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<div>We have such a system in our area, NW WA. It was featured in the
cover story of HP124.</div>
<div><br></div>
<div>The roof angles are not exactly the same, but close (and I'm
guessing lower roof angle for west-facing would increase overall
production -- ??). In the first year, the west-facing array produced
about 14% less than the south-facing array, corrected for size.</div>
<div><br></div>
<div>Specs on system here:</div>
<div><font color="#000000"><b>Modules:</b> 18 Sanyo HIP-195BA3, 195 W
STC, 55.3 Vmp</font></div>
<div><font color="#000000"><br></font></div>
<div><font color="#000000"><b>Array:</b> Two, five-module series
strings, 1,950 W STC total, 276.5 Vmp (south-facing array); two,
fourmodule series strings, 1,560 W STC total, 221.2 Vmp (west-facing
array); 3,510 W total</font><br>
<font color="#000000"></font></div>
<div><font color="#000000"><b>Array combiner boxes:</b> Two
GroSolar</font><br>
<font color="#000000"></font></div>
<div><font color="#000000"><b>Array installation:</b> Direct Power &
Water Power Rail mounts, 36-degree tilt (south-facing roof) and
30-degree tilt (west-facing roof)</font></div>
<div><font color="#000000"><b><br></b></font></div>
<div><font color="#000000"><b>Inverters:</b> Two Fronius IG 2000, 500
VDC maximum input voltage, 150-450 VDC MPPT operating range, 240 VAC
output</font><br>
<font color="#000000"></font></div>
<div><font color="#000000"><b>System performance metering:</b> Fronius
IG Personal Display and production KWH meter</font></div>
<div><font color="#3A9461"><br></font></div>
<div><br></div>
<div>Ian</div>
<div><br></div>
<div><br></div>
<div>At 1:37 PM -0400 10/6/09, Nicholas Ponzio, Building Energy
wrote:</div>
<blockquote type="cite" cite>Hey Folks,</blockquote>
<blockquote type="cite" cite><br>
Anybody have real data to compare productions for south-facing vs,
west-facing PV array? PVWatts is only showing about a 7% derating for
facing west.</blockquote>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite>Thanks,</blockquote>
<blockquote type="cite" cite>Nik</blockquote>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite><br>
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<x-sigsep><pre>--
</pre></x-sigsep>
<div>Ian Woofenden <ian.woofenden@homepower.com>, Senior Editor,
Home Power magazine<br>
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