Holt, the rule of thumb is equal parts pipe above and below ground. In your case you might want to consider a large belled 36" diameter concreate pier with a ring of oversized anchor bolts. The pole bottom would need a large flange with very robust gussets. Extend that larger base, 6-8 feet up and scaled down to a smaller diameter pole to the top. You'll want to do the complete assembly and wiring before lifting into place with a crane. Kind of like a mono-pole wind turbine. We've built trackers of ~125 sq ft PV area in high-wind locations and mounted them on Wattsun AZ-225 dual axis tracker drives. The 225 is designed for up to 225 sq ft of PVso the system has very little movement from the undersized array even in high winds like today. You'll get some pretty scary movement at that height regardless of the pipe size.
Jim Duncan North Texas Renewable Energy NABCEP Certified Solar PV Installer No.031310-57 TECL 27398 nt...@1scom.net 817.917.0527 www.ntrei.com -----Original Message----- From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org]On Behalf Of hol...@sbcglobal.net Sent: Tuesday, March 22, 2011 8:13 AM To: RE-wrenches Subject: [RE-wrenches] Tall pole mount Situation: Client has limited locations for array due to trees. There is one spot that would work IF pole mount is 20-25' (that would put the array top edge at 30'+). Will need to incorporate tracker to maximize production. Will definitely be consulting structural engineer. Questions: Anyone tried this? Comments or lessons learned? Holt E. Kelly Holtek Fireplace & Solar Products 500 Jewell Dr. Waco TX. 76712 254-751-9111 www.holteksolar.com
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