OutBack Power SkyBox > 5000VA 120/240 Volt Grid-Hybrid Inverter

Manufacturer Part Number: SBX5048

UL 1741 SA, CSA 22.2 No. 107.1, UL 1778, HECO Rule 14H SRD, CA Rule 21 SRD, IEEE 1547-2003, IEEE 1547.1-2005 Compliant

Full-Flexibility, Grid-Interactive/Off-Grid Inverter

Meet the True Hybrid Energy System by OutBack Power, SkyBox. Use with batteries or without. Combines the economic benefits of a grid-tied system with all the independence and self-sufficiency of an off-grid system. SkyBox redefines simplicity, intelligence, flexibility and control.

SkyBox makes smart solar simple with an advanced technology single-box design, and represents a breakthrough in the field of advanced power conversion, processing and control. The fully integrated design of the SkyBox system eliminates external charge controllers and communication boxes, significantly cutting installation time and cost. Ease-of-installation makes this energy solution ideal for installers interested in following the markets move towards battery-based systems.

Product Highlights

  • Easy and fast to install
  • Clean balance-of-systems, all in one box
  • Resilient
  • Extensive quality and reliability testing, including Highly Accelerated Life Testing (HALT)
  • Years of experience manufacturing products for fault intolerant, mission-critical applications
  • Intelligent
  • Dynamic power management
  • Ability to support any new regulations
  • Adaptable
  • Backup power and support for time-of-use optimization
  • Compliant with California rule 21 and Hawaii 14H grid support requirements

All Hybrid Inverter PV Systems will need rapid shutdown. The IMO BG10P34-11 remote shutdown button is an outdoor initiation switch that can be used to trigger PV system rapid shutdown.
IMO RSD Button BG10P34-11 > Rapid Shutdown Button compatible with APsmart Rapid Shutdown System

IEEE 1547-2018 requires the local communications interface to remain available whenever the DER is operating. This indirectly creates a requirement for the IQ Gateway not to reboot during and following a low voltage ride through event. The IQ Gateway hardware was redesigned to meet this requirement so installers must only choose from the list of supported hardware and be running software versions 7.3.460 or later to be fully compliant.


Model SBX5048-120/240
Series SkyBox
Manufacturer OutBack Power


Type Grid-Hybrid Inverter
RoHS Yes, directive 2011/65/EU
Operating Temperature Range -20 to 60C
Non-Volatile Memory Yes
Field-Upgradable Firmware Yes
Enclosure NEMA 3R
Dimensions 47" H x 21" W x 9.4" D
Weight 110.6 lbs
Warranty 5 Year
Shipping Method Freight

Grid and Loads

AC Voltage 120/240V (split-phase)
AC Frequency 60Hz
Max Continuous AC Output Power (@45C) 5000VA (derate above 45C)
Max Continuous Output Current (@ 240V) 24A @ 25C
Total Harmonic Distortion Typical: <2%
Maximum: <5%
Integrated Arc Fault Detection, Ground Fault Detection & Isolation and Monitoring Yes
Power Factor at Rated Power 1

PV Input

Max PV System Voltage 600V
MPPT Voltage Range 200-600V
Max Input Current 20A
Max Short-Circuit Current 32A
Max Backfeed Duration (to array) <8ms
Reverse-Polarity Protection Yes
CEC Weighted Efficiency >94%
Typical Inverter Efficiency >97%
Transformerless, Ungrounded Yes


Unassisted Load Support from Battery Only 5000VA
Nominal DC Battery Voltage 48V
Battery Voltage Range 42-60V
Reverse-Polarity Notification Yes

Operating Modes

Immediate Battery Backup Power Yes Grid Support (UL 1741 SA) Yes Islanding Protection Yes Net Metering Yes Non-Export Yes Maximum Independence Yes Configurable Battery Charging Parameters Yes, to allow/disallow charging from AC for compliance with local regulations. Prioritized Charging from Renewables Yes

The SkyBox hybrid grid tie inverter can be used as a grid-tie inverter with or without a battery. When used with a battery it can be used to enhance self-supply of solar energy. This is useful when net-metering, or grid feed is not available, or not advantageous financially. This system uses DC coupling for both the solar and the connection to the battery system for greater overall efficiency. The SkyBox uses any commonly available 48 VDC battery bank, any lead type, flooded, AGM, or gel, and many Lithium batteries. PV input voltage range is 200-600 VDC, allowing longer PV strings. Compliant with California rule 21 and Hawaii 14H grid support requirements.

The system features backup power; grid support; net metering; non-export; and prioritized charging from renewables. These features can use any of the loads in the house, including those on the main service panel, what we call "primary" self-supply.Backup power is available to the loads connected to the backup loads panel, with a quick transfer time of 20ms. Backup power capacity is 5 kW. The inverter has ground fault and arc fault protection built in. CTs can be installed on the house AC lines for export control.