at the end of the day they are only domestic properties and there is no way to turn the power off to make them 100% safe without:-
destroying them, covering them up, or wait till sun goes in.
commercail set ups where there are 100+ then things should be done diffrently. but still even then, each panel is still producing power no mater what you turn off!
i think what the worrying part is that some people dont know how solar panels work and where all the electric is being produced! and the wiring of them!
I agree RC. People don't know how they are wired etc. Even though a panel may produce power though, it will not electrocute you. But why would 100+ panels be done differently than a domestic with 16?
just with the ammount of power that they are producing all together, its like a mini power plant, plus there are more safety laws that you have to comply with on the sites.
Very true, but you only need one bad one.... 
yep, but still as there is no way of turning an individual solar panel off anyway, the risk is always there no matter what is done,
the only 100% way to stop the pwer on one will destroy the panel leaving it no good.
I think our difference of opinion comes down to the fact that you think they should be turned off and as my installer explained to me, they can be on, but carry no threat of electrocution. I am not interested in getting them all turned off. I am only interested in not being electrocuted. Pretty sure you are the same mate. 
my thoughts, knowledge and speaking to several compaies that make, supply and fit them and they all say that there is no need to turn them off because of all the built in safety cut outs in the system anyway. if there is a short in any system then the inverter will trip out killing all power, but the panels will still be live.
its like how the RCD units work on the main electric board. if all is working right you can grad hold of the live wires and before you get a shock the power is triped out.
so for domestic systems there is no need to turn aything off at all.
i say turn them off in commercial solar farm just to the fact of how much power is about on that site.
what people dont know is that I come from a building background farther used to build them from scrach and been doing it for 30+ years, ive been doing it for 10 years solid, then before that 6-7 years part time. other side to my business is in property maintenance, electrics, water, building, etc etc