Solar energy | The sun bathes us in energy
Solar energy

The sun bathes us in energy

The sun makes roses and rainforests grow

It warms our body and makes the sea evaporate so that clouds can rain. It is only in the last few years that we have begun to tame its rays.

Today, there are two main ways that we tame solar energy:

With solar heating panels, which can make warm water, and with solar cells that can make electricity. The sun gives us lots of energy but it is unstable. At night or when it is cloudy we cannot tap its energy.

Heat energy from the sun can be stored in large isolated water tanks, but we cannot store electricity from solar cells in an effective way at present.

There is a lot of work being done to try and solve this problem, for example with better batteries or by using the solar cells to cleave water into hydrogen and oxygen. Hydrogen can be stored, so that we can store the sun’s energy.

The best solar cells convert about 25% of the solar energy to electricity. Researchers hope it will be possible to double this amount in the future.

Today, a 1 m2 solar cell can generate 100 kilowatt hours (kWh) of electricity per year. Every Dane uses on average 1,500 kWh per year. This needs 15 m2 of solar cells.

 

 

 

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