At a minimum you will need an adapter. If your equipment (particularly battery charger) doesn't accept 220V you will also need a transformer. If your equipment can't accept 50 Hz (vice US 60 Hz) you can't plug in.
If you get your boat set up for Europe you will be fine in the Azores.
I recall availability of 16A 220V 50Hz at all the slips. I don't remember it being available on the bulkhead but I was rafted out until a slip was available so I may have simply not noticed. I don't remember seeing 30A outlets but I wasn't looking.
You can buy small transformers at Mid-Atlantic Yacht Services in Horta but they are limited. If you really have a 50A boat I would consider sourcing a built-in transformer before you leave and buying the appropriate pigtails in Horta. Even so you may find yourself a bit more limited in the Azores and Europe than when at the dock in the US.
sail fast and eat well, dave
beware "cut and paste" sailors.
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