Solar pow Do Solar Panels Work for Your Home?
How Do Solar Panels Work for Your Home? For solar panels, the photovoltaic effect occurs when photons from the sun’s rays hit the semi conductive material (typically silicon) in the cell of the solar module. The photons activate electrons, causing them to free themselves from the semi-conductive material.
Due to the structure of a solar panel, the free electrons move in a single direction through the junction of the panel. This movement creates an electrical current that is then sent to an inverter to be harnessed by your home.
How is solar energy used in your home?
The power generated by your solar system is direct current (DC). Your inverter then captures the DC energy and transitions (or ‘inverts’) it to alternating current (AC) in order to make it in a usable state for your home.
The most common residential solar modules, or solar panels, contain monocrystalline or polycrystalline (also called multicrystalline) solar cells. Both types of cells produce electricity when exposed to sunlight, however there are some key differences between the two:
- Monocrystalline cells tend to appear darker in color, often black or dark grey
- Polycrystalline cells often appear a dark blue when exposed to light
- You may be able to see small crystalline pieces of silicon melded together to form the wafer in polycrystalline cells
- Monocrystalline cells generate higher panel efficiency
- Monocrystalline cells tend to be more expensive
There are many panel manufacturers that build panels containing both mono and polycrystalline wafers to form solar cells. These are capable of harvesting energy from a wider spectrum of light. Additionally, if space is limited on your roof or project site, a higher-efficiency, monocrystalline panel may be preferred.
Alternatively, a lower-cost, slightly less efficient, polycrystalline panel may do the job. Be sure to ask what type of cell (“mono or poly”) your home solar system design contains. Additionally, this distinction may affect the aesthetics and economics of your project.
How does sun exposure affect solar panel efficiency?
More important is that your solar panel array(s) are installed in areas that receive good insolation throughout the day. The arrays should be free from as much shading from trees or neighboring obstructions as possible. This will ensure your system is as productive as possible, given the site conditions. Further, more sun exposure means more photons hit the solar panel, thereby freeing more electrons and creating a stronger current, meaning more power for your home. Due to the need for trenching and a more comprehensive racking structure, ground-mount installations tend to be more expensive than a roof-mounted installation.
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