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Isolation Tranformer

Isolation Transformer 3600 Fan

If the cooling fan is operating when shore power is disconnected does the fan stop? If not where is it powered from.

Thank you

John Siggs asked

0 Answers

Isolation transformer earth connection

Hi all,

Just confirming here that when my boat is floating on the water there should be a link from the input PE terminal to J34a.

So, the earth wire from the shore power supply flex is connected to the input PE terminal and I make a small wire up with a female spade connector from this input PE terminal and connect it to J34a?

This transformer is not the auto 115v - 230v switching model

Many thanks

metal-snapper asked
cardy01 edited ·

8 Answers

Isolation Transformer cooling fan broken?

How can I tell if my 3600W Isolation Transformer’s cooling fan is working? I have never seen it on, even when the unit is obviously hot and running near max load for some time. It’s a 5 year old unit and I’ve been using it for several months now.

I read that the transformer should shut down if it overheats, but fortunately that hasn’t happened either.

kdagley asked
wanderer answered ·

3 Answers

Welding a vessel on water

Hi Guys,

Just wondering if anyone could help answer my following concern.

I want to do some welding repairs on my steel boat (She is using shore power in a marina in Aust), I'm concerned about stray current damaging my boat (and others nearby).

Can someone tell me if it is safe to weld using sore power via isolation transformer, the theory/concept behind why, and anything/indications to watch out for ?

I thought there was a description about welding in one of the Victron publications but I cannot find it...

Kind Regards


brynwatson asked
Paul B answered ·

1 Answer

Are the Isolation Schematics on the Victron Website Wrong?

This question has been asked before (@Charmcityboater) but not really answered:

It seems like the Victron diagrams below show the Multiplus BEFORE the Isolation Transformer in the chain from shore power to loads? I thought that the isolation transformer would be the first and only thing directly connecting to shore power and the multiplus would connect to the Isolation Transformer?


msg43 asked
wkirby answered ·

1 Answer

Isolation Transformer buzzing on electric heated blanket

Hello All, very confused. Victron I.T 3600w 115/230v on a boat connected to shorepower. Very happy and (almost) quitly doing its thing until i plug in the electrical heating blanket. The buzzing is too much and changes with the setting of the heating from low = annoying to high = unbearable. The blanket is an Inventum HN1312V with a draw of 60w. Very curious why this is and if there is a way to still be warm at night and being able to sleep.

goyow asked
Alexandra answered ·

1 Answer

Is it possible to put 230v via a switch directly between transformer output and multiplus input


I would like to use an isolation transformer to convert from 120v to 230v.

Is it possible to put 230v via a switch directly between transformer output and multiplus input like in the picture?

What if 120v is connected on the 230v output side because the switch position is wrong. Will the transformer and the Multiplus switch off or will there be damage?

Exactly the same question what happens if the input voltage is bridged differently than actually present?

This is unfortunately not described in the manual


service-1 asked
Mike Dorsett answered ·

1 Answer

3600W output Isolation step up voltage incorrect, possible failure?

Hello I currently have a Victron 3600W 115v/230v(not auto)isolation transformer. I have the jumper above the inputs set properly for 115v In(measured: L-120v/N-0v/PE-0v) and I have the output jumper set correctly(middle two spades) for 230v output but the output voltage is messured: L-77v/N-65v/PE-0v which makes no sense to me at all. If any one has a suggestion as to what may be causing this I would greatly appreciate it.


Image Caption


I do not have the J33 and J21 jumpered, will this make a difference?

miller76 asked
wkirby answered ·

1 Answer

Isolation Transformer fan operation

We have an ITR3600 auto transformer.

Recently, the temperature light has illuminated, the unit is still passing power, but the fan is not operational.

Does anyone with experience with this unit know if the fan always runs at variable speed, or is it sometimes off during operation?

Have hooked up a replacement fan, which is behaving the same way, though I have been unable to reproduce the temperature light.

Should it be running during operation, energ without the temperature light?

Attempting to troubleshoot and rule out a thermostat or other internal error vs fan failure.

kelzamedic asked
mike4nl answered ·

1 Answer

Isolation transformer high output voltage

I have an automatic isolation transformer that I am supplying with 120VAC input.

I’ve set the output voltage to 230VAC via the jumper settings provided in the manual but I am seeing 260VAC output.

What am I missing?

rspott asked
Rod answered ·

3 Answers

3600 transformer connector question - J34 to J34A

Hello. Please could anyone help with my 3600 transformer connector question - wire from J34 to J34A.

5 years ago I purchased a steel narrowboat and asked a electrician to fit a Victron Transformer 3600 when floating in water. After 5 years with the steel boat in water, the Victron 3600 case was removed and saw that the wire (green yellow) was connected from J34 to J34A.

When the boat is in water should this be?

Connect PE to J34A
Remove J34 to J34A

I have attached a link to the manual - Page 7

I am hoping the electrician has not made a mistake.
Could be my boat has not been protected for many years. Does it still protect the boat with the J34 to J34A connected when in water and is it just a safety feature when on land?

I appreciate any help on this.

mark-hawkins asked
mark-hawkins answered ·

2 Answers

Is the input of a Phoenix C 24/2000 isolated from the output?

I currently have 2 batteries connected by a non-isolated DC-DC converter. Battery A is feeding a Phoenix 24/2000 which is feeding a Multiplus via an isolation transformer, which is in turn charging battery B. Odd I know, but works fine.

My question is, if I remove the isolation transformer from the circuit, would I create a ground loop? Or are the input and output of the Phoenix inverter suitably isolated anyway?

andyrlm asked
andyrlm commented ·

0 Answers

Noisy isolation transformer

I have a Victron 3600VA 115/240V isolation transformer finally installed to our yacht about an year ago. At first it was fine but during the last sailing season it became more and more noisy - so intencive that no one was able to sleep in that cabin. It was a mild disappointment as I’ve been happily using Victron stuff in my yachts already from the 80’ies. But, I’m a handyman and able to tear it down and rebuild it. (I’m not interested in sending it from Finland to Netherlands for repair as it is so heavy and dont have the original cardboard box anymore. Silly me).

The sharp loud metallic resonating noise at 50Hz starts immediately and always when connected to shorepower at different questharbours. The transformer is in my homelab right now and before tearing it to pieces I kindly ask Your idea before my next moves with it!

thank You in advance,

IHe, M.Sc


finihen asked
finihen answered ·

5 Answers

Isolation Transformer Frequency Conversion 230V (50Hz) <=> 115V (60Hz)

I understand that the isolation transformer can convert the voltages, but does it also alter the frequency? For example 230V (50Hz) to 120V (60Hz)? This one is important because the frequency will affect my devices that require 60Hz if they are getting 50Hz.

If the isolation transformer does not change the frequency, what can I use to change the frequency?

ftlsailor asked
sebastianlehmann answered ·

3 Answers


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