ject: Re: [RE-wrenches] Real world PV production
To: "RE-wrenches"
Date: Friday, June 11, 2010, 11:54 AM
Joel, Thanks for the information. 35% loss due to to smog or soiling is a big
hit and, I'm sure, an exception. Still, if the loss is even 20% it supports the
concept that an
nal Message -
From: Kelly Keilwitz, Whidbey Sun <mailto:ke...@whidbeysunwind.com> & Wind
To: RE-wrenches <mailto:re-wrenches@lists.re-wrenches.org>
Sent: Thursday, June 10, 2010 7:57 AM
Subject: Re: [RE-wrenches] Real world PV production
Thanks, Don,
Performance pr
Keilwitz, Whidbey Sun & Wind
To: RE-wrenches
Sent: Thursday, June 10, 2010 7:57 AM
Subject: Re: [RE-wrenches] Real world PV production
Thanks, Don,
Performance predictions such as from PV Watts VASTLY underestimate
PV production in our area. For example, PV Watts estimates 940 kWh/
kW for a 4
ches.org)
Sent: Thursday, June 10, 2010 7:57 AM
Subject: Re: [RE-wrenches] Real world PV production
Thanks, Don,
Performance predictions such as from PV Watts VASTLY underestimate PV
production in our area. For example, PV Watts estimates 940 kWh/kW for a 4:12
pitch at 180˚, whereas s
On Jun 10, 2010, at 7:57:53 AM, "Kelly Keilwitz, Whidbey Sun & Wind"
wrote:
PV Watts VASTLY underestimate PV production in our area.
PV Watts underestimates in Central Ca too.
Don
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List Address: RE-wrenches
the mine.
Joel Davidson
- Original Message -
From: Kelly Keilwitz, Whidbey Sun & Wind
To: RE-wrenches
Sent: Thursday, June 10, 2010 7:57 AM
Subject: Re: [RE-wrenches] Real world PV production
Thanks, Don,
Performance predictions such as from PV Watts VASTLY undere
Thanks, Don,
Performance predictions such as from PV Watts VASTLY underestimate PV
production in our area. For example, PV Watts estimates 940 kWh/kW for
a 4:12 pitch at 180˚, whereas such systems are actually producing up
to 1300 kWh/kW (as measured by a renenue-grade production meter). We
On Jun 9, 2010, at 8:22:12 AM, "Kelly Keilwitz, Whidbey Sun & Wind"
wrote:
Thanks, Joel
How about PV systems away from the coast, in a hotter, dustier
location, like Bakersfield, Fresno, Sacramento, Palm Springs,
etc?
In central CA we do a little better. I casually monitor several sy
degrees F.
Average minimum winter temp. 46 degrees F.
- Original Message - From: "Kelly Keilwitz, Whidbey Sun &
Wind"
To: "RE Wrenches listserve"
Sent: Tuesday, June 08, 2010 10:34 AM
Subject: [RE-wrenches] Real world PV production
CA Wrenches,
What d
AM
Subject: [RE-wrenches] Real world PV production
CA Wrenches,
What does a PV system in a hot, smoggy or dusty area of California
actually produce, in kWh/kWp/year? Not an ideal system that is washed
every month, but real-world, average system figures, verified by a
production meter.
Thanks
CA Wrenches,
What does a PV system in a hot, smoggy or dusty area of California
actually produce, in kWh/kWp/year? Not an ideal system that is washed
every month, but real-world, average system figures, verified by a
production meter.
Thanks,
-Kelly
Kelly Keilwitz, P.E.
Whidbey Sun & Wind
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