Galvanic Transformer ?

[Roz]

Can any one help please, I have been told that what I need is a Galvanic Transformer. Its for my 41ft Rodman 1250 yet I cannot seem to find anywhere selling them.

 

[jimmy_the_builder]

Try googling for either a galvanic isolator - or an isolating transformer. Two different things. Good luck.

Cheers
Jimmy

 

[Geoffs]

Would normally used a Galvanic Isolator to provide DC isolation from your shore power, to cut down on corrosion.

Example here

Other chandleries are available /forums/images/graemlins/smile.gif

You could use a transformer for isolation, but this would need to be quite large and expensive, and would have come from a spcialist transformer supplier.

 

[sealine]

I would have thought that one would have been fitted as standard? given the size of your boat. They are on sealines, my S28 has one, so are you sure you do not have one, but not aware of it?

 

[VicS]

Galvanic isolator fitted in the earth connection of your shorepower installation to block current from low voltage sources that causes corrosion of your underwater bits and pieces if you leave the boat with shore power connected (not necessarily in use) but allows current from high voltage sources eg the mains, to pass maintaining the safety aspects of the earth connection.

A couple of items worth reading under "galvanic isolator" in the Yandina catalogue

Regularly been discussed on the Reader to Reader forum but if you read those two items you'll know all you need to know!

 

[tcm]

jeez a glvanic transafomer is a big thing, and mite cost at least a grand. I had one from mastervolt cost 1600 euros.

i would have thort you need a galvanic isolator. This costs less than 100 quid and isolates you from the common earth and dramatically reduces anode consumption yet still allowing those things to protect underwater metalwork.

Now the reason i had a isolation transformer (on another boat from the galvanic isolator) is that i asked for an galvanic isolator but they offered an isolaton transformer, and then a friend sed ooh hoo so i bought it. But first time the shorepower was dicky the isolation transfomer went bang so i shorted across it, and then threw it away.

 

[TonyJones]

AFAIK isolation transformers are considered superior to galvanic isolators because when the latter fail, they fail 'closed' in order to maintain the earth between the boat and ground. Thing is, there's no indication of the failure. So there you are thinking you're corrosion protected and you're not. But I am NOT and expert.

Best wishes
Tony

 

[Garryt]

I had to fit one to my F43 as it wasn't fitted as standard!

 

[tcm]

yep, though if you google for them, often a galvanic isolator has a little test feature whereby you put a 9v battery across it and a light comes on, or not.

Isolation transformr nuther whole big deal, perfick sinusoidal whatnot polarity perfection blah etc. But as i said, i gotr one with the aim ofhaving trouble-free shorepower, and when it went bang it rather defated the object. So, there's a free one at the bottom of the sea about 500 miles west of portugal.

 

[Elessar]

I moved to Shamrock Quay about a month ago and the anodes have been eaten away in that time.

I fitted this galvanic isolator yesterday as my Sealine didn't have one I hope it solves the problem.......

Service from these people on ebay was overnight and the isolator with warning lights is only £90 so they are recommended.