Wrenches, (This question actually does refer to the proper use of 'wrenches'...)
While inspecting some recent work from one of our contractors, we noted that the PV module clamps had been torqued to ~150% of the racking manufacturer's specified value. My question is whether that might have any detrimental effect on the modules (frame, glass, cells, seal, etc) and whether it would be worth loosening the clamps and re-torquing them to the proper spec? For reference, 224 modules are installed. We were made aware that the contractor used an impact driver on the clamps, which accounts for the excessive torque applied. I definitely understand the temptation to use an impact driver for just about any hardware that needs turning—but my understanding is also that impact drivers are generally incompatible with machine screws. So my other question to the group is whether anyone has had success in dissuading subcontractors from using impact drivers so liberally on project sites? Any advice is appreciated. -- Corey Shalanski Jah Light Solar Portland, Jamaica
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