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I have a 30wp solar panel which charges a 28amp 12 V dc battery. Can I use an ac fan (with less power) on that battery? I am newbie to electronics.

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Most AC fans have induction motors and as such won't work on DC. You will most likely need an inverter, to convert from 12VDC to the AC voltage that fan requires.

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Thank you for the reply. Would you recommend an inventor for my situation and a small fan for max performance and max running time for this 28amp battery? –  Rizwan Sep 1 at 6:35
    
Normally I would look for some cheap device sold on eBay. However, I doubt you will find a cheap 12VDC to 12VAC inverter - they are generally 12DC to mains AC. Maybe a mains rated fan? You will also need to factor in the losses due to inefficient conversion –  user32885 Sep 1 at 7:44
    
@Rizwan why not look for a PC fan, they are DC fans and you should only need a voltage regulator to get the 12V to what it needs –  ratchet freak Sep 1 at 8:36
    
@Ratchetfreak:It might be a bit noisy but you should be able to get away with a PC fan or other 12V fan off a 12V nominal battery (e.g. a car battery). A simple DC motor can handle quite a bit of over/under voltage (from what I've used in the past a PC fan can run from 7V and doesn't burn out in a hurry at 15V). Alternatively a PC variable fan speed control might be a nice addition or a couple of small power diodes in series to drop the voltage. –  Chris H Sep 1 at 8:53
    
Will they give enough air for single person on a cabin? I was looking for something like this: i00.i.aliimg.com/photo/v3/243107702/dc_fan_12v_24v_WIN_101.jpg –  Rizwan Sep 1 at 8:56

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