3.4 System Working Mode
Self-Use Mode
Self-use mode is the basic working mode of the system.
When the power generated in the PV system is sufficient, it will supply the loads in priority. The
excess power will charge the batteries first, then the remaining power will be sold to the utility
grid. When the power generated in the PV system is insufficient, the battery will supply the loads
in priority. If the battery power is insufficient, the load will be powered by the utility grid.
BACK-UP Mode
The BACK-UP mode is mainly applied to the scenario where the grid is unstable.
When the grid is disconnected, the inverter turns to off-grid mode and the battery will supply
power to the BACK-UP loads; when the grid is restored, the inverter switches to grid-tied mode.
The battery will be charged to preset SOC protection value by utility grid or PV when the system
is running on-grid. So that the battery SOC is sufficient to maintain normal working when the
system is off-grid. The purchase of electricity from the power grid to charge the battery must
comply with local laws and regulations.
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