Why is it not possible to make use of solar cells to meet all our energy needs? State atleast two reasons to support your answer.

(i) The electricity generated by solar cells during the day is stored by using it to change storage batteries. These storage batteries give us direct current, but to operate the various devices, alternating current is required.
(ii) The usage of solar cells becomes expensive, since the direct current given by the storage batteries has to be changed into alternating current using suitable appliances.