Estimating Solar Insolation and Power Generation of Photovoltaic Systems Using Previous Day Weather Data

Table 8

Range of measured solar insolation (unit: kWh/m²/day).

Month	Maximum value	Minimum value	Mean value	Difference between maximum and minimum values	Standard deviation
January	3.34	0.54	2.37	2.80	0.70
February	4.42	0.61	3.04	3.80	1.20
March	5.05	1.35	4.07	3.70	0.97
April	7.10	0.91	4.94	6.19	1.87
May	7.70	1.55	5.77	6.15	1.65
June	7.93	0.96	5.72	6.97	1.81
July	6.29	0.56	3.42	5.73	1.76
August	6.79	0.83	3.73	5.96	1.74
September	6.00	0.01	3.95	6.00	1.72
October	3.11	0.62	2.14	2.49	0.70
November	2.31	0.34	1.59	1.96	0.60
December	1.95	0.19	1.36	1.75	0.58