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How to make solar power ventilator?

I am planning to construct a solar power ventilator. But before making it I have quite a bit queries. If I use only one 12 volt DC solar panel, how many fans would I be able to operate? Is there any need of battery and a charge controller? What can be done with DC input? Also tell me what to do with the set up of whole system while making solar power ventilator? I would really appreciate an early response. Thanks.