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
? 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
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.