Solar Energy Systems: How They Work. The sun is already giving off massive amounts of energy, which is exactly why you should put it to use in your home. With the Lennox® SunSource® Energy System we carry at Premier HVAC Services LLC in Greencastle, you can limit your dependence on oil and gas and reduce your utility bills. So how exactly does it work? The most basic way to explain a solar energy system is that the system uses solar modules made of photovoltaic (PV) cells to take in energy from the sun and convert it to electricity. This electricity is used to power light, appliances and electrical devices in your home. Grid-tied PV systems Grid-tied PV systems are the most common and least expensive for residential solar systems. The SunSource Energy System we carry is grid-tied, which means it’s connected to your utility company’s power grid or power stations. Grid-tied enables you to use your solar energy system to power your home. When the system isn’t creating electricity, your home will receive power through the utility grid. Additionally, when your system produces enough to power your home and then some, it will be fed back into the grid through net-metering. With net-metering, your meter spins forward if you’re using electricity from the grid and backward when you’re SunSource System’s electricity is going back into the grid. *Note: Most rebates and incentives that make a solar energy system less costly are only available when your system is grid-tied. Stand-alone PV systems are also available for those in remote areas without utility service, but they cost a lot more. A stand-alone system is not linked to a utility grid and provide for all of a home’s energy needs. Ready to go solar? Call Premier HVAC Services LLC at 717-461-8113 or create an appointment online. We’re ready to help with all your South-Central Pennsylvania area solar energy system needs.