The fourth output of the proposed program is the capacity of the hydrogen storage tank. The hydrogen storage tank is a daily storage; hence it should withhold the amount of hydrogen required by the fuel cell in the absence of radiation. Fig. 5 emphasizes the period of working electrolyzer through route B during sun hours and full in H2 storage tank. On the
other hand, it shows that the fuel cells are working during route C and D. From this figure it can be seen that the maximum storage value equal to 12840 Nm3-H2 which is equal
to the sizing of the storage tank.