>>20 years guarantee for the solar panel.

> Thats well within the practical lifespan of a solar panel- is it
> not?

I'd have thought that was a fairly enthusiastic guarantee but may be
doable. Actual lifetimes can be far in excess of that for 
polycrystalline cells but at 20 years your implementation has to be 
spot on or you get failures for secondary reasons.

The amorphous silicon cells die far far more quickly than that - a few
years to marked light induced degradation. This is the subject of
ongoing research.


        Russell



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