Solar Off-Grid and Grid-tied Systems with Battery Backup
Although they are most common in remote locations without utility service, solar off grid systems can work virtually anywhere providing electrical power. These systems operate independently from the grid to provide all of a household’s electricity. They require a battery bank to store the solar electricity for use during nighttime or cloudy weather, a charge controller to protect the battery bank from overcharge, an inverter to convert the DC PV array power to AC for use with AC household appliances, and all the required disconnects, monitoring, and associated electrical safety gear.
Stand-alone solar off-grid systems are some of the most challenging types of solar systems to design. An off grid system needs to be designed and sized to meet your specific energy and load requirements. This should be based on an average daily load in watt-hours that will be calculated from your energy usage.
Solar Grid-tied Systems with Battery Backup
This type is very similar to an off-grid system in design and components, but adds the utility grid, which reduces the need for the system to provide all the energy all the time.