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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>Ok here is the puzzler-<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>A Mountain cabin on the north side of a mountain & 5 hours of 400 watts of PV would run the place 12 months of the year. 24 VDC system & minimalist load schedule.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>We cannot mount on the roof as it gets to 4-5’ deep and slides all at once in spring and would shear off anything up there.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>South side Upper portion of south wall gets winter sun for 2.5 hours. Lower portion summer sun only and upper may get some shade from overhang of soffit. There is an assortment of windows on south side.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>West side actually gets 2.5 hours of sun on an indirect angle due to how the mountain and valley open up to the west; it is hard to match a tangent sun angle without some very creative angling and interference with a couple of scraggly old spruce trees. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>I would cut them down as they look disturbed from the construction and the roof sheds 4-5’ of snow all at once in the spring melt off and this may take them out anyway.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>Client wants to not obstruct the windows and the views & to mount [5] pairs of 200 watt used [same make & model] modules he has collected from a grid tie system that got run over by a center pivot irrigation system. Please do not ask it was not mine.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>On the south side [1] pair would be in landscape and [2] pairs in portrait stacked one set above the other. The lower set would see summer sun the upper pair would get shaded.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>All 5 pairs will never see the sun at once. Actually 3 pairs might see sun at any given time, maybe at some point in the the year.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>I speced: [1] Outback FM80 CC & Outback Eng said if we use the FM80 [has enough wattage capacity at 24 volt to handle this collection] that it will operate at the low end of its MPPT range to accommodate the shaded modules not the ones in full sun.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>Do I use 5 separate charge controllers to deal with in actuality 5 separate arrays? Or [2] charge controllers - South wall and west wall or live with an oversized array that operates at the low end of its MPPT range? <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>None of the choices are great; the house was built with a hydro system in mind till he found out that the water stops running once it freezes [opps].<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'>Fellow solar puzzlers - How would you do this?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Century Gothic","sans-serif"'>Dana Orzel - Great Solar Works, Inc - E - <b>dana@solarwork.com</b> - V <b>970.626.5253</b><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Century Gothic","sans-serif"'>F - 970.626.4140 C - 970.209.4076 web - www.solarwork.com <o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Century Gothic","sans-serif"'>"Responsible Technologies for Responsible People since 1988"<o:p></o:p></span></p><p class=MsoNormal><b><i><span style='color:green'>Please consider the environment before printing this email</span></i></b><span style='font-family:"Century Gothic","sans-serif"'> </span><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif"'>NABCEP # 051112-136</span><b><i><span style='color:#99CC00'><o:p></o:p></span></i></b></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>