Solar panels use a pretty basic scientific concept, called the photovoltaic effect, to turn sunlight into the electricity we use to power our homes.
Solar cells consist of layers of silicon that turn sunlight into electricity, but it takes more equipment than just that to get energy from the sun into your toaster. Inverter Solar Pump
You've probably wondered what kind of magic in solar panels converts sunlight into electricity.
It's not magic. It's science. Specifically, it's the photovoltaic effect. This phenomenon relies on the interaction between sunlight and the semiconductive materials in the solar cells to create electricity.
As inflation continues eroding the dollar's value, harnessing sunlight and converting it to electricity becomes increasingly compelling. Installing solar panels can relieve your family financially and help you contribute to a more sustainable future.
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But how does that sunlight become electricity? Here's a look at what's inside a solar panel and how this equipment gets the energy of daylight into your appliances.
Solar panels are the key part of any solar energy system. They capture the energy of the sun and turn it into usable electricity. Here's a list of all the parts of a solar panel.
Beyond the panels themselves, other components connect the panels to the rest of your home electrical system.
Solar enthusiasts should understand two closely related phenomena -- the photoelectric effect and the photovoltaic effect -- to grasp how solar panels generate electricity, Rohit Kalyanpur, CEO of the Silicon Valley-based solar company Optivolt, told CNET.
The photoelectric effect occurs when certain materials are exposed to a specific light spectrum and absorb photons from sunlight. Upon absorption, these photons can excite or energize the electrons within the material, causing them to escape their atomic bonds. As these electrons move, they generate voltage and current.
The photovoltaic effect is very similar to the photoelectric effect, but it takes the process a step further, Kalyanpur said. In the photovoltaic effect, photons from the sunlight are absorbed by a solar cell. Those photons energize the electrons within the solar cell material, causing them to escape their atomic bonds and become free. Solar cells have a PN junction composed of semiconductor materials, which directs the flow of free electrons, generating electricity.
Having a solar panel installation does not necessarily mean your house is off-grid. An off-grid solar system is a self-contained energy system that independently produces and stores electricity.
Off-grid systems use solar panels to generate electricity and transfer it to a battery for storage. When you need electricity to run an appliance, an inverter converts the energy stored in the battery to AC electricity for power.
Grid-tied systems, on the other hand, don't stand alone. They are connected to the utility grid. They might transmit excess energy generated by the solar panels back to the electric grid, often selling it back through net metering for credits on your power bill. The primary advantage of grid-tied systems is they are significantly cheaper because you don't need to buy expensive batteries to add to the system.
You can use solar energy in several ways without fully committing to expensive electricity-generating solar installation in your home. Here are a few alternative use cases for solar energy.
Solar water heaters: A replacement for your gas or electric water heater, solar water heaters use solar energy to heat water for household use. They can help you save money and reduce energy consumption associated with any activity requiring hot water.
Solar tubes: Also known as sun tunnels or tubular skylights, solar tubes can be used to bring natural light into dimly lit areas of a home.
Solar outdoor lighting: Solar-powered lights are a popular way to illuminate outdoor spaces such as walkways, gardens and patios. They use small solar panels to charge batteries during the day, providing light at night.
Solar pool heaters: Solar pool heaters use solar collectors to heat the water in swimming pools. They are an eco-friendly way to extend the swimming season.
Solar cookers: Solar cookers use the sun's energy to cook food without gas or electricity. They are great for outdoor cooking, camping, emergencies and areas where it's difficult to access electricity or cooking gas.
Solar pumps: Solar water pumps use solar energy to pump water for irrigation, livestock and remote areas without access to the electrical grid.
Solar attic fans: These fans use solar energy to power a ventilation system that regulates the temperature in the attic. These solar fans lower electricity bills by reducing the need for air conditioning.
Solar chargers: Portable solar chargers allow users to charge their devices with solar energy. They are great for outdoor activities, camping, areas with limited access to the power grid and emergency preparedness.
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Updated Aug. 18, 2023 9:00 p.m. PT
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