Just a message to try and clarify the seemingly ongoing debate over what's involved in refrigeration
First of all, the word eutectic
is used to describe the joining of more than one substance and have it change from solid to liquid (state) at a temperature that is consistent throughout.
In other words a good example is solder. Solder can be a mix of Lead, Tin, Silver and various other stuff. The precise mix of these substances enables a melting point that is not actually the melting point of any one of the elements that make up the compound of solder. It's an observed physical property that's been seen to work and probably can't be calculated without the "The Big Bang Theory"
. And it should do it consistently. At the same temperature every time. The root of Eutectic
is from the Greek Eu
meaning the same.
Anyway, the story here is refrigeration
The good reason for Eutectic/Holding plates is based on the fact they, in of themselves, require to get good and cold before the thermostat tells the compressor
to shut down. In other words it's like freezing a bunch of bottles of water
and sticking them your icebox
because they're already pretty darn cold. And, as a result, keep everything else cold as well.
A good Eutectic/Holding tank system requires that the cold cycle of the refrigeration continues until the Eutectic/Holding tank is properly cold before it's shut down and it's done while the system--solar, engine
, shore power--is available and doesn't cycle constantly like a normal fridge does. In other words "Make hay while the sun shines" . "Save the batteries" is the key. So what you're really doing is freezing a good old block of ice when the power is available. Otherwise it's just a normal fridge and gets cold when it needs to and keeps cycling.
So that's it, in all of it's simplicity---AND-
A disclaimer. I think that the use of the word "Eutectic" is a a bit of a stretch. The solution used to hold the cold in the evaporator is usually antifreeze
. It does have a eutectic property and I suppose that's a good marketing
reason but as far as I'm concerned they are still "Holding Plates". But just the same, the principal is correct.
USE THE POWER WHEN IT'S AVAILABLE.