2 System Solution User Manual
10
If the meter is abnormal or not equipped:
y
the inverter can run normally;
y
the battery can be charged, but not allowed to discharge;
y
the export power setting on the LCD display will be ineffective;
y
the DO function of optimized mode will be disabled.
2.2 Off-grid System
The utility grid must be a TN system for the off-grid application.
The system is not suitable for supplying life-sustaining medical devices. A
power outage must not lead to personal injury.
With the backup box STB5K connected into the PV ESS, the system is capable of
operating as an off-grid system to ensure an emergency power supply for
emergency appliances in the event of a grid interruption or blackout.
Also user may manually press the button on the STB5K to switch the system from
on-grid to off-grid.
Fig. 2-6 Inverter Application in an Off-grid System
The grid interruption or blackout may be caused by grid islanding, under-voltage,
over-voltage, under-frequency or over-frequency, of which the fault codes will be
displayed on the LCD screen.
Refer to “6.7 STB5K Connection (Off-grid)” for cable connections and “10.7.4
Setting the Reserved Capacity (Off-grid” for the LCD settings.
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