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Has anyone used EMT for the rails to mount solar panels either on a roof, or ground mount ? It is cheap in 10 foot sections here ($6.50 for 1/2"). For less than $200, I can mount 16 or more panels on my roof, including clips, clamps etc. Can somebody tell me why I should NOT use it ? Thanks !

Off grid - no street service. (2) EG4 6500-ex, EG4 load center PDP, (2) EG4 powepro 14.3Kw batteries, (30) 305w solar panels. Just getting to installing everything. PDP should bond neutral and ground I believe, and output will go to my Breaker panel. I plan to have 2 grounds at equipment -- 1 is...