Nothing in the article you linked to supports your claim that "Cloud is not really such a problematic factor". In fact, the article explicitly states:
> However, clouds can block light from the sun. So, do clouds affect the creation of energy by solar panels? Yes, but it depends on the types of clouds and where those clouds are in the atmosphere.
> When sunlight hits low clouds, a lot of that light – and heat – is reflected back into space. […] So, if you live in a place that commonly has a lot of low clouds, solar panels might not be able to produce as much energy as they would somewhere else.
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> And the nice thing about nights is that they are quite predictable. So not a very difficult problem to solve.
Non-sequitur. The fact that it's predictable doesn't mean it's not a difficult problem.
> However, clouds can block light from the sun. So, do clouds affect the creation of energy by solar panels? Yes, but it depends on the types of clouds and where those clouds are in the atmosphere.
> When sunlight hits low clouds, a lot of that light – and heat – is reflected back into space. […] So, if you live in a place that commonly has a lot of low clouds, solar panels might not be able to produce as much energy as they would somewhere else.
——
> And the nice thing about nights is that they are quite predictable. So not a very difficult problem to solve.
Non-sequitur. The fact that it's predictable doesn't mean it's not a difficult problem.