Modeling and Optimization of a Residential Solar Stand-Alone Power System

Table 8

Calculated extraterrestrial irradiation and daily irradiation for the average day of each month.

Month	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
Average Day	17	16	16	15	15	11	17	16	15	15	14	10
𝑛 (add 1 if leap year)	17	47	75	105	135	162	198	228	258	288	318	344
𝐻𝑜 (MJ/m^2)	21.27	25.97	31.58	36.81	40.01	41.13	40.46	37.93	33.39	27.55	22.33	19.9
𝐾𝑇	0.6159	0.6286	0.6395	0.6607	0.6721	0.6835	0.6897	0.6705	0.6503	0.6428	0.6405	0.6281
𝐻 (MJ/m^2)	13.1	16.32	20.19	24.32	26.89	28.11	27.91	25.43	21.71	17.71	14.3	12.5