UL researched the subject and has both a report and online learning module on the subject specifically for firefighters. http://www.ul.com/gl...vice/pvsystems/ This is a great study by UL.... Very informative!! However, accurate knowledge of the operations of a commercial or residential PV systems must be present in order to create adequate protocols for your department. According to UL we can now fight fires that involve these solar modules, but proper techniques MUST BE used. DC electricity is not our friend, nor is the increased weight load!