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Eric,<div><br></div><div>We just used helical screw piers on a 5.6kw ground mount</div><div>The site was difficult due to its slope and soft because the frost had come back out after some warm days</div><div>There was an excellent chance that a concrete truck would have gotten stuck and a back hoe would have made a mess</div><div>The 4 wheel drive unit that drives the helical screw piers had no trouble navigating the terrain, did no damage to the site, was in and out in less than a day. </div><div>The piers were in two parallel rows and all were within 1/2" of our string, though that is in the skill of the operator</div><div>In very rocky soil it might be more problematic</div><div><br></div><div>Larry Brown</div><div>Sun Mountain</div><div><br></div><div><br></div><div><div><div>On Jan 25, 2009, at 8:05 PM, Eric Andrews wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"> <div class="Section1"><p class="MsoNormal"><font size="2" color="#c00000" face="Arial"><span style="font-size:11.0pt;font-family:"Arial","sans-serif";mso-bidi-font-family: "Times New Roman";color:#C00000">Does anyone have any experience using Helical screw pier footing for ground mount racks?<o:p></o:p></span></font></p><p class="MsoNormal"><font size="2" color="#c00000" face="Arial"><span style="font-size:11.0pt;font-family:"Arial","sans-serif";mso-bidi-font-family: "Times New Roman";color:#C00000"><o:p> </o:p></span></font></p> <div><p class="MsoNormal"><font size="3" color="#c00000" face="Arial"><span style="font-size:12.0pt;font-family:"Arial","sans-serif";color:#C00000; mso-no-proof:yes">Eric </span></font><i style="mso-bidi-font-style:normal"><font size="1" color="#c00000" face="Arial"><span style="font-size:8.0pt;font-family: "Arial","sans-serif";color:#C00000;font-style:italic;mso-bidi-font-style:normal; mso-no-proof:yes"><o:p></o:p></span></font></i></p><p class="MsoNormal"><font size="1" color="#c00000" face="Arial"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#C00000; mso-no-proof:yes"><o:p> </o:p></span></font></p> </div><p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:11.0pt; font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman""><o:p> </o:p></span></font></p> </div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">_______________________________________________</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">List sponsored by Home Power magazine</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Options & settings:</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">List-Archive: <a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">List rules & etiquette:</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">www.re-wrenches.org/etiquette.htm</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Check out participant bios:</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">www.members.re-wrenches.org</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div> </blockquote></div><br></div></body></html>