In 2018 the solar market grew by 20.1% in total capacity

This is pretty encouraging given the uncertainty that was created with tariffs, trade wars, etc. Do you provide insights into what those numbers might have looked like without those factors?

But

We need power 24-7 also at nighttime and even at a cloudy day.

A 20.1% growth in total installed capacity sounds good, but I believe that's for the global market. Globally, the total installed solar capacity is small. That makes it easy to show a large percentage increase, year on year. More concerning is that the growth in California, Germany, and China, where the installed base of solar is higher, the rate of growth is significantly lower. Worse still, Bloomberg report tha in the first half of 2019, global investment was down rather sharply. The growth curve is still upward, since very little capacity is being retired. But it seems to be curving downward.

The more intermittent renewables contribute to the grid, the more expensive it is to accommodate them. It's hard to solve the problem, in part because wind and solar advocates are so insistent that it doesn't exist.