Assume you have a 10 kWdc PV array installed in Philadelphia (Zip Code 19104). U

Question

Assume you have a 10 kWdc PV array installed in Philadelphia (Zip Code 19104). Use results from PVWatts to graph the annual energy production as the array is pointed ±90° from South. Use a latitude angle panel tilt, and keep the steps in azimuth angle at or below 10*. At what azimuth angle are you at 90% of peak production? In Section 4.3.2 the authors state that the optimum elevation angle is 90% of the latitude. Use results from PVWatts to attempt to verify this claim. Elevate the array ±15° from the latitude and graph the result. Use an azimuth angle of 180°. At what angle do you find the peak yearly energy production?

Explanation / Answer

Philadelphia :-

Latitude - 39.95260 N

Considering Fixed array and polycrystalline modules, loss = 14%

Using PVwatts

Clearly the production of energy is maximum when azimuth angle is 180 due south.

The 10kW system yield maximum energy when

Azimuth angle is 1800 and Inclination angle is 39.95260 .

Azimuth angle    90 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 Inclination angle 39.9526° 39.9526° 39.9526° 39.9526° 39.9526° 39.9526° 39.9526° 39.9526° 39.9526° 39.9526° 39.9526° 39.9526° 39.9526° 39.9526° 39.9526° 39.9526° 39.9526° 39.9526° Energy Yield(kWH) 10,392 11,428 11,890 12,300 12,647 12,936 13,151 13,275 13,313 13,262 13,129 12,904 12,610 12,251 11,834 11,363 10,858 10,316

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