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Picture of Solar Powered Sausage Cooker
Easy build for a solar powered cooker.

Step 1:

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Take a Pringles can and puncture the middle of the lid with a skewer. 
 
No 140 is way to low. Slow cooker even on low will boil even if just around the edge. Slow cooker is misleading as the temp is high, slow cooker means longer cooking times not low temps. Even when you "cold" smoke something the smoke temp is 90 to 120 but the meats been cures with salt and sometimes nitrates to prevent mold and bacterial growth and tou still have to cook it to bring the temp up to safe range. My slow cooker even on 10 hours simmers pretty hard and on 6 hours boils. There are solar cookers that are called Cajun ovens and we used a old stadium light cases with a sheet of glass over them to create a oven that you could burn something in. In solar oven its all about how the light is reflected, kind of like a microwave they cook from the inside out. But anyways kinda long winded i just got off of a 12 shift. but I hope you get the point if your going to make one use better materials and glass to create more heat. A case of food poison or dysentery is no joke. But in a pinch like survival it would work . Have a great day.
Wow have fun with the runs after you eat it. It doesn't matter pre cooked or not that slow of a temp rise is going to allow bacterial growth. Yes I know I am a 25 year cook and a health dept inspector.
Would the temperature inside not rise above 60 to 70°C? I am no expert, but is that not the temperature used for slow cooking? What temperature would you deem safe?
Hey quick question wanna give up on life an live in a tree house with wifi?

(Jk)