Sound Heating and Air Conditioning Inc. Blog: Posts Tagged ‘Solar Cells’

How Do Solar Cells Work?

Friday, May 27th, 2011

Rising energy costs and concerns over depleted resources have many people seeking out alternative energy sources for their homes. One popular solution is solar cells, which harness clean energy from the radiation of the sun to use as electricity. This technology is not terribly new, of course, having been used in calculators for years. A house is rather different from a calculator, though, so the prospect of using solar cells as a source of electricity lends itself to some questions, especially “how does it work?”

How it Works

As you might imagine, there is some complex science behind how cells really work. Rather than get down to the nitty gritty physics of it all, a brief overview should do. Essentially, the radiation from the sun is a tremendous energy source, emitting up to 1000 watts of energy per square meter of Earth in a single day.

The materials in solar cells make them photovoltaic (PV), meaning they are able to convert light to energy. When light strikes the PV cell, its energy is passed along to a semiconductor, thereby generating a current. There’s a good deal more complexity involved in the process but essentially that’s it.

Making It Work for You

There are a number of issues to consider and obstacles to overcome in installing solar cells that work properly, such as:

  • Angle and Orientation – Ideally PV cells should be directed south, at an angle that is as close to the latitude of their location as possible. All sources of shade and other obstructions must be removed for the sake of efficiency.
  • Storage and Backup – The sun doesn’t shine all the time, so you will need a backup system in place. Some options include connecting your home to the power grid, using deep cycle batteries to store energy for use later, or installing a backup generator.
  • Current Inversion – The current produced by the photovoltaic process is DC, so in order to be used like “regular” electricity from a wall socket, it needs to be converted to AC. This means installing an inverter as part of the system. Some PV cells come with invertors built in.

Installing a solar system can be a clean and budget-friendly idea, but it can also be somewhat complicated. Proper materials and installation are vital to proper functioning, so consult with a professional if you are in doubt.

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