Look at the amps those fans draw for the amount of cfm.http://www.absoluteradiator.com/FanStore.asp
If you have that kind of power available it would be cheaper to get an inverter and buy a lasco box fan from walmart. $14 (2500 cfm)
Since you'll be going AC there are a lot of pumps to choose from, also cheap.
And they still won't consume the power that those rad fans take.
Keep in mind that the bigger the cooler, the more water it will use.
A 1000 sq. ft. house here will have a 4500cfm cooler.
They use 5 gals. an HOUR!!!
I hope you post you progress and testing.