It's a pretty old idea, if you want to void the warranty of your PV's you can focus more light on to them boosting the output even more (twice the light gives twice the output) at that point you do need water cooling, or the Fresnel lens focused PV that were sold for a while worked really well with water heating systems as the PV for a square foot lens was about 1/2" across, but the tracking system have bugs and still tend to brake down.
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