Almost everyone has a roof where PV can be mounted, BUT you need to make them so they can be quickly removed in the event of a fire because they can't be turned off and one of the most common places for fires is in the attic, so they often have to cut through the roof (and solar panels!) which is a significant shock potential to firemen.
Solar Panel System Dangers : Florence Township Fire Department
http://www.scientificamerican.com/article.cfm?id=explosive-gas-silane-used-to-make-photovoltaics
Solar Safety for Firefighters: The Myths and the Facts
Solar Panel System Dangers : Florence Township Fire Department
http://www.scientificamerican.com/article.cfm?id=explosive-gas-silane-used-to-make-photovoltaics
Solar Safety for Firefighters: The Myths and the Facts
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