Hybrid solar inverters are also called on-grid battery-tied solar inverters. It is a combination of on-grid and off-grid solar inverter. The solar panel generated power can directly feed to load and charge the battery. At the same time, it can feed the excess energy generated by solar panels to the grid.
This kind of system is very effective in South Africa where power cuts and line failures are frequent. You would require a battery bank to store power for when the power goes down. Deciding on just how large to make that battery bank, depends largely on what your critical load is – the most important appliances and devices you need to keep the powered up.
These solar inverters give you additional insurance on continuous power when there is either a power failure or not enough power from the solar panels.