Refrigeration
My motorhome has a gas powered fridge freezer. I am a bit suspicious regarding how much gas it actually uses. If I get a glut of produce I turn the fridge on and try and eat or preserve it ASAP and then turn the fridge off. I store milk in a terracotta wine cooler. This takes me back to my school days. It works by evaporating water from the terracotta cylinder. If you use an evaporation refrigerator you should remember that it does not keep the temperature at a constant 4 centigrade like a fridge. It just reduces the temperature by about 10 Centigrade maximum. They should be stood in a shaded but draughty place to aid evaporation.
Beware , some terracotta wine coolers are for decoration only. If the water level is not going down there has been no evaporation and it is just for keeping utensils in.
Bigger versions have been developed for use in Africa. It involves a large terracotta pot standing in a saucer of water. A bowl is inside the pot with the space filled by sand.
www.wikihow.com/Make-a-Pot-in-a-Pot-Refrigerator
Being unable to have a nice big chest freezer is the worst aspect of living off grid for me . The Amish people believe that electricity is the work of the devil and have developed a gas powered chest freezer . Only $2,000 . Ouch !
There are a selection of 12 volt freezers available online. You can find these by googling “dc refrigeration uk" . Do be careful of the sales people. They seem to try and take advantage or your ignorance by selling you a “kit" IE everything including “special" batteries.
I am trying to develop chest freezer that only runs during the day and “stores the coldness" in eutectic solution rather batteries . If you want to be updated as to my progress drop me an email at : cestrianpimpernel@gmail.com .