Development of Optimal Tilt Angle Models of a Photovoltaic Module for Maximum Power Production: Ethiopia

Table 7

Performance evaluation of the anisotropic developed optimal tilt angle model using statistical indices.

Time	Anisotropic models
	RMSE	MBE	MAE	MAPE	R^2	RMSE	MBE	MAE	MAPE	R^2
	Equ (19)					Equ (20)
Winter	0.259	0.125	0.213	0.58	1.000	0.459	0.328	0.405	1.12	0.9998
Spring	0.092	0.035	0.073	1.96	0.9994	0.117	0.089	0.096	2.84	0.9990
Autumn	0.257	0.082	0.212	1.00	0.9998	0.237	0.136	0.178	0.87	0.9999
Annual	0.139	0.094	0.119	0.78	0.9999	0.290	0.256	0.263	1.79	0.9996
	Equ (22)					Equ (23)
Winter	0.459	0.328	0.405	1.12	0.9998	0.094	-0.033	0.080	0.21	1.000
Spring	0.117	0.089	0.096	2.84	0.9990	0.109	-0.010	0.086	2.24	0.9994
Autumn	0.237	0.136	0.178	0.87	0.9999	0.203	-0.098	0.171	0.80	0.9999
Annual	0.222	0.178	0.198	1.34	0.9998	0.047	-0.003	0.040	0.25	1.000