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Brian,
PV Watts assumes several variables which are constant. I am
also a rep for PowerLight, who has installed the largest solar systems in the
world, out of Berkeley, California. PowerLight uses their own
simulation program based originally on PV Watts but more detailed to more
accurately predict solar performance. Their estimated energy output is also
usually lower than PV Watts predicted values since they often have to guarantee
performance over 20+ years. We also do have a solar specialist in house
who writes his own hourly simulation programs for solar, wind and
distributed generation systems.
Renée Renée Azerbegi, CEM, LEED-AP ambient energy ? solar & sustainable design
solutions t 303.278.1532 | f
303.278.8533 | c 303.885.2695 | renee@xxxxxxxxxxxxx
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ambient-e.com
From: bldg-sim@xxxxxxxx [mailto:bldg-sim@xxxxxxxx] On Behalf Of Brian Thornton Sent: Tuesday, December 19, 2006 10:28 AM To: bldg-sim@xxxxxxxx Subject: [bldg-sim] photovoltaic output in DOE-2 and PV Watts I am simulating a 28.1 kW array in
DOE-2 (eQuest 3.6) and in PV Watts. The array is flat, on a rooftop with
150 Sanyo 195 modules, and 6 PVPowered 4800W
inverters. DOE-2 gives results with 20,600 kWh
annual AC production using the standard model
methodology. PV Watts gives about 25,000 kWh
annual AC production. Solar designers in Can anyone share experience with
DOE-2 modeled PV output vs. PV Watts, or offer any suggestions on variables of
primary concern in the DOE-2 input? If anyone is truly expert on
modeling solar PV in DOE-2, and can validate results with other calculation
tools, I would be interested in hiring you for some limited consulting.
Brian Thornton,
PE p. 503-231-6600 f.
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