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4.5. Critical Load Connection (EPS function)
Critical load: in case of grid outage, if EPS function is enabled, HYD-ES inverter will work in EPS (Emergency Power
Supply) mode, utilize the PV power & energy stored in the battery to supply power to critical load via LOAD connection
port.
LOAD connection port is only for critical load connection. The power of critical loads must be less than 3000VA.
The connection procedure of LOAD port is the same as grid connection (Fig. 14).
Change-over positions
The changeover switch is necessary.
While checking/repairing critical load, make sure change-over switch is at position 0.
While checking/repairing HYD-ES inverter, make sure change-over switch is at
position 0 & HYD-ES inverter is disconnected from grid.
Under normal conditions: change-over switch is at position 1. HYD-ES inverter can supply power to critical load
in case of blackout.
If the HYD-ES inverter is faulty, manually change the switch to position 2. Grid will supply power to critical load.
Fig. 15 Change-over Switch connections
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