Plugin electrical facilities are usually available for refrigerated vehicles on board ferries. These tend to be 440V and 60 Hz, but it can vary depending on the ferry operator.
For example, on Stena Line it must be 440v and 60Hz. If you have something different, this must be mentioned as there is a limited amount of transformers.
We would suggest you contact our customer service team before booking if you are unsure of your requirements and the availability on board. It may also be useful to carry the appropriate converter.