Solar Energy Systems: How They Work. The sun is already giving off incredible amounts of energy, so why not put it to use? With the Lennox® SunSource® Energy System we have available at Oak Grove Heating & Air Conditioning in Hattiesburg, you can decrease your dependence on oil and gas and lower your utility bills. But how exactly does this happen? The simplest way to explain a solar energy system is that the system uses solar modules, which are made up 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 offer 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 generating electricity, the utility grid will supply power to your home. Additionally, when your system produces an excess amount of electricity, 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 easier to afford are only available when your system is grid-tied. Stand-alone PV systems are another option for those in remote areas without utility service, but they cost a lot more. A stand-alone system is not connected to a utility grid and provide for all of a home’s energy needs. Ready to go solar? Call Oak Grove Heating & Air Conditioning at 601-292-9763 or set up an appointment online. We’re ready to help with all your Lamar County area solar energy system needs.