on or off.... not rocket science
Ok, this subject has come up so many times that I feel I must scream aloud..... LEAVE IT ON. When we leave our homes for vacation, etc. the fridge stays on. There is no differance with your 12VDC boat fridge. In most cases they run cooler than a 110 vac home fridge so will last longer regardless. (forced air cooling vs. static cooling.) Plus, added benefits include: lower run times when initially boarding for the weekend, 2 week cruise, etc., ability to leave condiments and other perishables on board, lower overall current draw, and a frosty brew or cocktail after the long ride to the marina!