growing in greenhouse without a power source?

over the years I have ran in to various problems from growing outdoors, and from my research a greenhouse could help prevent most of these issues.

the only thing is where I grow does not have a source of power anywhere nearby.

this will be a problem with ventilation and air circulation since there is no power to run fans, everything else should be okay.

im fairly sure even if the plants are a little weaker from the lack of wind, I can tie the branches up during flowering, does anyone see a problem with this?

my second question is without an exhaust fan would there be any other way to circulate the air? like would leaving a few small openings do the trick, and not mess up the improved environment?

does anyone know if their is some sort of sustained small power generator that I could just run an exhaust fan and maybe a circulating fan off of without having to use the gas of a normal high power generator?

generators are used the world round for this ... but without supp. heat its a coldframe/ hoopstructure not a true ghouse.
there are solar fans and ect to solve most of those problems if you got money to throw at the problem...
there are "cattapiller hoophouses" that have rope holding the plastic down thru eyehooks in the baseboard. then you can raise the plastic on the sides for ventilation.
if your hooper is more than 2X its length you need side vents or ridge vents...study proves...