Installation

Multiple-Inverter Installations (Stacking)

Installing multiple inverters in a single AC system allows larger loads than a single inverter can handle. This requires stacking. Stacking inverters does not refer to physically placing one on top of another. It refers to how they are wired within the system and then programmed to coordinate activity. Stacking allows all units to work together as a single system.

Examples of stacking configurations include “parallel” and “three-phase” configurations.

Stacking Connections

Stacking requires an OutBack HUB product, as well as a system display such as the OutBack MATE. A system using four or fewer units may use the HUB4. Systems using up to ten units require the HUB10. All interconnections are made using CAT5 non-crossover cable.

HUB4

MATE

Additional Ports

Port 1 MATE Port

Figure 19 OutBack HUB4 and MATE

Each inverter must be assigned a status — “master” or “slave”. The master is the primary and most heavily used unit. The master inverter’s MATE/HUB port must connect to port 1 on the HUB.

Slave inverters provide assistance when the loads are more than the master can handle alone. Slaves plug into ports 2 and above on the HUB. In general, it does not matter which slave connects to which port. However, it is always important to keep track of units and ports for programming purposes.

Programming involves using the system display to assign a status and stacking value to the inverter on each port. Each inverter is assigned to power an individual phase of the system. These assignments can be changed at any time as long as the master is plugged into port 1.

IMPORTANT:

The master inverter must always be connected to port 1 on the HUB. Connecting it elsewhere, or connecting a slave to port 1, will result in backfeed or output voltage errors which will shut the system down immediately.

Installing multiple inverters without stacking them (or stacking them improperly) will result in similar errors and shutdown.

Although stacking allows greater capacity, the loads, wiring, and breakers must still be sized appropriately. Overloading may cause breakers to trip or the inverters to shut down.

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Outback Power Systems GFX1448E, GFX1424E, GFX1312E Multiple-Inverter Installations Stacking, Stacking Connections
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GFX1448E, GFX1424E, GFX1312E specifications

Outback Power Systems has long been recognized for its innovation and reliability in the field of renewable energy solutions, particularly with its GFX series of grid-tied inverters. The GFX1312E, GFX1424E, and GFX1448E models exemplify their commitment to quality and performance, making them ideal choices for both residential and commercial applications.

The GFX1312E is designed to deliver a solid 1300 watts of continuous output power at 12 volts, offering efficient energy conversion for smaller solar setups or off-grid living situations. Its compact design allows for easy installation, while advanced engineering ensures high performance even in challenging conditions. The GFX1312E features a pure sine wave output, which is critical for sensitive electronic devices, ensuring compatibility and safeguarding against potential damage.

Moving up in power capacity, the GFX1424E operates at 1400 watts with a 24-volt configuration. This model is particularly well-suited for medium-sized solar energy systems. It supports 120/240 volts split-phase output, providing greater flexibility for various household appliances and ensuring that users can maximize their energy usage with efficiency. The GFX1424E also incorporates an extensive array of intelligent charging profiles that optimize battery performance and longevity.

The GFX1448E caps the series with impressive 1400 watts of continuous output at 48 volts, catering primarily to larger installations and those requiring more robust energy management solutions. This inverter is equipped with Outback's patented GridZero™ technology, allowing for seamless integration of solar energy production with utility power, helping users to minimize grid dependence while maximizing savings. With advanced features like backup capability and grid-interactive operation, this model is highly versatile.

All three models share key characteristics such as network connectivity through the Outback Power's MATE series of controllers, enabling real-time monitoring and system management. They are designed for durability and have protective features against overloads and short circuits, ensuring reliable performance over time. With their modular design, users can easily scale their system by connecting multiple units, making these inverters a practical choice for expanding energy needs.

In summary, the Outback Power Systems GFX1312E, GFX1424E, and GFX1448E inverters provide top-tier options for those looking to harness solar energy efficiently. Their respective power outputs, advanced technologies, and user-friendly interfaces position them as excellent choices for both residential and commercial energy solutions, underscoring Outback's reputation as a leader in the renewable energy market.
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