Are PV panels mounting holes threade or do they have through holes
I am trying to find out the answer to this simply question on the net and its not so easy to find. I can find mounting hole spacing drawings for different panels but what I cant find out is are these holes threaded? (what size bolts) or do they go right through the frames. If they go through what cross section do most manufacturers use for the frame around the edge and then where does the nut go on the face of panel or is it some type of H channel frame. I am particularly wondering about solar world's new large panels. Thanks!
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