OutBack FM-80, 80 Amp MPPT Charge Controller


The FLEXmax 80 is the latest innovation in Maximum Power Point Tracking (MPPT) charge controllers from OutBack Power Systems. The FLEXmax 80’s innovative MPPT algorithm is both continuous and active, increasing your renewable energy yield up to 30%. Thanks to enhanced cooling, the FLEXmax 80 can operate at its full 80 amp maximum current rating in ambient temperatures as high as 104°F (40°C).

Included in the FLEXmax 80 are all of the features first developed by OutBack Power in the revolutionary MX60, such as support for a wide range of nominal battery voltages and the ability to step-down a high voltage solar array to recharge a low voltage battery. A built-in back lit display shows status information at the touch of a button. Enhanced network communications allow the FLEXmax 80 to be remotely programmed via the optional MATE system display and controller.

The new FLEXmax 80 is the only choice when you demand a high performance, efficient and customizable charge controller for your advanced power system.

FM80 MPPT Charge Controller Specifications

Nominal Battery Voltages: 12, 24, 36, 48, or 60 VDC
Maximum Output Current: 80 amps @ 104ē F (40ēC) 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 7500 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

PV Open Circuit Voltage (VOC): 150 VDC absolute maximum, 145 VDC start-up and operating maximum
Standby Power Consumption: Less than 1 Watt typical
Power Conversion Efficiency: 97.5% @ 80 Amps in a 48 VDC System - Typical
Charging Regulation: Five Stages: Bulk, Absorption, Float, Silent and Equalization
Voltage Regulation Set points: 10 to 80 VDC user adjustable with password protection

Equalization Charging: Programmable Voltage Set point and Duration & Automatic Termination
Battery Temperature Compensation: Automatic with optional RTS 5.0 mV per °C per 2V battery cell
Voltage Step-Down Capability: Max 150 VDC input PV array can charge a lower voltage battery

Programmable Auxiliary Control Output:12 VDC (0.2 amp max) programmable output signal
Status Display: 3.1” (8 cm) back lit LCD screen - 4 lines with 80 alphanumeric characters total
Remote Display and Controller: Optional Mate or Mate2 with RS232 Serial Communications Port
Network Cabling: Proprietary CAT 5e Cable (8 wires) with RJ 45 Modular Connectors

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

Hydro Turbine Applications: 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)

Operating Temperature Range: Minimum -40° to maximum 60° C
Environmental Rating: Indoor Type 1
Conduit Knockouts: One 1” (35mm) on the back; One1” (35mm) on the left side; Two 1” (35mm) on the bottom
Menu Languages: English & Spanish
Warranty: Standard 5 year

Weight Unit: 12.20 lbs (5.56 kg)
Dimensions Unit: 16.25” x 5.75” x 4” (41.3 x 14 x 10 cm) - (H x W x D)
Shipping Weight: 15.75 lbs (7.10 kg)
Shipping Dimensions : 21” x 10.5” x 9.75” (53 x 27 x 25 cm)


Remote Temperature Sensor (RTS)
HUB 10

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  • Model: FM80
  • Manufactured by: Outback

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