(i) In the solar cells, the energy is obtained only during the day, when the Sun shines.
(ii) In the solar cells, the solar- panel convert solar energy into electricity, which is stored in storage battery. The storage battery give the direct current but all the appliances are working by the alternating current, so first of all direct current is converted into alternating current by any suitable appliances before it can be used to run various devices. So, it increases the cost of using solar panels as the source of energy.
So, the solar cell is not used to meet all our energy needs.
