Stovie, i'm a little confused (and intrigued) by this 'friction heater' and 'gravity motor' arrangement you speak of...are claiming perpetual energy, or do you mean that you've found a way to harness energy that would normally be wasted? If you're still in the experimental stages-or if you think further discussion would end in Thread derail-fell free to PM....
You mention that your main source of power is going to be wood-if that's the case I recommend doing lots of dehydration and smoking, My Grandparents were Great Depression babies and didn't have electricity until the late 1950's, and canning/pickling (on a wood stove) salt-curing, and dehydrating (via the low-tech option of a tin roof and protective cheesecloth) were the order of the day. For refrigeration they stuck eggs, wrapped butter, fresh meats and veggies in moisture-resistant wax paper or oilskin, placed in boxes and suspended the boxes in the well about 5 feet above the water-ice was
expensive!
They didn't have a freezer until about 1965 or so...since they lived to the age of 90 (Granddad) and 91 (Grandma) respectively, I doubt their diet was terribly unhealthy for them...
I've been doing a little room-temp pickling recently-nothing fancy, just a 50/50 mix of cider vinegar and water with a half-tablespoon of salt, no canning or vacuum packing or canning...i'm keeping most of them in my tiny RV fridge but I have one jar as a 'control' sitting in my cupboard at 79-85 F for two months now, and so far the acidity alone has kept them fresh-I have of course made sure that the veggies are fully covered by the solution at all times. Haven't had the guts to try fermented (brining) pickles yet though...