OutBack FLEXmax FM60 / FM80 / FM100 MPPT Solar Charge Controller
OutBack FLEXmax FM60 / FM80 / FM100 MPPT Solar Charge Controller Outback20Flex20Max20FM20-20Iron20Edison.jpg Outback_FM100_Radian_Lithium_Battery-IronEdison2028529.jpg Outback_FM100_Radian_Lithium_Battery-IronEdison20281329.jpg Outback_FM100_Radian_Lithium_Battery-IronEdison20281429.jpg

OutBack FLEXmax FM60 / FM80 / FM100 MPPT Solar Charge Controller


The FLEXmax family of charge controllers is the latest maximum power point tracking (MPPT) charge controllers from OutBack Power Systems.



The original maximum power point tracking (MPPT) charge controller, the FLEXmax, increases PV array yield b y up to 30% compared to non-MPPT controllers. FLEXmax charge controllers can operate at their maximum rated current in ambient temperatures up to 104 °F (40 °C) and can be used with battery systems from 12 to 60 VDC with PV open-circuit voltage as high as 150 VDC. The controller’s set points are fully adjustable to allow use with a variety of battery types and charging profiles.

The FLEXmax FM60 and FM80 come standard with a four-line, 80-character backlit LCD screen that displays PV system performance with a 128-day history and can also be used for programming and monitoring system operation. Both controllers have a programmable AUX relay that can be used for control functions such as battery-enclosure fans, generator starting, or load control. The AUX output is 200 mA at 12 VDC. Use it to power a separate relay with a 12 VDC coil if you need to control more current or to control voltages (AC or DC) other than 12 VDC.

OutBack Power’s new FM100 medium-voltage charge controller accepts higher voltages from PV arrays to allow for longer wire runs with reduced wire sizes. It can be used to charge 24 or 48 VDC battery systems from PV arrays with voltage up to 290 VDC, but can withstand voltages up to 300 VDC without damage. Output is rated at 100 A at 25°C (with deration to 80 A at 40°C), with four-stage charging and an operating temperature range of -20 °C to +60 °C. NEMA 3R design allows for outdoor installation.

The FM100 can be used in negative, positive, or floating ground systems. Ample wire bending space and oversized terminals provide easier installation with larger gauge wire, and servicing and replacing all power components can be done with the unit mounted on a wall and attached to conduit. It has integrated PV ground fault detection, interruption and indication, eliminating the need to have an external GFP device. Built-in AUX relay has a 12 VDC output of up to 250 mA.

As the FM100 has no onboard display, an OutBack Power MATE3s is required to program this controller, access the 128-day data-logging history and the programming and monitoring system functions.

The RTS remote temperature sensor is standard with the FM100; and is optional with the FM60 and FM80. FLEXmax charge controls connected to an OutBack inverter system with a HUB can use the system RTS connected to the master inverter.

All FLEXmax charge controllers are covered by a 5-year standard warranty and are listed to UL 1741 and C22.2 No. 107.1 for the U.S.A. and Canada. The FM100 is also listed for IEC 62109-1.

Additional information

Weight 12 lbs

FLEXmax FM60 (150VDC), FLEXmax FM80 (150VDC), FLEXmax FM100 (300VDC)