Solar Energy Systems: How They Work. The sun is already expelling incredible amounts of energy, so why not put it to use? With the Lennox® SunSource® Energy System we carry at PWA Heating & Cooling Inc in Plainfield, you can decrease your dependence on oil and gas and see lower 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, 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, meaning it’s connected to your utility company’s power grid or power stations. Grid-tied lets you use your solar energy system to power your home. On occasions when the system isn’t creating electricity, your home will receive power through the utility grid. Additionally, when your system produces more electricity than you will use, it will be fed back into the grid through a process called net-metering. With net-metering, your meter spins forward if you’re using electricity from the grid and backward when you’re putting your SunSource System’s electricity 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 an alternative for those in remote areas without utility service, however they’re much more expensive. A stand-alone system is not tied to a utility grid and provide for the entirety of a home’s energy consumption needs. Ready to go solar? Call PWA Heating & Cooling Inc at 815-768-6656 or set up an appointment online. We’re able to help with all your Plainfield area solar energy system needs.