Solar-Roofing-Home – Grid-Tie – These rooftop systems are primarily designed to supply the generated power to the grid and also power the load. These systems will not generate power during a power failure as the inverter shut down the system to stop sending power into the grid and avoids the risk of electrocuting utility personnel who are working to repair the grid.
Grid-Interactive – This system works in conjunction with either a battery backup or diesel generator to support the load even during a power failure.
OFF-Grid – This system does not work with the grid and is designed to work only with a battery backup or diesel generator in off-grid applications The difference between the systems lies in the kind of inverter used, and the inclusion of batteries.