If the alarm occurs occasionally, the possible
cause is that the electric grid is abnormal
occasionally. automatically returns to normal
operating status when the electric grid’s back
to normal.
If the alarm occurs frequently, check whether
the grid voltage/frequency is within the
acceptable range. If no, contact SOFAR
technical support. If yes, check the AC circuit
breaker and AC wiring of the HYD-ES inverter.
If the grid voltage/frequency is within the
acceptable range and AC wiring is correct,
while the alarm occurs repeatedly, contact
SOFAR technical support to change the grid
over-voltage, under-voltage, over-frequency,
under-frequency protection points after
obtaining approval from the local electrical
grid operator.
If you confirm that AC wiring is correct & grid
voltage/frequency is within acceptable
range, the alarm still occurs repeatedly, try to
change country code to 22. Then restart HYD-
ES inverter to see if problem is solved.
If the alarm occurs occasionally, wait a while
to see if the problem is solved.
If the alarm occurs frequently, check whether
the battery overvoltage setting is inconsistent
with the battery spec and contact SOFAR
technical support.
Check whether too many PV modules are
series connected in a PV string, thus the
voltage (Voc) of the PV string is higher than
the maximum input voltage of HYD-ES
inverter. If yes, adjust the number of series
connected PV modules to decrease the
voltage of the PV string to fit the input
voltage range of HYD-ES inverter. HYD-ES
inverter will automatically returns to normal
operating status after correct adjustments
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