Ok, I've managed to build a classic Figjam-style bucket cooler that has been happily running for the last few days via a 30 watt solar panel
I used one of the pumps mentioned in the other thread (lightobject 3.8L 12V Mini DC submersible):http://www.amazon.com/gp/product/B002PB ... UTF8&psc=1
I used the same fan that figjam uses (Delta 120 x 38mm High-Speed Fan - 190.48 CFM AFB1212SHE-CF00):http://www.frozencpu.com/products/8556/ ... -CF00.html
Then I picked up this 30 watt panel by Aleko for $60!http://www.amazon.com/gp/product/B00A2W ... UTF8&psc=1
Looking at the specs of the fan and the pump, it makes sense that the 30 watt panel is able to drive them both under direct sunlight:
Fan: 1.25 amps
Pump: .5 amps
1.75 amps x 12 volts = 21 watts
One tip I have for others is to think carefully before deviating from figjam's design. For example, the fan he uses is expensive for a reason. It is a serious hot-rod PC cooling fan. You can save money with a standard or salvaged PC cooling fan, but you will be sacrificing air flow significantly.
Also of note is the fact that the circumference of the fan blades is pretty much an exact match for the inner diameter of the 4" septic connector pipe that he recommends for ducting the air from the bucket. It makes for an elegant fit; just be sure to take the time to make the hole in the lid closely conform to size of the pipe.
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