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Galvanic isolator

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Swanji View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Swanji Quote  Post ReplyReply Direct Link To This Post Posted: 25 April 2012 at 19:32
Hi Brufan

There is nothing wrong with your memory that is for sure - it is exactly there! But unfortunately there is no zinc saver next to it which means that we will need to fit one.

Is this easily connected in the correct way or do we need to call in the cavalry so to speak? It looks easy enough from DavidBB's image.
Onwards and upwards

Nidri, Levkada, Ionian, Greece

Hanse 350 #7, SY Evolution, standard keel, 3YM20 sail drive, 3 cabins, cherry wood interior, teak decks, feathering prop
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Brufan Quote  Post ReplyReply Direct Link To This Post Posted: 26 April 2012 at 12:08
It is indeed very easy to fit.  Just two wires, one from the AC input socket, the second to the AC Breaker box
Bruno

hanse 355 - 57

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Post Options Post Options   Thanks (0) Thanks(0)   Quote H8jer Quote  Post ReplyReply Direct Link To This Post Posted: 26 April 2012 at 13:48
Att. Bjoris

There is an cheap alternativ to the Stirling zinksaver from Biltema.


This is only relevant for people living in Scandinavia...
Hanse 370#487 30HP 3-cabin
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Post Options Post Options   Thanks (0) Thanks(0)   Quote skipper Quote  Post ReplyReply Direct Link To This Post Posted: 30 April 2012 at 22:38
One region on earth that the zinksaver doesn't work is in Scandinavia so I wouldn't recommend it for a Swede even if he/she is close to the shop:-)
 
(Zinksaver protects up to 2 Volts differenance and in Sweden the difference can be up to 20-25 Volts, source Sterky author of an installationguide of el.system in Swedish boats
http://www.google.se/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=4&ved=0CDoQFjAD&url=http%3A%2F%2Fbatteknik.se%2F2010%2F13297_foredrag.pdf&ei=lQafT9fJEIvTsgarzZV7&usg=AFQjCNEAvpjE_XFpSJQuApAAhdycOEnb8g&sig2=w9RNcRJAvg927kAEdBAozQ.)
 


Edited by skipper - 30 April 2012 at 22:44
Cheers,
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Former owner of Hanse 342 2005 (Sparcraft mast, white hull, wheel steering, deep draft keel, short rudder)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote H8jer Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 2012 at 09:41
hey Skipper

//If I understand the Swedish document correctly you should ideally have a 3-phase isolating transformer.
There is approx. 20-25 volts on the ground wire in Sweden, while a zinc saver can only handle up to 2 volts.//

Is this specific to Sweden? The document indicates that the power plants are located on mountains.
In Denmark our 240v is supplied with a relay cutting the power if there is above 30mA on the Ground wire.
One should perhaps take good volt meter and measure voltage between ground wire from shore power and Saildrive leg.

If the voltage is less than 2 volts, a zinc saver can be used.
But if the voltage 20-25 volts one would want a 3-phase isolating transformer?

/H8jer


Edited by H8jer - 01 May 2012 at 09:47
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panos View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote panos Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 2012 at 12:59
Lucky Swede's

They can use a step-up transformer and convert the 20v neutral to ground voltage to 240v, and enjoy free electricity.

This voltage can be at the grid high voltage powerlines (400,000V) but 100% it is eliminated by suitable transformers at the distribution level (20KV or 400V). A 2-5V neutral to ground is only tolerated in factories and other large consumers, such as a marina!

The use of a transformer is theoretically useful but also presents problems and dangers: it is heavy to keep on board, it is subject to severe rusting if kept at the pear, is very expensive and if by rusting develops a sort it stays unnoticed until it eats up all anodes and thru hulls or an innocent swimmer is electrocuted (if he tries to climb on board touching the guard rails).

I prefer a separation set of diodes! One can use more diodes in series to build up a 5 or 10V protection! Each diode has a 0.7V protection gap.

Edited by panos - 01 May 2012 at 13:12
Panos

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Post Options Post Options   Thanks (0) Thanks(0)   Quote H8jer Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 2012 at 17:02
Hi Panos

As always, you have good knowledge on issues about current and voltage!

Is a little confused here.
Is the current between the "ground wire in the shore power" and "water" - that is the problem? (water = Saildrive).
or
Is it current between "ground wire" and "neutral wire (N)" which then sends power back to the water which is a problem?

Should a zincsaver sit on the ground wire or should you also have a zincsaver at the neutral wire?
A zincsaver at the Neutral wire - will it not destroy the sine curve?

Anyway - I will try to measure the currents in my marina.

/h8jer

Hanse 370#487 30HP 3-cabin
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Flemming_M View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Flemming_M Quote  Post ReplyReply Direct Link To This Post Posted: 04 June 2012 at 17:50
Hello. I have some galvanic corrosion on the propell.  There is a Sterling Zink saver but perhaps it is better with a real galvanic transformer eg. Victron 3600 W.
Flemming M

Hanse 350/DEN233
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Post Options Post Options   Thanks (0) Thanks(0)   Quote skipper Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2012 at 07:44
Hi Fleming,
 
based on your first name and possible number from the sail could you be sailing in Denmark....
 
In the Scandinavian countries do we have similar bedrock which could give a higher voltage potential so a "Zinc Zaver" doesn't protect our boats.
I must admit I have been looking for an Isolation Transformer that could provide the warm water heater only just to limit the weight and cost but so far have I only found transformers with higher capacity for around 1400 Euro.
 

I do believe a one phase isolation transformer is needed in our region of the world and the transformer with less weight I have seen is 6 kg (12lb) Mastervolt GI 3.5

Victron Energy ITV 2.0 MT weight 10 kg (22 lb)
Victron transformers can be used as:
115 V to 115 V isolation transformer
230 V to 230 V isolation transformer
115 V to 230 V isolation transformer
230 V to 115 V isolation transformer

http://www.victronenergy.com/

 
Mastervolt GI 3.5, in 90-255 V, out 90-255 V, weight 6 kg, efficiency   >93%, max power 3 500 W
 

 



Edited by skipper - 02 November 2012 at 12:45
Cheers,
Skipper
Former owner of Hanse 342 2005 (Sparcraft mast, white hull, wheel steering, deep draft keel, short rudder)
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NK1 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NK1 Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2022 at 23:09
Does anyone know if the isolator is Sterling 16A Pro Save A or Sterling 30A Pro Save A? Thanks. 
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