EPH series three phase solar energy storage inverter can be used for both on grid and off grid PV systems, it integrates controller and inverter. During the daytime, the PV array generates electricity which could work under different modes providing power either to the loads, or to the grid or charge the battery according to the settings. The battery can be charged either by PV power or by grid, the power stored in the battery can be released whenever the loads require it.  Moreover ,the inverter can give three phase unbalanced output according to set up, to make a most flexible power solution.