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Outback Flexmax 100 MPPT Solar Charge Controller - AFCI

Outback Flexmax 100 MPPT Solar Charge Controller - AFCI
Outback Flexmax 100 MPPT Solar Charge Controller - AFCI
Item code Brand name Model number Amps
OUTFLEXMAX100AF Outback FLEXmax100 AFCI 100A

Outback Power Systems

Outback FLEXmax 100-AFCI

Outback Power
FLEXmax 100-300VDC AFCI
MPPT Charge Controller

The FLEXmax 100 MPPT Charge Controller from Outback, is now updated to have integrated arc fault circuit detection and interruption for optimized systems. 

The advanced FM100 MPPT with AFCI eliminates the possibility of false arc-fault tripping, ensuring less downtime and loss of PV production.  The 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.

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.  Additionally, there will be huge labor and cost savings from not needing the external combiner box up on the roof.


  • Improved: Integrated arc fault detection and interruption for optimized systems
  • Improved: 100A output for up to 6kW of charging with up to 7kW on the PV array
  • Improved: 300VDC open-circuit voltage limit enables up to 2-4 string configuration that minimizes BOS
  • Improved: Programmable auxiliary control output for smart load controls
  • Improved: Enhanced MPPT algorithm for increased energy harvest in harsh environments (ie. freezing temps, salty/dusty, or salty/marine areas)
  • Compatible with 24, 36 and 48VDC battery banks
  • Built-in and field replaceable arc fault circuit detection and interruption (AFCI), GFCI, and cooling fan
  • Minimum battery bank size, 100Ah
  • Field-upgradeable firmware (downloadable from Outback's website)
  • System configures quickly with smart programming wizards (MATE3s required)
  • Monitor, command, and control over the Internet with OPTICS RE
  • Fully compliant with NEC 2017 RSD
  • 5 Year Warranty (Upgraded to 7000W of nameplate solar power at 48V)


FLEXmax™ 100 AFCI Specifications
Nominal Battery Voltages
24, 36, or 48 VDC
Maximum Output Current
100 amps
Maximum Input Current
64 amps
Maximum Solar Array STC Nameplate
3500W / 5250W / 7000W (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, 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 23 x 8.8 x 6" (58.4 x 22.4 x 15.2 cm)
  - Shipping 26 x 12 x 10" (66 x 30.5 x 25.4 cm)
Options Remote Temperature Sensor (RTS), HUB 10.3, MATE3s
Certifications UL 1741, CSA C22.2 No. 107.1, IEC 62109-1


Outback Power Systems

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