130 W Panel PairM ax DC Pow er 0 20 40 60 80 100 120 140 160 13 13.1 HourofDay(CST) W atts 190 W Panel DC Pow erto Inverter 0 20 40 60 80 100 120 140 160 180 200 220 240 13 13.1 HourofDay(CST W atts Pm ax for130W PanelPairw ith I-V C urve Tracer O ne D ay Six TypicalM inutes ofthe D ay C om pare C om pare sponding P Drawn from Neighboring 190W Panel Connected to a Back-of-the-Panel 240Vac In
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Corresponding P Drawn from Neighboring 190W Panel Connected to a Back-of-the-Panel 240Vac Inverter.
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130 W Panel Pair Max DC Power
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13 13.1
Hour of Day (CST)
Watt
s
190 W Panel DC Power to Inverter
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13 13.1
Hour of Day (CST
Watt
s
Pmax for 130W Panel Pair with I-V Curve Tracer
One Day Six Typical Minutes of the Day
Compare Compare
Results:
Corresponding P Drawn from Neighboring 190W Panel Connected to a Back-of-the-Panel 240Vac Inverter
2
Cloud pattern moving 10-20 meters/sec
A repeating pattern. The circles represent moving shadows due to clouds. When no shadow, use panel clear sky Pmax for the given time of day and panel
orientation. When inside a 50-second diameter (see A), use Pmax / 3. When inside a 5-second circular transition ring (see C – A), assume linear variation
between Pmax and Pmax / 3.
2 mins
5 sec
50 sec
A C
For cloud shadow speed = 10 m/s, A = 500 meters, C = 600 meters
For cloud shadow speed = 20 m/s, A = 1000 meters, C = 1200 meters