Unisolar Roofing [RE-wrenches]

[Steve Bell]

----- Original Message -----
From: "William Miller" <wrmiller at slonet.org>
To: <RE-wrenches at topica.com>
Sent: Wednesday, March 14, 2001 04:12 PM
Subject: RE: Unisolar Roofing [RE-wrenches]


> Bill:
>
> I am located in San Luis Obispo County.  I have a client that installed
his
> own ground mount array at 210 deg. true.  I need to know in this type of
> situation, how much reduction in output will they have?  I would like to
> own software that can determine this as it comes up frequently.
>
> William

I ran a couple of quick sizings using Santa Maria as the data site. For
grid-tie applications the highest average annual array output is 6.05
Sun-hours (kw/m3) if the array faces due south. Mounting the array at 210
degree (30 degree west of due south) the solar resource available output
drops to 5.93 Sun-hours, not much of a drop.

If the system is a battery-based standalone, then the best array tilt for
the worst month (January) is 55 degrees. If facing due south you will get
4.96 sun-hours in January. Mounting the array at 210 degrees reduces the
resource to 4.54 sun-hours.

I hope this is useful. I used the Siemens PVDesigner program.

Sincerely,
Steve Bell
SunWize Technologies

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