How Solar work?
Solar energy is an infinitely renewable resource that uses the sun's rays to generate electricity for use in your home. By going solar, you can reduce your energy costs and also lower your dependence on fossil fuels, thereby making your own contribution to a cleaner environment.
A residential solar-energy system uses solar modules, made up of photovoltaic (PV) cells, to harvest the sun's energy and convert it into electricity that can be used to power your lights, appliances and other electrical devices in the home.
Types of solar systems
Grid-tied PV systems
A grid-tied system is the most common and least expensive of all residential solar systems. It allows you to use your own solar-generated electricity to save energy and reduce costs. At times when the PV system isn't producing electricity, such as at night, electricity is provided by the utility company's grid, or network of power stations.
One of the benefits of a grid-tied system is that any excess electricity produced by your solar system can be fed back to the grid through a process known as net-metering. With net-metering, which is available in most areas, when you use electricity from the grid your meter spins forward. The less electricity you use from off the grid, the slower your meter spins. Even better, when you are feeding electricity back to the grid, your meter spins backwards!
Stand-alone PV systems
Stand-alone PV systems, also called off-the-grid or off-grid, operate independently from the utility grid, providing all of the electricity needed in the home. Stand-alone systems are much more expensive than grid-tied systems. However, for homes located in remote areas without utility service, or where installing power lines would be extremely costly, a stand-alone system is a good option.