\(P_PV^t=\sum_(^{ }g=1)^(N_s)âãPG_PVg*P_s(s_g^t)ã(7)\)
Here g determines the variable of state (period) and Ns the number of discrete states of solar radiation. Is also g amin state / solar radiation level in t amin time fragment. The probability of solar radiation for each state for each specific time frame is calculated as follows: \cite{Lappalainen_2017}