Here’s How Solar Panels Actually Work
You already know that solar panels convert sunlight into electricity. But how? It’s almost like magic. Well, it’s magic , but while it’s not an illusion, the science behind it – the photovoltaic effect – is fascinating. With rising heating costs as well as the effects of climate change, now is a good time to invest in solar panels for your home. Not only will you help by creating clean energy for decades to come, you will also save a significant portion of your monthly bills.
What does a solar panel system consist of?
First, let’s look at the solar panel itself. There are solar cells made from silicon – they are the main element that converts sunlight into electricity. You will then find an insulating shell of glass or polymer around it. The metal frame holds everything together, protecting the equipment from external influences. There is also a junction box that protects the diodes, wiring and electrical components. Finally, the panels use MC5 connectors, which connect all the solar panels together to form a single array.
A solar energy system consists of many different components in addition to the panel itself. These components do the work of converting, storing, or sharing the electricity generated by the solar panel. Here are some of the main components you will find:
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Inverter : The inverter is the most important part of any solar power system. By default, solar cells generate direct current or DC electricity, but most home appliances run on alternating current (AC). An inverter converts DC electricity into AC power so it can be used for lights, fans or a refrigerator.
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DC Optimizers and String Inverters : The optimizer helps each panel operate independently at maximum power. The MPPT, as it is called, is then fed into the AD inverter process.
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Microinverters : These devices monitor maximum power and convert DC to AC directly at the panel. They can help eliminate the need for a central inverter.
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Quick Shutdown Device : This is a safety mechanism that ensures the entire solar power system is safely shut down.
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Telemetry Center : This is the part that monitors the entire system and shows data to users, usually through a digital panel.
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Battery : This is not required if you are building a grid-tied solar panel system, where the generated energy feeds directly into your local grid and you earn credits for the energy you supply. But if you are building an off-grid system or your installation is in a remote area, you will need a battery to save and utilize the electricity generated.
How does the photovoltaic effect work during solar charging?
As we mentioned above, solar chargers work based on the photovoltaic effect. However, before we talk about this, you should first understand the photovoltaic effect.
The photoelectric effect is a phenomenon in which electrons are ejected from the surface of a material when light shines on it. This happens because the energy from the light photons is absorbed by the electrons, giving them enough energy to overcome the binding energy that holds them in the material. The ejected electrons are called photoelectrons. When free electrons move, they generate current and voltage.
The photovoltaic effect is similar, but here photons from sunlight are absorbed by the solar cell. The photons then charge the electrons inside the solar cell material. This frees them from atomic bonds and they become free. Solar cells have a PN junction made of semiconductor materials that directs the flow of free electrons, and this is how electricity is generated.
Should you unplug?
Simply purchasing a solar powered system doesn’t mean your home is off the grid, and you’ll be glad to know that it doesn’t have to be. You can continue to stay online by connecting to your local electricity supplier as a backup, while managing your own solar power plant.
Without a battery, electricity that is not used by your home automatically goes into the grid. How this works may depend on local laws, but there is usually a monitoring device that allows you to count the units of electricity generated, and you get credits for selling your share to the grid. This route is cheaper because you don’t have to buy an expensive battery to install in your system.
If you want, it will be connected directly to the solar energy system, where the electricity will be transmitted and stored. Then, when you need to start the appliance, the inverter converts the energy stored in the battery into AC power.