How a Solar Energy System Works. If you want a more environmentally responsible home, one step is to purchase a solar energy system. After all, the sun’s energy has been provided to us in Marshall County for hundreds of years. B & G HVAC carries the Lennox® SunSource® Energy System to help you create a more efficient home that doesn’t heavily rely on oil and gas. Just how does this system work? Put simply, the system uses solar modules, made up of photovoltaic (PV) cells, to collect energy from the sun and convert it to electricity. Then, the electricity will power appliances, lights and other electrical devices in your home – from your HVAC systems to your computer. Grid-tied PV systems If you live in Marshalltown, you’re likely going to want a grid-tied PV system. These are the least costly solar energy systems, and they’re connected to your utility company’s power grid – hence the name grid-tied. This lets you use solar energy from your system when the PVs are collecting energy and use electricity from the grid at times when the system isn’t gathering energy. Additionally, grid-tied systems let your system feed additional energy back into the grid, causing your meter to spin backwards. This is the process of net-metering. The backward spin lets you save on utility expenses that are decided based on how far forward your meter has spun. It’s important to note that most solar rebates and incentives are only available if your system is grid-tied. The other option is a stand-alone PV system, which costs more. Stand-alone systems are not connected to the utility grid and are nice options when your home is in a remote location, not near a utility service or power lines. B & G HVAC in Marshalltown is happy to help with your solar energy system questions. Give us a shout at 641-812-2044 or schedule an appointment online.