What protections does the PowerBlock 250W Inverter have?

PROTECTIONS

Overload and short circuit on the AC output side

  • Overload: If there is a continuous overload of 110% to 115% for 2 to 3 sec, the
    output voltage will be shut down. Status LED on the front panel of the unit will
    turn Orange, the Status LED on the GFCI outlet will be OFF and buzzer alarm
    will sound. The unit will be latched in this shut down condition and will require manual
    reset. To reset, switch OFF the unit using the ON/OFF Switch, wait for 3 minutes
    and then switch ON the unit again. Before switching ON, determine and remove the cause
    of overloading.
  • Short circuit condition will be detected when the AC output voltage drops to 80VAC or lower over a period of up to 5 sec. The AC output voltage will be shut down thereafter. Status LED on the front panel of the unit will turn Orange, the Status LED on the GFCI outlet will be OFF and buzzer alarm will sound. The unit will be latched in this shut down condition and will require manual reset. To reset, switch OFF the unit using the ON/OFF Switch, wait for 3 minutes and then switch ON the unit again. Before switching ON, determine and remove the cause of short circuit.
  • Please note that the maximum input current of this device is 10A. Sustained load rating may change based on environmental factors such as ambient temperature.
  • To reset the breaker, disconnect the power source and push the breaker switch.

WARNING ALARM - LOW DC INPUT VOLTAGE

  • The voltage at the DC input terminals will be lower than the voltage at the battery
    terminals due to voltage drop in the battery cables and connectors. The drop in the
    voltage at the DC input terminals of the inverter could be due to lower battery terminal
    voltage or due to abnormally high drop in the battery cables if the cables are not thick
    enough (Please see Section 8.4.3). If the voltage at the DC input terminals drops to 21.0V ± 0.2V, a buzzer alarm will be sounded. The Status LED on the front panel of the unit and the Status LED on the GFCI will continue to be GREEN and the AC output voltage would continue to be
    available. This warning buzzer alarm indicates that the battery is running low and that
    the inverter will be shut down after sometime if the voltage at the inverter terminals
    further drops to 20V ± 0.2V.

LOW DC INPUT VOLTAGE SHUT DOWN

  • If the voltage at the DC input terminals drops to 20V, the AC output is shut down. Buzzer alarm is sounded. The Status LED on the front panel of the unit will turn Orange. The Status LED on the GFCI will be OFF.
  • The unit will reset automatically when the DC input voltage rises to 23.0V ± 0.5V.

HIGH DC INPUT VOLTAGE SHUTDOWN

  • If the voltage at the DC input terminals rises to 33.0V, the inverter will be shut down temporarily. Buzzer alarm will be sounded. The Status LED on the front panel of the unit will turn Orange. The Status LED on the GFCI will be OFF.
  • The unit will be reset automatically when the voltage drops down to < 33.0V.

OVER-TEMPERATURE SHUT DOWN

  • In case of failure of the cooling fan or in the case of inadequate heat removal due to
    higher ambient temperatures / insufficient air exchange, the temperature inside the unit
    will increase. The temperature of a critical hot spot inside the inverter is monitored
    and at 90° ± 5°C, the AC output of the inverter is shut down temporarily. Buzzer alarm will be sounded. The Status LED on the front panel of the unit will turn Orange. The Status LED on the GFCI will be OFF.
  • The unit will automatically reset after the hot spot has cooled down to 65° ± 5°C.

GROUND FAULT/ LEAKAGE PROTECTION

  • AC Output is supplied through NEMA 5-20R Self Monitoring GFCI Duplex Receptacle. The GFCI will trip if there is 6 mA leakage/ Ground fault on the load side or, if Neutral and Ground are bonded on the load side. When tripped, the Status LED will be switched OFF. Remove the cause of tripping. Switch ON the inverter if OFF and then, press the "Reset Button" on the GFCI to reset (GFCI will not reset if the inverter is OFF and there is no AC voltage on the internal Line Side of the GFCI).

REVERSE POLARITY AT THE DC INPUT TERMINALS

  • The Positive of the battery should be connected to the Positive DC input terminal of the inverter and the Negative of the battery should be connected to the Negative DC input terminal of the inverter. A reversal of polarity (the Positive of the battery wrongly connected to the Negative DC input terminal of the inverter and the Negative of the battery wrongly connected to the Positive DC input terminal of the inverter) will trip the external resettable breaker. If the DC side fuse is blown, the inverter will be dead. The Status LED on the front panel of the unit and the Status LED on the GFCI will be switched OFF and there will be no AC output.
  • To reset the breaker, disconnect the power source and push the breaker switch.
  • Reverse polarity connection is likely to damage the DC input circuitry. If the unit does not work after resetting the breaker, it has been permanently damaged and will require repair / replacement.
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