Over on the OCC Facebook page Anne Lloyd has posted a link to a YouTube video showing an experiment with solar panels wired in parallel and then in series, and the effect of shading. It seems to demonstrat a significant performance advantage from wiring in parallel. It would be interesting to get some expert (or even not so expert) views on here as well as on Facebook.

Yes, I was having a bit of a senior moment yesterday-in order for the voltage to remain at 12v they have to be wired in parallel. The impact of shading was quite interesting though. Cheers.