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

Table 10

Accuracies of the energy production estimations.

	RMSE (kWh/day)	MBE (kWh/day)	MAE (kWh/day)
Energy production by measured insolation	0.85	0.38	0.66
Energy production by predicted insolation
Year	2.70	−0.36	2.28
Spring (Mar, Apr, and May)	3.25	0.05	2.60
Summer (Jun, Jul, and Aug)	2.57	0.42	2.17
Fall (Sep, Oct, and Nov)	2.43	−0.08	2.14
Winter (Dec, Jan, and Feb)	2.45	−1.13	2.20