Go to your local electrical supply shop and get Gantry or unistrut (name changes on local). Cut it to size and buy the clips and adapters to put it all together.
I see the Unistrut SLR100 solar panel clamps and they appear to be UL-listed, so that does seem like a good option . I just need to find galvanized or aluminum strut locally.
Do you have any recommendations for hardware to mount the strut to the roof?
QuickBolt II are solid and reasonable
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