We have such a system in our area, NW WA. It was featured in the
cover story of HP124.
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.
Specs on system here:
Modules: 18 Sanyo HIP-195BA3, 195 W STC, 55.3 Vmp
Array: 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
Array combiner boxes: Two GroSolar
Array installation: Direct Power & Water Power Rail mounts, 36-degree
tilt (south-facing roof) and 30-degree tilt (west-facing roof)
Inverters: Two Fronius IG 2000, 500 VDC maximum input voltage,
150-450 VDC MPPT operating range, 240 VAC output
System performance metering: Fronius IG Personal Display and
production KWH meter
Ian
At 1:37 PM -0400 10/6/09, Nicholas Ponzio, Building Energy wrote:
Hey Folks,
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.
Thanks,
Nik
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