Consider hong kong (latitude= 22.3964° n, longitude= 114.1095° e, gmt+8), the value of direct solar irradiance on the 23rd of march at solar noon is 0.48 kw/m2 on an horizontal plane and the daily average solar irradiation on an inclined plane at latitude and south facing is 4.8 mj/m2. the maximum ambient temperature in march is typically around 22.5º c.