OutBack Power FM100 FLEXmax 100 MPPT Charge Controller

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Pricing is an estimate, kits are customized for each building variation.
Pricing does not include freight shipping. Request a shipping quote and get a free roof layout.

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.

OutBack network communications and OPTICS RE compatibility allows the FLEXmax 100 to be remotely programmed, monitored and controlled via any internet connected device providing unrivalled 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 
  • Updated MPPT software algorithm improves energy harvest vs other controllers 
  • 300VDC open-circuit voltage limit enables 2-string configuration that minimizes BOS 
  • Fully OutBack network integrated and programmable 
  • Programmable auxiliary control output for smart load controls 
  • Up to 99% efficiency 
  • Standard 5 year warranty upgraded to 7,000 W of nameplate solar power at 48V

  • Specifications

    Nominal Battery Voltages: 24, 36, 48 VDC

    Maximum Output Current: 100A

    Maximum Array (STC Nameplate): 3500W / 5250W / 7000W (charging output limited to 100A at battery voltage)

    Battery Temperature Compensation: Adjustable from 2mV/cell/°C to 6mV/cell/°C

    Warranty: 5 years

    Dimensions: 22 x 8.8 x 6 in / 55.9 x 22.4 x 15.2 cm

    Weight: 18.3 lb / 8.3 kg

    Customize my box

    Customize My Box

    We'll custom design this system for you and calculate how many solar panels you need to meet your goals.
    Request customized kit