OutBack Power FM100-300VDC FLEXmax MPPT Charge Controller


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OutBack Power FM100-300VDC FLEXmax MPPT Charge Controller

The FLEXmax 100 is the latest innovation in Maximum Power Point Tracking (MPPT) charge controllers from OutBack Power.

The advanced FM100 MPPT algorithm offers increased energy harvest from the PV array than other MPPT controllers. The FLEXmax 100 delivers both higher voltage and higher power, offering improved flexibility and performance.

So with the higher voltage on this controller, instead of doing strings of 2-3 modules, like on the FM60/80 controllers, you can do strings of up to 6 or 7 60-cell modules in series.  This greatly reduces installation time and BOS costs.

OutBack network communications and OPTICS RE compatibility allows the FLEXmax 100 to be remotely programmed, monitored and controlled via any internet connected device providing unrivaled system integration.

The FM100-300VDC is a top-of-the-line high performance, efficient and versatile charge controller for your advanced power system.


  • 100A output for up to 5kW of charging
  • Compatible with 24, 36 and 48VDC battery banks
  • Minimum battery bank size, 100Ah
  • Field-replaceable cooling fan
  • Built-in ground fault protection and rapid shutdown capacitor discharge for easy code-compliant installation
  • System configures quickly with smart programming wizards (MATE3s required)
  • Monitor, command, and control over the Internet with OPTICS RE
  • 300VDC open-circuit voltage limit enables up to 6-7string configuration that minimizes BOS
  • 5 Year Warranty


FLEXmax™ 100 Specifications
Nominal Battery Voltages
24, 36, or 48 VDC
Maximum Output Current
100 amps
Maximum Input Current
64 amps
Maximum Solar Array STC Nameplate
3000W / 4500W / 6000W (charging output limited to 100A at battery voltage)
Maximum PV System Voltage
300 VDC
Operating Input Voltage Range
30VDC to 290VDC
Standby Power Consumption
About 2.5W
Power Conversion Efficiency
24V: 96%    48V: 97%
Charging Regulation
Three Stage
Voltage Regulation Set points
Absorption, float, silent and equalization
Equalization Charging Programmable start time, voltage set point and duration, automatic termination when completed
Battery Temperature Compensation
Adjustable from 2mV/cell/°C to 6mV/cell/°C
Voltage Step-Down Capability
Down convert from any acceptable array voltage to any battery voltage (example: 72VDC array to 24VDC battery)
Programmable Auxilary Control Output
12VDC output signal which can be programmed for different control applications (maximum of 0.25ADC)
Status Display
LED indicators
Remote Display and Controller

Optional MATE3s (REQUIRED)

Network Cabling
Proprietary network system using RJ-45 modular connectors
Data Logging
Last 128 days
Operating Temperature Range Ambient, -25°C to 60°C (-13°F to 140°F), output power reduced above 25°C
Environmental Rating Outdoor rated NEMA 3R Enclosure
Physical Specifications
Conduit Knockouts Bottom and Sides
Warranty Standard 5 year
Weight – Unit 18.3 lbs (8.3 kg)
– Shipping 22 lbs (10 kg)
Dimensions – Unit 22 x 8.8 x 6″ (60 x 22.4 x 15.2 cm)
– Shipping 25.5 x 12 x 10″ (64.8 x 30.5 x 25.4 cm)
Options Remote Temperature Sensor (RTS), HUB 4, HUB 10.3, MATE3s
Certifications UL 1741, CSA C22.2 No. 107.1, IEC 62109-1

Click Here for Data Sheets and Installation Instructions

Additional information

Weight 22 lbs
Dimensions 26 × 12 × 10 in


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