Joel,
The angle of incidence certainly has a bearing on the ability to handle
impact. We installed a 9kW pole mounted system in the vicinity of a golf
course. We thought the distance from the course and the trees to the north
of the array would protect us. Occasional balls actually did come ove
Wrenches,
UL1703 requires solar modules withstand a 5 ft-lb (6.78 J) impact from a
2-in (51-mm) steel ball weighing 1.18 lb (535 g) falling through a distance
of 51 in (1.295 m). Many years ago someone (perhaps at Arco Solar in the
early 1980s?) said that this force was equal to a golf ball or
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