MidNite Little SOB 120VAC Array Shutoff Transmitter

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Quick Overview

  • 120VAC array shutoff transmitter
  • Operates on 12 to 16 VDC 200mA power supply
  • 90 – 305VAC
  • A receiver is placed at the end of each string. Up to six strings
  • Warranty: 5-years
  • MidNite Little SOB 120VAC Array Shutoff Transmitter

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    MidNite Solar Little Shut-Off Box system

    The MidNite Little Shut-Off Box system is a simple rapid shutdown system that does not require any extra wiring between the grid tie inverter and the PV array. One receiver is used with each inverter to meet NEC 2014 and NEC 2017 code up to the end of 2018. One transmitter can be used with up to six strings. To meet the 2017 NEC code starting in 2019 one receiver is installed per module. The transmitter sends a keep-alive signal over the PV output circuit to tell the receivers to turn on. When the transmitter is disconnected from power, or by a separate shut off button, it turns off and the signal is interrupted and the receivers turn off. Safety is enhanced since any time the transmitter is not on, or should fail, the array will be shut down. Restoring power to the transmitter will turn the system back on.

    The MNLSOB-T1-600 transmitter is powered by a 250 mA 12 volt DC power supply. The MNLSOB-T1-AC transmitter is powered a 90 to 305 volt AC source drawing 3 watts. The MNLSOB-R1-600 is the receiver unit installed at the array and wired into any of the modules in a string for shutdown, or for module level shutdown onto each module. It is rated for a string voltage up to 600 VDC and modules with maximum 80 Voc each. The MNLSOB-R1-1000 is the same as the 600 volt unit but made to work in a string up to 1000 VDC.

    The MidNite SOB is a simple to install, low cost rapid shut down system designed to comply with 2014 as well as 2017 NEC.

    The system uses a receiver at the module that wires in just like an optimizer and a transmitter that is installed in or near the inverter. The installer does not need to install any other wiring between the transmitter and receiver. The system is fail safe, if the receiver does not sense the keep alive data stream from the transmitter, it turns off and opens the circuit.
  • Operates on 12 to 16 VDC 200mA power supply
  • 90 – 305VAC
  • A receiver is placed at the end of each string. Up to six strings

    Note: At the present time this system does not work with charge controllers, only with grid tie inverters.


    Series MNLSOB
    Manufacturer Part Number MNLSOB-T1-AC
    Warranty 5-years
    Description MidNite Little SOB 120VAC array shutoff transmitter
    Length 5.75  IN
    Width 4.38  IN
    Height 2.25  IN
    Weight 1.0  LB
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