FLAT ROOF THINFILM PV

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FLAT ROOF THIN-FILM PV COMPARED TO TILTED THIN
FILM AND CRYSTALLINE PV Ron Swenson
SolarQuestP O Box 7080Santa Cruz, CA
95061 rbs_at_SolarQuest.comwww.SolarQuest.com
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Experimental SetupThree Types of PV Arrays
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Horizontal Amorphous Arrays
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Thin Film Panels Glued to Foam Roofing
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Foam Roofing Handles Penetrations
No leaks
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Electricity Generated First Full Day of Operation
Note late afternoon internal shading near solstice
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Cosine Loss Horizontal Amorphous Array
Significant losses in Winter
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Cosine LossHorizontal vs. Tilted Arrays
Note horizontal performance approaches tilted on
cloudy days
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Comparing over TimeAmorphous vs. Crystalline and
Horizontal vs. Tilted
Note similarity on cloudy days, increase towards
summer
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Comparing Amorphous with Crystalline ArraySunny
vs. Cloudy Days
Note amorphous outperforms crystalline
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Comparing Amorphous with Crystalline over
Temperature Range
Outcome Inconclusive
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It Seemed Okay in March
..but as time went by
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Inverter Losses
Flat top haircut
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Inverter Losses
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Monthly Energy Totals
Horizontal Array
Tilted Array
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Monthly Energy Totals
Crystalline
Amorphous
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See for yourself!
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