The term Grid refers to electricity grid that is supplied by Eskom or your Local Municipally.
Explanation on the 4 different kind of Inverters.
Only the Gried tie Inverter does not provide backup when Power is not available. All the other Inverters act as backup and can be configured in a manner that you are your own Primary Power provider and Eskom (while not needed) can be used to be secondary Power provider as backup.
- Inverter with Build in Charger.(Charge Batteries from external power source ie. Eskom as backup for Solar Panels)
- Grid Tie Inverter.(Inverter stores all Power generated from Solar Panels on the Grid with no batteries)
- Off Grid Inverter.(Inverter is totally independent from grid and Converts Power from Batteries for Normal Power use)
- Hybrid Invertor.(Build in charger , able push excess power into gird while still offering backup from batteries )