An Off-Grid type of system has both battery backup and connection to the public utility grid; however, the excess energy produced is not exported to the grid. This system is highly dependable as it guarantees 24/7 power supply to the consumer. The chance of a power outage is negligible. This is a standalone system that does not require the approval of the Electricity Board.

An off-grid system is not connected to the electricity grid and therefore requires battery storage. Off-grid solar systems must be designed appropriately so that they will generate enough power throughout the year and have enough battery capacity to meet the home’s requirements, even in the depths of winter when there is generally much less sunlight. The high cost of batteries and off-grid inverters means off-grid systems are much more expensive than on-grid systems and so are usually only needed in more remote areas that are far from the electricity grid. However battery costs are reducing rapidly, so there is now a growing market for off-grid solar battery systems even in cities and towns.