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OutBack Power FM100-300VDC-AFCI > 100 Amp 24/48 Volt Flexmax 100 MPPT Charge Controller

OutBack Power FM100-300VDC-AFCI > 100 Amp 24/48 Volt Flexmax 100 MPPT Charge Controller

Warranty: 5 Years

Stock Status:(Out of Stock)

Availability: This product is no longer available.

Description Datasheet

OutBack Power > 100 Amp 24/48 Volt Flexmax 100 MPPT Charge Controller

Includes LCD Display
Manufacturer Part Number: FM100-300VDC-AFCI


Model Flexmax 100
Series Flexmax
Manufacturer OutBack Power


Type MPPT Charge Controller
Dimensions (W x H x D) 22" x 8.8" x 6"
Weight 18.3 lbs
Shipping Method Ground

Specs: FLEXmax 100

Nominal Battery System Voltage 24 VDC / 36 VDC / 48 VDC
Maximum Continuous Output Current 100 A
Maximum Input Current (Short-Circuit) 64 A
Maximum Array (STC Nameplate) 3000W / 4500W / 6000W (charging output limited to 100A at battery voltage)
Maximum PV System Voltage 300 VDC
Operating Input Voltage Range 30 VDC to 290 VDC
Standby Power Consumption ~2.5 W
Power Conversion Efficiency 24V: 96% 48V: 97%
Peak Efficiency 24V: 97.5% 48V: 98.8%
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 Auxiliary 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 MATE3s compatible
Network Cabling Proprietary network system using RJ-45 modular connectors
Data Logging 128 days
Operating Temperature Range Ambient, -25C to 60C (-13F to 140F), output power reduced above 25C
Ingress Protection Rating IP54
Enclosure Type 3R
Maximum Altitude Rating 10,000ft
Conduit Knockouts Bottom and sides
Warranty 5 years
Options Remote Temperature Sensor (RTS), HUB4, HUB10.3, MATE3s
Certifications UL 1741, CSA C22.2 No. 107.1, IEC 62109-1
Minimum Battery Bank Size 100Ah
Charging Range (Output) 20VDC to 68VDC
Additional Features Built-in GFCI, field-replaceable cooling fan

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.


  • Up to 5000 watt of solar power charging
  • 300VDC open-circuit voltage limit
  • Built-in ground-fault protection and rapid shutdown capacitor
  • Compatible with 24, 36 and 48VDC battery banks
  • System configures quickly with smart programming wizards
    (MATE3s required)

The FLEXmax family of charge controllers is the latest innovation in Maximum Power Point Tracking (MPPT) charge controllers from OutBack Power Systems. The innovative FLEXmax MPPT software algorithm is both continuous and active, increasing your renewable energy yield up to 30% compared to non-MPPT controllers. Thanks to active cooling and intelligent thermal management cooling, the FLEXmax charge controllers can operate at their full maximum current rating, 100 amps respectively, in ambient temperatures as high as 140F (60C).

Included in all of the FLEXmax Charge Controllers are the revolutionary features first developed by OutBack Power, including support for a wide range of nominal battery voltages and the ability to step-down a high voltage solar array to recharge a low voltage battery. A built-in back lit 80 character display shows status information and logged system performance data for the last 128 days at the touch of a button. The integrated OutBack network communications allow the FLEXmax series charge controller to be remotely programmed and monitored via a MATE system display and provides unrivaled complete system integration.

The default settings of the FLEXmax 100 charge controller are for lead-chemistry batteries intended for deep discharge. These include all energy storage offered by OutBack Power as well as batteries for marine, golf-cart, and forklift applications. They also include gel-cell batteries and absorbed glass-mat (AGM) batteries. OutBack Power recommends the use of batteries designed specifically for renewable energy applications. Lithium-based batteries and other advanced battery technologies may require special charging considerations.

FLEXmax MPPT Charge Controllers are the only choice when you demand a high performance, efficient and versatile charge controller for your advanced power system.

Detailed Description

What is MPPT?

It stands for Maximum Power Point tracking.

What is the difference between a MPPT and a non-MPPT controller?

A non-MPPT controller needs an array at the same nominal voltage as your battery bank. It then connects the array to the battery to charge and disconnects it when the batteries get full. This is pretty basic, but far cheaper than hiring someone with a meter and a switch.

An MPPT controller does a little more than that. Rather than connecting an array to the battery bank, this type of controller is a DC-DC converter. It can take a higher voltage than the battery as an input, and step it down to the battery voltage. Much like a step-down transformer in AC circuits, the voltage on the output drops and the amperage is increased, providing the same power out as is coming in (ignoring efficiency, of course).

If the power is the same, what is the benefit?

A better way to look at it is that an MPPT charger is more efficient at collecting the same amount of power from an array.

If the controller is just more efficient, how can it get more power from the array?

A common misconception is that a 12 volt module will operate at 12 volts. Even a car battery, at least with the car running, will be at a higher voltage. Go ahead. Start your car. We'll wait.

If you don't have a meter handy, it is common to see the battery charging (from the alternator) at about 14VDC. At rest, a full battery will be around 12.8VDC. PV modules are similar. Their actual voltage is higher than their nominal voltage, as long as they have enough light. PV modules also operate best at certain voltage and current levels. This voltage and current is located at the Max Power Point.

Where is this Power Point and how is it tracked?

An MPPT controller finds the voltage and current that produces the highest output; the Max Power Point. If we look at a graph showing the voltage and current drawn from a PV module, we will see that it does not follow a straight line.

Also known as:

FM100 MPPT Charge Controller
FM-100 MPPT Charge Controller
FM 100 MPPT Charge Controller
Flexmax100 MPPT Charge Controller
Flexmax-100 MPPT Charge Controller
Flexmax 100 MPPT Charge Controller

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