shaft, but the
marina has checked all their docks and found no problems.
 I suspect that the new chargers I had installed 1 1/2
years ago are going to be the culprit, as that's the
only electrical thing that's been
changed.I'll let you all know what I find
when I get Kristy back in the
water.KentSM243Fernandina
Beach FL

Sent from my
iPhone
On Aug 29,
2014, at 4:55 AM, "'Anne and John Hollamby ' annejohnholl@...
[amelyachtowners]" <amelyachtowners@...>
wrote:
















 










Hello Alex,
I suggest that you look it up on Google
and then employ a
marine electrician to fit one.You are running the risk of
stray
electricity  causing severe damage through galvanic
corrosion similar to
that which caused Kent Robertson to remove the C-drive from
his boat and send it
back to France to be fixed thus losing the use of his boat
for a season and
incurring huge costs. The actual device is not very
expensive as it only
comprises some diodes and capacitors.
 
                     
Anne and John, Bali Hai, 
SM319               
for sale in Malta 


 

From: mailto:amelyachtowners@...


Sent: Thursday, August 28, 2014 9:38 PM
To: amelyachtowners@...


Subject: RE: [Amel Yacht Owners] electrical leak
in mass
circuit
 
 


I am not familiar with galvanic isolator...

Could that be that the
ground strap is no longer connected to the bottom of the
bilge?

--------------------------------------------
On Thu, 8/28/14,
eric kimberlite@...
[amelyachtowners]
<amelyachtowners@...>
wrote:

Subject: RE: [Amel
Yacht
Owners] electrical leak in mass circuit
To:
amelyachtowners@...
Date: Thursday, August 28, 2014, 2:32
PM


 









Alaxandre,Does this
also happen when you
are at sea?Possibly you
are getting some
stray
electric from another boat,. also have
you installed
a
galvanic  isolator?Eric    On
Thu, Aug 28, 2014 at
03:26 PM, Alexandre Uster von Baar
uster@...

[amelyachtowners]
wrote: 

 











On the companionway, I
have the "Mass Circuit and
electrolysis
protection".

When I
push
toward the right (negative): no light.

When I push toward the left
(positive): right light goes
on.

here are some
pictures:

http://nikimat.com/mass_circuit_electrolysis_protection.html



I
did not find any explanation on the English owner manual,
but find some in
the French one.



Here is what it says:



It says:
All the equipment in contact with water (pump,
engine, hoses, transmission,
propeller, toilet, back water
tank, etc.)
are connected together and made a
circuit.
isolated from the other electric
cable, but connected to the
zinc
anodes on the rudder.



This installation
(green/yellow cable) is
made to protect
these equipment against
electrolysis. The anodes will
break
up and not the equipments.



A leak detector is in the
companionway, it allow to research
the
electricity leaks on the electric
circuit inside the
boat (but not on the
masts).



To use: push
the switch toward "Mass +" if the
light goes on, it means the mass connected
to the positive
circuit of the boat.

If nothing light push toward
"Mass -" if the
light goes on, it
means the mass is connected to
the
negative circuit of the boat.



If a light goes on, it is
important to find the location of
the
electrical leak and solve it.




How do I do that?



After a year,
95% in marina, I
recently changed the
Anode/Zinc on the
rudder, they needed to be changed, but
was
still some left.



The only new
equipment I added is the
new battery charger.




Thanks in
advance, sincerely,
Alexandre

SM2K #289
NIKIMAT

Bay Street Marina,
Nassau, The Bahamas























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