Hi Ray and welcome to the forum.
First heed any advise from Richard. He wrote the book (literally) on
marine refrigeration. However I would add a bit.
First, from your question I'm guessing the
current holding plate system runs from an
engine mounted
compressor? If so I'll guess the reason for the inquiry is to reduce
engine running time and not because the
current system isn't working?
Before making any changes in the mechanics I would first consider the condition of the box and
insulation. Not familiar with how
Beneteau does in this regard but a well insulated box needs a good 4" around a
fridge and 6" around a
freezer unless the box was built with vacuum
panels or some other high tech solution. Also, if the old
insulation is spray in foam it could have absorbed moisture over time and
lost its effectiveness.
If the box is good and the old system is working and you have the room, installing a second electrically powered system sounds like a good option. Be aware, as Richard referred to when he mentioned your onboard DC
electrical grid, that you will need to have sufficient
battery reserves and
charging capability to keep an
electric fridge running. Depending on the size of the box, fridge and/or
freezer, and quality of insulation and
seals that could be 20-30 up to 50-60 amp hours per day.
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