Isolation Transformer in Mexico

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Auto isolation transformer boosting an already high voltage

I have a Victron system on my sailboat that includes an auto switching isolation transformer. The boat is a 230V/50Hz boat. Power is coming into the shore power connecter at 127V, being doubled, plus the extra 5% provided by the isolation transformer, to become 267V. The voltage is briefly observed to be over 270V by our dual Multiplus configuration, so the switch-over to shore power does not happen. While the intent of boosting 5% is a excellent solution in a lot of cases, it is a killer in…