Well, thanks a lot everybody for your help. Actually I'll need to have heavy power for both water pumps and freezers, but I can accept to use diesel when solar not strong enough, or maybe have only a part of equipments on solar. Concerning wind turbine, I have no information on the wind strength and stability yet, but I'll keep it as an option.
Skippy you're true, efficiency of equipement has to be carefully checked. Biofuel or even vegetable oil could be an other solution, or part of the solution... Is there any local oil production that could feet ? Sunflower oil works great but I'm not very informed on other types...
Thanks again!
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