OutBack FLEXmax 80

Last updated: October 24, 2026

OutBack FLEXmax 80
3.6/5#29 of 46 in MPPT solar charge controllers
3.6

For off-grid homes and cabins on 24 or 48 V, especially those built around OutBack inverters. A proven 80 A controller at a fair price.

  • 80 ACharge current
  • 12/24/36/48/60 VBattery
  • 150 V maxPV input
  • 98.4%Efficiency
  • 5 yearsWarranty
Check price at NAZ Solar Electric$527.99

Price checked October 24, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros
  • Handles about 4,000 W of panels on a 48 V bank
  • Built-in screen shows charge status without a phone
  • Ties into OutBack inverters and the MATE3s for whole-system control
  • Low price per amp for an 80 A name-brand controller
Cons
  • 150 V input limits string length
  • Fan-cooled, so there are parts to wear out
  • No Bluetooth or app without OutBack’s networking gear

How it scores

The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.

Specifications

Model numberFM80-150VDC
Charging
TypeMPPT solar charge controller
Charge current80 A
Battery voltage12/24/36/48/60 V
Custom profileYes
Temperature sensorOptional extra
Peak efficiency98.4%
Standby draw83 mA
Inputs
Max PV voltage (Voc)150 V
Max PV power (12 V)1,000 W
Max PV power (48 V)4,000 W
Monitoring and build
BluetoothNo
DisplayYes
Load outputNo
Coolingfan (active cooling)
Water resistanceIndoor Type 1
Dimensions41.3 x 14.6 x 11.4 cm (16.25 x 5.75 x 4.5 in)
Weight12.2 lb
Warranty5 years
Released2008-07

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