Question

10 m² of PV panels operating at 12% efficiency are mounted on a south-facing roof with a pitch of 6 in 12 (i.e., 6 m of vertical rise for 12 m of horizontal distance). Determine the peak potential electrical power production (in W) for clear and cloudy days during the spring/fall equinoxes and summer/winter solstices if the house is located in Beijing.

Answer 1

given data:

Area of panel installed is 10 m2, Efficiency= 12%, Inclination angle= 26.56,

Weather data for Beijing, Location- Lattitude=39.55⁰N, Longitude=116.23⁰E

in (Wh/m2)	March	june	sept	December
Ib (beam radiation)	747	538	633	742
Id(Diffuse radiation)	219	360	239	115

Clear day calulation of power is shown in figure

Power produced(W)	21march	23Sept	21 june	21 dec
Clear sun	1161.7	1035.6	1087.5	1597.3
50% covered	580.85	517.8	543.7	783.6