Peltier are ungodly ineffective..... Interesting thought tho
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I think maybe you meant in-efficient and you'd be right for sure but I was thinking if you had surplus solar its not getting used anyway and you could pre cool the insulated keg then use the ARB for final temp drop.I believe these use peltier chips to cool beer to 35 or so below ambient, and a good amount of people use them from what I hear, but I don't have the cash for them...
I use a peltier cooler in my service truck and it gets pretty damn cold, not freezing or anything but it will easily keep my drinks cold. They are not the best for allot of projects but they are simple.
That's a good price on that pump. I have been wanting to add a bladder tank to dampen the noise and provide short burst water supply without running the pump (night time piss break).