> In a cloudy area, mirrors can be used (carefully) to increase the
> concentration of sunlight while not exceeding the ratings on the panels. 
>
> --
> James.
>   
I'm under the impression the limiting factor is temperature rather than 
anything else, IE you could put 4x the sunlight onto your cells with 
mirrors if you water cool them back below around 60C. (which wont use 
that much energy really)
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