Solar Energy Systems: How They Work. The sun is already generating incredible amounts of energy, so why not put it to use? With the Lennox® SunSource® Energy System we offer at B & B Heating & Cooling in Florissant, you can limit your dependence on oil and gas and reduce your utility bills. But how exactly does this happen? The most basic way to explain a solar energy system is that the system uses solar modules, which are composed of photovoltaic (PV) cells, to collect 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 have available is grid-tied, and that means it’s connected to your utility company’s power grid or power stations. Grid-tied allows you to use your solar energy system to power your home. On occasions when the system isn’t producing electricity, the utility grid will supply power to your home. And, when your system produces more electricity than you will use, 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 putting your SunSource System’s electricity 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 an alternative for those in remote areas without utility service, but they’re considerably more expensive. A stand-alone system is not linked to a utility grid and provide for the entirety of a home’s energy consumption needs. Ready to go solar? Call B & B Heating & Cooling at 314-325-7552 or create a consultation online. We’re able to help with all your St. Louis area solar energy system needs.