Originally Posted by john61ct
Better if your 'space filler' material has thermal mass.
Water/ice being the cheapest and most useful example.
Buffers the cycling, acts as cheap
, reduces AH per day consumption
The lightweight examples above not so much, but better than nothing I suppose.
One thing that dramatically improved our refridgeration in both quality and energy consumption was to add a second fridge.
The original fridge is a front loading standard unit. Opened & closed too often to get at cold drinks during the day, and in the evening it was even worse for the beer
If I added warm beer
in the evening the fridge consumed tons of precious battery
power. If I added too much warm beer the temperature would go way too high for hours.
The fridge had to work
hard to cool down the drinks, and would create thick ice on the coldplate from condensation
so required defrosting often (read: amp hours and unhappy wife).
So what to do?
The Lagoon 380
S2 comes standard with a large toploading insulated box under one cockpit
seat. A danfoss fridge unit fits nicely in an empty space under the cooktop and the coolplate in box. I wired it to one of our solar
chargers so it runs on excess solar
That outside fridge has lots of thermal mass, as it typically contains a few boxes of beer and some water. It starts when there is surplus solar power, and runs continously until the sun goes down or the beer is about to freeze.
The result: drinks are ok in the morning, cold during the day, ice cold in the evening. I can restock drinks whenever I want, and they get cooled down as soon as there is sun. There is no food to go bad in case i restock too much beer at once.
And there is no power draw on the batteries
because it only runs when there is too much solar power.
Now the original fridge is opened only a few times per day for food, consumes much less amphours than before especially at night, has much better temperature stability, and does no longer need frequent defrosting.
Now its the admiral's fridge.
The skipper's fridge has only one drawback: Its under the skipper's seat, so I have to get up to lift
seat and get another beer.