GSCM: Generator Start Control Module (Rev. C 5.13)

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Product Overview

Contact for the proper hookup diagram.  Please include the generator make & model, inverter brand, & battery bank voltage.

Honda EXXXXXIS Series requires a GSCM-mini-i

Currently shipping Code Version: 5.13.  

The Generator Start Control Module (GSCM) is a field-programmable microprocessor-based generator-starting controller that receives start commands from the 12-volt output from an OutBack FX inverter auxiliary output, a user-supplied switch, an auxiliary relay in an inverter, a voltage controlled relay, a timer or any user-supplied contact closure. It automatically controls a gas/propane or diesel powered generator or pump, and it is totally sealed for harsh environment operation.

The GSCM provides a normally open relay contact to start the engine and disconnect the starter when a minimum generator frequency output is measured.  It monitors the generator operation, shutting it down if one of several fault conditions is detected.  LEDs are flashed to indicate the cause of the shutdown.  Manually resetting the GSCM removes the lockout and allows the generator to restart if called.  The GSCM is powered by 12 to 24 volts DC from a battery bank and will start generators for 12 to 48V systems.  For 48V systems, the GSCM must be powered by a 24V-or-less tap on the 48V battery bank.  The GSCM provides a 30-day exercise function which can be synchronized with a photovoltaic input to only start each 30-day period at the beginning of the solar charge day.  

  • GSCM Rev. C set up adjustments is now accomplished with three push buttons: Change/ store, menu up and menu down.
  • GSCM Rev C-4.5HC has all adjustments hard coded with set up mode disabled.
  • GSCM Rev C-5.13 added a stop command after each starting attempt to ensure generator is not already running before trying to start a second or third time.

The GSCM is also available in a mini version.  A 2 to 3 wire start, but not programmable.  See GSCM-mini 60Hz (USA & Canada), GSCM-mini-i or GSCM-mini-d. 

Dimensions:  W: 5.5” x H: 1.5" x D: 3.3"


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  • 5
    GSCM Start Control Module

    Posted by Peter Swenson on Dec 14th 2021

    First, I have to say that the support from Abner Jenkins and the Engineering Department at Atkinson was absolutely outstanding. I received personalized support and the module that we have now (finally) installed works perfectly. It was custom wired for our specific generator and transfer switch, and works just as planned. The installation is in Mexico, and knowing that I had the right parts for the application was a worry. I can't say enough about the positive experience and will recommend Atkinson to everyone in our small community, as we have to rely on backup generators quite a bit. Thanks Again!!

  • 5
    Works Flawlessly

    Posted by Unknown on Jul 3rd 2019

    Fantastic solution. Powers-up the generator on the Yacht to recharge batteries for House, Inverter and Start. Great Solution.