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FLEXmax 60/80

FLEXmax 60/80

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Product Highlights

  • Maximum Power Point Tracking (MPPT)
  • Active cooling and intelligent thermal management cooling
  • Ambient temperatures as high as 104°F (40°C)
  • Built-in, backlit 80 character display
  • Integrated OutBack network communications

The FLEXmax family of charge controllers is the latest innovation in Maximum Power Point Tracking (MPPT) charge controllers from OutBack Power.

The innovative FLEXmax MPPT software algorithm is both continuous and active, increasing your photovoltaic array power yield up to 30% compared to non-MPPT controllers. Thanks to active cooling and intelligent thermal management cooling, both FLEXmax charge controllers can operate at their full maximum current rating, 60 Amps or 80 Amps respectively, in ambient temperatures as high as 104°F (40°C).

Included in all of the FLEXmax Charge Controllers are the revolutionary features first developed by OutBack Power, including support for a wide range of nominal battery voltages and the ability to step-down a higher voltage solar array to recharge a lower voltage battery bank. A built-in, backlit 80 character display shows the current status and logged system performance data for the last 128 days at the touch of a button. The integrated OutBack network communications allows FLEXmax series Charge Controllers to be remotely programmed and monitored via a MATE system display and provides unrivaled complete system integration.

FLEXmax MPPT Charge Controllers are the only choice when you demand a high performance, efficient and versatile charge controller for your advanced power system.


The FLEXmax Extreme Charge Controller can not only go anywhere, it can also get there faster by saving precious installation time. It is a fitting companion to OutBack’s renowned sealed FX inverter/charger line and demonstrates the company’s ongoing commitment to providing clean, reliable power anywhere it has the potential to transform lives.

Technical Specifications & Variants


  •   FLEXmax 80 Specifications FLEXmax 60 Specifications
    Nominal Battery Voltages 12, 24, 36, 48, or 60 VDC (Single model - selectable via field programming at start-up) 12, 24, 36, 48, or 60 VDC (Single model - selectable via field programming at start-up)
    Maximum Output Current 80 amps @ 104° F (40°C) with adjustable current limit 60 amps @ 104° F (40°C) with adjustable current limit
    Maximum Solar Array STC Nameplate 12 VDC systems 1250 Watts / 24 VDC systems 2500 Watts / 48 VDC systems 5000 Watts / 60 VDC systems 6250 Watts 12 VDC systems 900 Watts / 24 VDC systems 1800 Watts / 48 VDC systems 3600 Watts / 60 VDC Systems 4500 Watts
    NEC Recommended Solar Array STC Nameplate 12 VDC systems 1000 Watts / 24 VDC systems 2000 Watts / 48 VDC systems 4000 Watts / 60 VDC Systems 5000 Watts 12 VDC systems 750 Watts / 24 VDC systems 1500 Watts / 48 VDC systems 3000 Watts / 60 VDC Systems 3750 Watts
    PV Open Circuit Voltage (VOC) 150 VDC absolute maximum coldest conditions / 145 VDC start-up and operating maximum 150 VDC absolute maximum coldest conditions / 145 VDC start-up and operating maximum
    Standby Power Consumption Less than 1 Watt typical Less than 1 Watt typical
    Power Conversion Efficiency 97.5% @ 80 Amps in a 48 VDC System - Typical 98.1% @ 60 Amps in at 48 VDC System voltage - Typical
    Charging Regulation Five Stages: Bulk, Absorption, Float, Silent and Equalization Five Stages: Bulk, Absorption, Float, Silent and Equalization
    Voltage Regulation Set points 10 to 80 VDC user adjustable with password protection 10 to 80 VDC user adjustable with password protection
    Equalization Charging Programmable Voltage Setpoint and Duration - Automatic Termination when completed Programmable Voltage Setpoint and Duration - Automatic Termination when completed
    Battery Temperature Compensation Automatic with optional RTS installed / 5.0 mV per °C per 2V battery cell Automatic with optional RTS installed / 5.0 mV per °C per 2V battery cell
    Voltage Step-Down Capability Can charge a lower voltage battery from a higher voltage PV array - Max 150 VDC input Can charge a lower voltage battery from a higher voltage PV array - Max 150 VDC input
    Programmable Auxilary Control Output 12 VDC output signal which can be programmed for different control applications
    (Maximum of 0.2 amps DC)
    12 VDC output signal which can be programmed for different control applications
    (Maximum of 0.2 amps DC)
    Status Display 3.1" (8 cm) backlit LCD screen - 4 lines with 80 alphanumeric characters total 3.1" (8 cm) backlit LCD screen - 4 lines with 80 alphanumeric characters total
    Remote Display and Controller Optional Mate or Mate2 with RS232 Serial Communications Port Optional Mate or Mate2 with RS232 Serial Communications Port
    Network Cabeling Proprietary network system using RJ 45 Modular Connectors with CAT 5e Cable (8 wires) Proprietary network system using RJ 45 Modular Connectors with CAT 5e Cable (8 wires)
    Data Logging Last 128 days of Operation - Amp Hours, Watt Hours, Time in Float , Peak Watts, Amps, Solar Array Voltage, Max Battery Voltage Min Battery Voltage and Absorb for each day along with total Accumulated Amp Hours, and kW Hours of production Last 128 days of Operation - Amp Hours, Watt Hours, Time in Float , Peak Watts, Amps, Solar Array Voltage, Max Battery Voltage Min Battery Voltage and Absorb for each day along with total Accumulated Amp Hours, and kW Hours of production
    Hydro Turbine Applications Consult factory for approved Turbines Consult factory for approved Turbines
    Positive Ground Applications Requires two Pole Breakers for switching both positive and Negative Conductors on both Solar Array and Battery Connections (HUB-4 and HUB-10 can not be used for use in positive ground applications) Requires two Pole Breakers for switching both positive and Negative Conductors on both Solar Array and Battery Connections (HUB-4 and HUB-10 can not be used for use in positive ground applications)
    Operating Temperature Range Minimum -40° to maximum 60° C
    (Power capacity of the controller is automatically derated when operated above 40° C)
    Minimum -40° to maximum 60° C
    (Power capacity of the controller is automatically derated when operated above 40° C)
    Environmental Rating Indoor Type 1 Indoor Type 1
    Conduit Knockouts One 1" (35mm)on the back; One 1" (35mm) on the left side; Two 1" (35mm) on the bottom One 1" (35mm)on the back; One 1" (35mm) on the left side; Two 1" (35mm) on the bottom
    Warranty Standard 5 year / Available 10 Year Standard 5 year / Available 10 Year
    Weight - Unit 12.20 lbs (5.56 kg) 11.65 lbs (5.3 kg)
                - Shipping 15.75 lbs (7.10 kg) 14.55 lbs (6.4 kg)
    Dimensions - Unit 16.25" x 5.75" x 4" (41.3 x 14 x 10 cm) -
    (H x W x D)
    13.5 x 5.75 x 4" (40 x 14 x 10 cm)
                       - Shipping 21" x 10.5" x 9.75" (53 x 27 x 25 cm) 18 x 11 x 8" (46 x 30 x 20 cm)
    Options Remote Temperature Sensor (RTS), HUB 4,
    HUB 10, MATE, MATE 2
    Remote Temperature Sensor (RTS), HUB 4,
    HUB 10, MATE, MATE 2
    Menu Languages English & Spanish English & Spanish

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