Imagine using the power of the Sun to generate your own residential solar electricity!
Home solar power systems can help you...
For homeowners, this can all be accomplished by installing a photovoltaic solar power system.
The PV Devices generate the solar power by converting sunlight into direct-current (DC) electricity.
The Load is simply the device that uses the electricity. Your refrigerator is a good example of a load.
The BOS consists of all the equipment between the PV devices and the load. It includes the structures for mounting the PV devices, the power conditioning equipment to convert the DC electricity to alternating-current (AC) for use by the load, and batteries for storing the PV generated electricity if desired.
If you want to learn more, check out Solar Electricity Basics.
An individual solar cell doesn't generate much power. The amount varies, but it is around 1 or 2 watts. But you can increase the solar power generated by joining them together into a larger unit called a PV module. PV modules are also known as solar power panels. The power output of a PV module ranges from 10 watts to 300 watts. To generate even more power, PV modules can be combined to form a PV array.
A PV array can consist of any number of modules. This modularity makes photovoltaic systems very flexible. They are able to meet any electrical requirement, whether the amount of power needed is small or large.
But to take advantage of the electricity produced by a PV array, you need a few more components...
The BOS components enable the solar electricity to be properly applied to the load.
The exact BOS components you need will depend on the type of PV system you install.
The three most common types of photovoltaic systems for residential solar power are...
A grid-tied PV system allows you to use the electricity generated by your PV system as well as electricity from the grid. When your PV system is producing electricity, your home will be powered by solar electricity. During the times when your PV system isn't producing electricity, such as at night, your home will receive power from the grid.
Any excess electricity produced by your system can be fed back to the grid. This is known as net-metering. With net-metering, when you use electricity from the grid your meter spins forward and when you are providing electricity to the grid your meter spins backwards. This offset means you are actually receiving market rates for the electricity you provide to the grid!
For most people, a grid-tied PV system is the ideal configuration.
You get all the benefits of using your own solar electricity as well as the benefits of being connected to the grid. It is also less expensive than other types of PV systems.
A grid-tied PV system can also be supplemented with a battery backup.
Why would you need a battery backup since you are connected to the grid?
Well, grid-tied PV system inverters are designed to shut down when the grid experiences a power outage in order to protect the utility repair workers from being shocked by electricity coming from your PV array. As a result, during a power outage, you won't be able to utilize the electricity coming from your PV array.
However, if your PV system includes a battery bank, during a power outage you can utilize the energy that your PV system produced and stored in the batteries.
A grid-tied PV system with battery backup is ideal if you live in an area that has unreliable power from the grid or that experiences power outages due to natural disasters.
Stand-alone PV systems are designed to operate independently from the grid and to provide all of the electricity you need for your home.
If you have a home that is in a remote area that doesn't have utility grid service or where it would be very costly to have power lines run to your home, a stand-alone PV system would be ideal.
This type of PV system is also desirable if you are looking to go completely green with your source of electricity.
As you can see, home solar power systems give you a flexible way to harness power from the sun to generate your own pollution-free, cost-saving solar electricity!
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