Thanks for the link Lmagic, I've done a few more tests with other solar panels and concentrating the sun definatley works. I'm using a stainless steel splashback from a cooker to great effect at the moment.
There are limitations though:
If there's no sun the mirror makes no difference
Some kind of solar tracking seems to work best, even if it's very basic.
Most solar panel manufacturers say that concentrating the sun by use of lens or mirrors will void the panel warranty
The only downside I can see to concentrating sunlight on a solar panel is, heat. I wouldn't concentrate miday sun in the middle of summer, so that'll rule out using my mirror for about three days worth of this year.
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