OutBack AC Coupled
Radian Backup Kit


Only 3-5 Business Days


Line Drawing
w/ Each Solar Kit

OutBack Radian GSLC 175-AC-120/240 AC-Coupling Backup Kit

outback power
  • Pre-Engineered for Backup Power using Grid Tie Inverters
  • Utility grid blackout; the OutBack AC coupling power center with Radian GS8048A and prewired load center GSLC175-AC-120/240 power assembly that features the technologies for AC coupled backup with an existing grid tie inverter with more sophisticated inverter/chargers and battery storage capabilities that can provide off-grid performance when the utility grid power is unstable or down altogether due to outages or emergencies. This OutBack AC coupled system for backup power functionality is flooded lead acid batteries (FLA), Gel, AGM or Lithium-ion battery compatible. Radian GS8048A 48 VDC Battery Based Inverter output is 120/240VAC 33.3 AAC. The OutBack inverter produces pure sine wave clean electricity to your critical loads panel drawing power from the energy stored in a battery bank when the grid is down using your existing SolarEdge or other grid-tie inverter to recharge the battery bank. Mechanically and electrically engineered, every component has been specially selected to assure the highest performance with this safe simple-to-install backup power kit.
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What's On the Truck OutBack Power

● P/N OPRADAC-D8048A - AC Coupling OutBack Power Backup Kit

  • 2 - * Outback, Radian GS8048A Battery Based Inverter/Charger (Requires 48VDC Battery Bank) 5 Year Warranty (Technical Specifications Below)
  • 1 - * Outback, GSLC175-AC-120/240 Prewired GS Load Center (Technical Specifications Below)
  • 1 - * Outback, GSLC175-120/240 Prewired GS Load Center
  • 1 - * Outback, FlexNet DC System Monitor, FN-DC
  • 1 - * Outback, MATE3, Advanced Remote Monitor and Controller
  • 1 - * Outback, FW-MB3, Flexware MATE3 Side Mount Bracket
  • 1 - * Outback, HUB10.3, COMM MANAGER
  • 1 - Midnite Solar MNSPD300-AC Surge Protector Device (Lighting Arrester)
  • 4 - Inverter Battery Cables, Code Approved THW, 4/0 x 10' (ft.) (2 black)
  • 1 - Line Drawing; Full Instructive Three-Line Diagram of Entire DC Circuit, as Well as AC Lines to Your Main Panel.


System Normally Ships in Approximately 3-5 Business Days After Funds Clear. (Subject to Seasonal Increases) ● Line Drawing send via Email [PDF] 3 - 5 business days after funds clear.

OutBack Power Batteries are site specific options that are not included with the base package. [See Related Items Below]

OutBack Power UL-1741 the entire OutBack Radian GSLC 175-AC-120/240 AC-Coupling Center Kit is certified specifically for this application, ensuring a fully-compliant NEC operation. The universal design works well with brands and models beyond SolarEdge grid-tied inverters.

● *Some Assembly Required See Schematic Tab

Fast Installation - Just Hang on the Wall and Make the Connections


The AC output bus bar in the OutBack Radian load center is the point of common coupling for the Radian inverter output, the SolarEdge output, and the critical load center’s main bus bar during all modes of operation. When the grid is active, the Radian inverter’s AC input and output are connected via an internal transfer switch making the AC output bus bar a common connection point all the way out to the grid via the main service panel and revenue meter.

Guideline Number One: The daily critical load watt-hours shouldn’t exceed 80% of the watt-hours available from the battery bank. An off-grid system is typically designed to discharge the batteries no more than 50% per day to extend the life of the batteries. However, this assumes that the backup system will only be used a few days or perhaps a week or two per year, so discharging batteries to an 80% depth will not significantly reduce their life below what is considered the normal life cycle for a battery.

outback power


OutBack Power RECOMMENDATION - Keep the number of parallel strings of batteries to three or fewer. More than three strings of batteries will shorten your battery life due to uneven charging. That means use higher AH 6VDC or 2VDC batteries for fewer strings. Batteries in Series = Voltage is Additive; Batteries in Parallel = Ah is Additive.

The AC Coupled Off-Grid or Grid-Interactive; SolarEdge Backup Solution

OutBack PowerTechnical Specifications

Radian GS8048A Power Center ● 48 VDC Battery Based Inverter. 120/240VAC Output, Continuous Inverter AC Output Current 33.3 AAC 8,000 Watts ● Outback, Radian GSLC175-AC-120/240 Prewired AC Coupling GS Load Center with two 175A breakers, 2-pole 50A ROCB and relay board, 2-pole 120/240VAC 50A bypass breakers, dual 2-pole 120/240VAC 50A input breakers, 10 busbars. ● OutBack Power's Outback, FlexNet DC System Monitor, FN-DC is the ultimate DC system monitoring device. OutBack's integrated networked communications make valuable, usable data available from your system and viewable on an OutBack MATE3 communications device, providing you with the critical answers about your system's health, performance and efficiency.● 240 VAC Generator Compatible.

AC Coupling Theory of Operation

OutBack Radian AC coupled grid-interactive or Grid/Hybrid renewable energy systems with more sophisticated inverter/chargers and battery storage capabilities can provide off-grid performance when the utility grid power is unstable or down altogether due to outages or emergencies. The OutBack FLEXcoupled system is unique from other AC-coupling types in that its foundation is a superior split-phase inverter/charger with dual AC inputs, transfer switching, power management flexibility and multiple operational modes for a wide range of energy scenarios, and greater dynamic stability.

This allows use of a more elegant, advanced electro-mechanical coupling center, the GSLC175-AC-120/240, to achieve AC-coupling instead of relying on extra frequency circuitry, transformers and diversion loads used in conventional systems which are more costly and complex. Since the OutBack approach is more cost-effective, users have the option of investing in superior, professional-grade energy storage enjoying the utility and security of a system that meets the UL1741 standard from end-to-end.

What Happens When the Utility Grid Goes Down

During an emergency when the utility power goes down and when your solar panels are producing electricity and your inverter (s) are pushing electricity is when our OutBack AC coupling backup system really starts to shine. During a utility power outage, non back up loads are terminated in the main service panel that are not connected to the system, and the utility grid is no longer present. As a result, any excess power that the loads connected to the system’s subpanel do not consume is pushed back through the ac output of the battery-based Radian inverter via the GSLC175-AC-120/240 load center and into the battery bank.

When the sun is shining, power from the SolarEdge grid tie inverter flows to the OutBack Radian Load Center output bus bar where it is consumed by loads connected to the critical load panel. If the load is demanding more than what the SolarEdge can provide from the solar array, then makeup power flows from the grid through the main service panel, through the AC input of the Radian and on out to the output bus bar where it is “blended” with power from the SolarEdge. If more power is produced from the array than is needed by the critical loads, then the excess power moves to the main service panel where it is consumed by those connected loads, with any surplus exported to the grid.

With loss of the utility grid power, the OutBack Radian inverter opens up its internal transfer switch to the grid and goes into backup mode, becoming the new “grid source” to the SolarEdge inverter. This allows the SolarEdge to keep inverting power from the solar array and powering the critical load panel. Any shortfall of power to the loads would come from the OutBack Radian inverting power from the batteries. If solar power production is more than what is needed by the critical loads, then the excess power would flow back in an unregulated charge through the Radian inverter to the battery bank. The Radian “thinks” it is inverting DC power to provide an AC source on its output, which it does, however, any excess power from the SolarEdge is delivered at a higher voltage so it can “push” the power out to the grid if necessary. Since there is no grid to push it to, the power gets pushed back through the Radian inverter to the battery bank. If the battery bank becomes fully charged, the battery voltage will continue to rise as the charging is unregulated.

To prevent the battery bank voltage from going too high when solar production exceeds load demand, a built-in AC Coupling function in the OutBack MATE3 system controller will activate the Radian 12V Aux port, which in turn is connected to an external OutBack 12V dry contact relay. The normally open relay contacts are connected to the Power Reduction Interface (PRI) Port on the SolarEdge inverter. By closing a connection between the zero percent power pin and +5V, the power output from the SolarEdge is slowly ramped down to zero percent. Now the Radian inverter will power the loads until the battery voltage drops 0.4V below the existing voltage target, then the MATE3 commands the 12V Aux to turn off, which will cause the SolarEdge to start exporting 100 percent power again.

The OutBack Radian/SolarEdge string inverter solution is not only a simple and cost effective solution, but one that does not require blackout relays or diversion loads. Being able to control the SolarEdge inverter output with a slow ramp up and down between zero and 100 percent power is a more graceful way to modulate power without the hard stops and starts with mechanical or solid state blackout relay.

Personal Technical Advisor

Line drawing questions or just stuck? No worries we have your back and will be here to help whenever you have questions. For orders larger than $2,000.00 a Technical Sales Team Group Captain will be assigned your account. Your Technical Advisors job is to coordinate all parts and pieces of your order and to work with you throughout the process. This makes it easy for you because we will be providing you with a single contact point and single extension to call with your questions to help make the process easier.

Need Help With Permit Documents?

    tax credit Solar Permit Document Service
  • Blue Pacific Solar® permit document service is offered as a value added service for our customers only who purchase our grid-tied or off-grid packages of 18 panels [Minimum] or more. The building permit document permitting service service is available for most states to help you get through your local jurisdiction building permit process. Our team of professional designers can provide the documents, blueprints and expertise needed to work with any building department nationwide.

System Qualifies - 30% Federal Solar Tax Credit

    tax credit Federal Solar Tax Credit
  • The federal solar tax credit, also known as the investment tax credit (ITC), allows a taxpayer to claim a credit of 30 percent for a qualified system located in the USA and that is owned and used as a residence by the taxpayer.

**AC Amps; Define Your AC Current Requirements

  • **NOTE: A Single Radian inverter's continuous AC output current is limited to 33.3AAC. The issue here is that the combination of your normal loads (Not Surge Loads) might exceed the inverters output current rating (Amps Out) on larger solar systems. It is critical when you are looking at your daily power requirements you make sure the continuous AC load combination (Demand) of your power requirements is at or below the 30AAC output limit of a single Radian inverter in these kits. If your AAC out is larger than 33.3AAC, then for each inverter you add, stacked in parallel, you can increase the AAC out by 33.3AAC. (Example: 2 Radian Inverters = 66.6AAC Output)

Related Items: Batteries, Cables & Turbine

    wind turbine off-grid Primus Windpower AIR 1-AR30-10-48 Wind Turbine
  • Why some off-grid systems should include both solar AND wind? Wind speeds are highest during the winter months when solar resources are at their minimum Air density is highest in winter maximizing wind power production wind provides power during inclement weather when sunshine is not present wind provides power at night.
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