Unc is the natural convection heat transfer coefficient. )that the optimal current of the hybrid system at the
local maximum power output point (MPP) is almost the same as that
Fig. 5. The power output of the hybrid system versus the current I of the PV module
for some given parameters: (a) c ¼ 5; 8; 13 m and ZTC ¼ 1, and (b)
ZTC ¼ 0:7; 1:0; 1:3 and c ¼ 5 m. The values of parameters G; U1A1; U2A2; TC , and
RL2=R are the same as those used in Fig. 3.