OutBack Power

Outback Power Grid-Hybrid VFXR3648A-01 Inverter/Charger

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The OutBack Power FXR series inverters are a more advanced version of the venerable FX series. These new inverters are a good choice for off-grid or, with the 24 VDC and 48 VDC inverters, can be used in a grid-tied system. They have expanded voltage ranges for use with advanced-technology batteries, and have the advanced OutBack features including Grid Zero and Offset modes.

The ventilated OutBack Power VFXR inverters offer more power in high ambient-temperature applications, and more throughput for generator-powered battery charging. The sealed, externally fan-cooled FXR is designed to be used in coastal or dusty environments.

Each inverter/charger is a multi-mode power conversion unit that includes an inverter, battery charger, and an AC transfer switch. Up to ten inverters can be stacked in parallel (120 VAC), up to eight inverters can be stacked in a series configuration (120/240 VAC), and up to nine inverters can be stacked for three-phase (120/208 VAC WYE) configurations. The 50 Hz export inverters can be stacked up to ten in parallel (230 VAC), and up to nine inverters in a three-phase configuration (230/400 VAC WYE). When stacking, all of the inverters must be the same model. The X-240 and similar transformers are not used with the FXR inverters. Due to the added control features, FXR series inverters should be deployed with the MATE3s controller (or AXS Port) and the Hub10.3. These inverters, with the MATE3s or AXS port, are compatible with OpticsRE.

VFXR inverters have a programmable, auxiliary relay output connection (AUX) that provides 12 VDC output to run cooling or ventilation fans or to operate an external relay for other functions, such as remote generator starting (two-wire). Sealed FXR inverters use this relay to power the external cooling fan, so it is not available for other uses.

The internal transfer switch is rated for 60 A. When an external source of AC power (either a generator or the utility grid) is detected at the AC in terminal on the inverter, the switch operates to transfer the loads to the external power source, and then activates the battery charger to recharge the battery bank depending on what mode is programmed. An RTS remote temperature sensor and other accessories are listed on the following pages.

Use the FlexWare 250, 500, or 1000 components with these inverters or refer to the pre-wired FLEXpower (FP) systems featuring FXR series inverters.

Inverters with "-01" version are listed to UL1741 SA (Supplement A) specifications for Grid Support Utility Interactive Inverters. 12V inverters are listed to UL1741.

Dimensions: 16.25"L x 8.25"W x 11.5"H. Listed to UL 1741 (2nd edition) and CSA 22.2 by ETL for theU.S.A. and Canada and covered by a 5-year warranty

FXR / VFXR Series
Product Highlights
  • Single-phase 120V or 230V sinewave output in 12V, 24V, or 48V versions
  • Programmable for seven different modes with generator assist
  • Modular, stackable design for up to 9 inverters in three-phase and 10 inverters in grid-tied
  • Up to 93% operating efficiency
  • Field upgradable software
  • Standard 5-year warranty with optional 10-year

The latest, most advanced features on the industry’s most trusted and proven platform—that’s the essence of OutBack’s new FXR Series of Grid/Hybrid inverter/chargers. Capable of off-grid or grid-connected operation in a single model, the FXR Grid/Hybrid inverter/chargers provide system designers with unprecedented flexibility and compatibility for nearly any power conversion scenario.

The new FXR features and technologies on the acclaimed FX platform include:

Both off-grid and grid-tied functionality in one unit

  • Seven programmable modes, including GridZero and Support Mode and built-in networked communications
  • Advanced Battery Charging (ABC) with expanded charging voltages and time parameters, enabling system designers to accommodate the specific charging profiles and algorithms of new and emerging energy storage technologies including Lithium Ion, Aqueous Ion and Flow chemistry batteries
  • Easy system upgradability in the field

FXR inverter/chargers can be paired with a MATE3 to add OPTICS RE to monitor and control system performance from any location. Multiple units may be stacked and connected with other OutBack Power electronics for more seamless system integration and the ability to function in a wide variety of applications, and system sizes. Up to nine inverters can be combined in a 3-phase system with the 12V, 24V or 48V models, and up to 36kW in a grid-tied 24V or 48V system. The exclusive modular system architecture means that increased power output is just an additional FXR inverter/charger away.

Available in sealed or vented units with NEMA type 1 die-cast aluminum chassis designed to operate in the harshest environmental conditions such as high temperatures, humidity or corrosive salt air, the FXR’s continue in OutBack’s tradition of absolute dependability in mission critical installations no matter how harsh or challenging the conditions.



Instantaneous Power (100ms) 6000VA
Surge Power (5 sec) 5400VA
Peak Power (30 min) 4000VA
Continuous Power Rating (@ 25°C) 3600VA
Nominal DC Input Voltage 48VDC
AC Output Voltage (selectable) 120VAC (100-130VAC)
AC Output Frequency (selectable) 60Hz (50Hz)
Continuous AC Output Current (@ 25°C) 30AAC
Idle Power Full: ~34W Search: ~9W Off: ~3W
Typical Efficiency 93%
CEC Weighted Efficiency 91%
Total Harmonic Distortion Typical: <2% Maximum: <5%
Output Voltage Regulation ±2.5%
AC Input Voltage Range (MATE3 Adjustable) 85 to 140VAC
AC Input Frequency Range 54 to 66Hz (45 to 55Hz
Grid-Interactive Voltage Range 106 to 132VAC
Grid-Interactive Frequency Range 59.3 to 60.5Hz
Maximum AC Input Current 60AAC
Continuous Battery Charge Output 45ADC
Maximum Battery Charging AC: 60AAC
Power: 2450VA
Advanced Battery Charging Flooded, gel, AGM, lithium-ion and flow chemistry
DC Input Voltage Range 42 to 68VDC
Accessory Ports Remote temperature sensor (included), MATE3 and HUB communications
Warranty Standard 5 year, extended 10 year available
Weight (lb/kg) Unit: 61 / 28     Shipping: 67 / 30
Dimensions H x W x L (in/cm) Unit: 13 x 8.25 x 16.25 / 21.75 x 13 x 22     Shipping: 21.75 x 13 x 22 / 55 x 33 x 56
Temperature Range Rated: -20 to 50°C     Operating: -40 to 60°C     Storage: -40 to 60°C
Relative Humidity Rating 93%
Listings/Certifications UL1741, CSA C22.2 No. 107.1, UL1778, Annex FF
RoHS Compliant Yes
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