I don't see an Xpower 1750 listed anywhere, but the 1500 manual says this re. the fault indicator:
Low input voltage
High input voltage
Thermal shutdown
Unit overload
Output is short circuited.
Recharge the battery; check the connections
and cable. Make sure the inverter is connected to a 12 V
battery (and polarity is correct). Check the voltage regulation of the charging
system. Allow the unit to cool off. Reduce the load if continuous operation is required. Improve ventilation. Make sure the inverter’s ventilation openings are not obstructed. Reduce the ambient temperature.Reduce the load. Make sure the load does not exceed the inverter’s output rating. Remove the short circuit.
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