The FLEXmax 100 (FM100 AFCI) from OutBack Power is the most advanced MPPT charge controller technology and power solution. Designed with 15 years of experience manufacturing products for fault intolerant, mission-critical applications, OutBack’s FLEXmax 100 delivers a high quality and reliable MPPT charge controller. The FLEXmax 100 has passed extensive quality and reliability testing, including Highly Accelerated Life Testing (HALT).


The compact, outdoor-rated enclosure keeps dust and moisture from damaging internal components. With the addition of arc and ground fault protection, and rapid shutdown capacitor discharge, the FLEXmax 100 is the most versatile high power MPPT controller on the market. Configuring the FLEXmax 100 in your system is easy with 128 days of built-in data storage, smart programming wizards (MATE3s required), and connectivity with OPTICS RE, so you can monitor, command, and control from one location.


The FLEXmax 100 charges your batteries faster. This allows you to sell energy to the grid faster, and maximize your return on investment. The FLEXmax 100 has the best price to power ratio on the market.



  • Input voltage up to 300 Volts

  • 100A output for up to 6kW of charging

  • Compatible with a range of battery voltages: 24 to 60 Volts

  • Remote monitoring and control via MATE 3S and internet

  • Built-in 128 days of data logging

  • Updated MPPT software algorithm improves energy harvest vs other controllers
  • Programmable auxiliary control output for smart load controls
  • Standard 5 year warranty upgraded to 7,000W of nameplate solar power at 48V
  • Integrated arc fault circuit detection and interruption for optimized systems
  • The only fully NEC 2017 compliant charge controller solution
  • ETL Listed to UL1741, CSA C22.2 No. 107.1

  • Standard 5-year warranty

  • Made in USA


Weight: 7.3 kg (16 lbs)

Dimensions: 584 x 224 x 152 (23 x 8.8 x 6 in)



Outback Power 100A FLEXmax MPPT Charge Controller, FM100 AFCI