HarryN
Solar Enthusiast
In response to the comments about temperature, it is usually above 0 degrees Celcius. But, in cold winters with little snow, we have experienced that the water we store in the same cellar have frozen. However, if we place the containers with as much surface area as possible in contact with the ground, the water does not freeze.
Thanks for that info. It is an "indication" that if you have the batteries in direct contact with the floor, and a cover over them - such as a drink cooler to insulate them from the air - it might just work.
Any easy test would be to put some water jugs in the basement in a drink cooler - with the bottom cut out.
If possible a thermometer to look at actual temperatures once in a while and see if it stays at 5 - 10 C.