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Isolation transformer how to swap coils

Hello everyone,

I have 3600w Victron Isolation transformer on my boat. Output is set for 230 volts. However most of the times the output is way higher sometimes even 270 volts. It is my understanding that this normal behavior the transformer will transform the input power by factor 1.05 to compensate for loss. My problem is that most marinas have over voltage, so power comes in at 248 volt for instance. I read a post that you can remedy this problem by swapping the coils of the transformer. The output one has a few more windings that the input. Does someone know how to do this? Can I just swap the input and output wires?

Isolation Tranformer
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