An off-grid system is not connected to the electricity grid, and therefore requires battery storage. In an off-grid system a solar technician needs to design a system that has enough power generation and battery storage to meet the home’s requirements even in the depths of winter when there is not much sunlight.

The current cost of batteries means that off-grid systems and comparatively more expensive than on-grid systems, and so are usually only found in remote areas that are far from any electricity grid