A refridgerator compressor may use 100W per hour but a small room AC unit doesn't. The room AC unit I have is of medium strength and only uses 800W Max. There are smaller units available and they would never be run at max capacity.
My computer(s) are always run 24/7/365. The only time there off is when there not working or when I'm out of town for more than a day. It was my understanding that most people around here did the same thing. So anytime I would try to figure power usage I'd go with constant use.
If you used an old Room AC unit or small refridgerator to cool the water you would get 900W of cooling power for the same energy use of 300W of pelt. Also keep in mind that most AC units throttle themselves so its doubtful you'd even reach there maximum rated draw.
Its my understanding your trieing to make something that can go a few degrees below ambient. If you need it selfcontained then go with pelts. If you want low energy use go with a bong, if you want reliability go with phasechange to chill the coolant.
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