Question

explain the conversion of solar energy into heat?

Answer 1

First, convert solar energy into electricity and then convert it to heat. The first option will be high in efficiency but little unconventional compared to the 2nd one. Solar Energy is already is the form of heat energy (and light energy) - so no need to convert it. You only need to store the heat energy.

Answer 2

there are two ways
1)direct conversion through concentric solar panels .
2)firstly converting into electricity then into heat.