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diy solar

Grounding 72v roof panels mounted to steel bus frame

chrisstratton

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May 24, 2021
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I'm getting ready to mount some SunPower 435W recycled panels to my shuttlebus roof. I have sunk rivet nuts into the ribs of the bus roof and mounted brackets. Painted unistrut will be mounted to that and then the panels, secured with Amazon end and mid panel hardware affixed with the steel spring nuts. I suspect that the aluminum hardware-clamps to the aluminum panel frames will create some sort of ground to the unistrut then down into the bus' steel ribs. Is this adequate, or should I configure a separate ground, and if so, of what guage? I plan 4 of 435W panels (72v) connected in parallel, each with just short of 7amps capacity, if I recall correctly.

Any advice before I proceed to get the used panels?? Should I run a separate grounding strap - and if so, of what guage? TIA. I really appreciate all the help given me here in planning and developing this project.
 
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