[bldg-sim] photovoltaic output in DOE-2 and PV Watts

Subject: [bldg-sim] photovoltaic output in DOE-2 and PV Watts

From: "Brian Thornton" <thorntonenergy@xxxxxxxxxxx>

Date: Tue, 19 Dec 2006 09:27:55 -0800

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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 Portland support this higher value from actual building results.

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

Thornton Energy Consulting

p. 503-231-6600 f. 503-231-3555

thorntonenergy@xxxxxxxxxxx


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