Wow! That's a hard question to answer, but I'll do my best. It really depends on several factors:The durability of the materials used to make your solar cookerWhether those materials hold up to moisture, heat, coldHow well constructed the cooker isIf you made your solar cooker, and used aluminum foil and cardboard, don't expect it to last more than a season or two. However, if you made your solar cooker out of heavy duty materials, made sure it was well constructed, temperature and moisture resistant, it should last a few years at least. Some commercial solar ovens can be expected to last up to twenty years depending on how well you care for it. Keeping your solar cooker clean and serviceable will help it last the longest time possible.
How much does wind affect my solar cooker?
If you mean, will wind affect the cooking temperature, the answer is yes, and no. Depending on the type of cooker you use, the reflectors, and the exposure to the wind, solar cooking temperatures are generally not affected very much.
However, I have had my solar oven blow off of the card table I had it sitting on due to a wind gust. Think of the reflectors on your box type oven as sails and prepare for that. The answer for me is to tie down the solar cooker to the card table or secure it to the ground. Wind will also bounce the reflectors around some but will not affect the amount of light coming into the cooking chamber.
Secure your solar cooker on the ground using whatever method you find that works the best while not hindering your ability to turn the solar cooker as needed.
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