KOHLER has taken a leading edge of total solutions for residential, commercial and industrial standby/emergency power, distributed power, recreational power, rental, power for special events and more. Kohler's commitment to innovative products, world-class engineering, responsive after-sale support and unmatched value is stronger than ever.

The Decision-Maker 550 (DEC550)

The DEC 550 controller provides complete compatibility with selected engine Electronic Control Module (ECM) and non-ECM equipped generator set engines.

Operating Characteristics:
  • Power source with circuit protection: 12- or 24-volt DC.
  • Power drain: 700 milliamps (400 milliamps without panel lamps).
  • Humidity range: 5% to 95% noncondensing.
  • Operating temperature range: -40oC to +70oC (-40oF to 158oF)
  • Storage temperature range: -40oC to +85oC (-40oF to 185oF)
  • Dimensions (mm): 460 mm wide x 275 mm high x 291 mm deep

Standard Features:

  • Meets requirements of NFPA 99 and NFPA 110, Level 1
  • UL 508A Listed
  • Vacuum fluorescent digital display and keypad
  • Two-line display of 20 characters provides information in English or metric units
  • Communicate directly with PC via a network or modern configuration
  • Supports Modbus® RTU (Remote Terminal Unit), an industry standard open communication protocol



Operating Characteristics:

  • Power source with circuit protection: 12- or 24-volt DC
  • Power draw: 220 milliamps in system ready mode (or 200 milliamps without panel lamps)
  • Humidity range: 5% to 95% noncondensing
  • Operating temperature range: -40oC to +70oC (-40oF to +158oF)
  • Storage temperature range: -40oC to +85oC (-40oF to +185oF)
  • Dimensions: 461 mm wide x 247 mm high x 297 mm deep

Standard Features:

  • Supports Modbus RTU (Remote Terminal Unit communication protocol via RS-485 networks.
  • Supports Modbus® TCP (Transmission Control Protocol) via Ethernet (Converter GM41143-KP1 required).
  • Supports CANbus J1939 communication protocol for ECM engines.
  • Contains microcomputer-based logic with a ROM (read-only memory)-based control algorithm.
  • Upgradeable software for new system functionality.
  • Provides over-speed protection, cool-down mode and a selectable crank mode.
  • Meets the National Fire Protection Association requirements of NFPA 99 and NFPA 110 with additional accessories. NFPA 110, Level 1 requirements typically apply to health care facilities; NFPA 110, Level 2 requirements apply to less-critical applications
  • Uses conformal coated circuit boards for environmental durability.


Decision Maker: DEC1000


  • The KOHLER DEC1000 controller is standard on our 7.5 to 275 kVA generator sets, except kV range.
  • Controller has a polycarbonate front panel and an LCD screen
  • Offers user-friendly design with high quality features for simple, reliable control of the generator.
  • Operates in either manual or automatic mode

Decision Maker: DEC4000


  • Integrated maintenance monitoring programs (on-screen display of future maintenance operations).
  • Built-in troubleshooting tool guides the user in the event of any alarms or faults.
  • Ability to send e-mail, SMS or Fax in the event of any alarms or faults as an option.
  • Optional tropical insulation of the circuit boards to provide protection in extremely humid conditions.
  • Compliance with various requirements or regulations (CE, UL, etc.).
  • Screen with contrast adapted to all types of lighting.
  • Five languages featured, with numerous other optional languages.
  • Remote monitoring and field updates via USB connection.