Operation

Multiple-Inverter Installations (Stacking)

Multiple inverters in a single system can support larger loads than a single inverter can handle. Installing inverters in this configuration is called “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 one system.

Each inverter is programmed to power an individual phase of the system and to operate at certain times. This order is assigned using a system display, such as the OutBack MATE or MATE3. (Stacking the GFX inverters requires a MATE with firmware revision 4.1.6 or above.)

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

Stacking requires an OutBack HUB product, as well as a system display. A system of four or fewer units may use the HUB4. Systems of up to ten units require the HUB10. All interconnections are made using CAT5 non-crossover cable. (See the International Series GFX Installation Manual for more stacking instructions.)

Each inverter needs to be assigned a status — “master” or “slave”. The master is the primary and most heavily used unit. Slave inverters provide assistance when the loads are more than the master can handle alone. Programming involves using the system display to assign a status and stacking value to the inverter on each port. See the system display and HUB manuals for programming instructions.

HUB4

Port 1

MATE

Additional Ports

MATE Port

Figure 7 OutBack HUB4 and MATE

IMPORTANT:

¾The 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.

¾Installing multiple inverters without stacking them (or stacking them incorrectly) will result in similar errors and shutdown.

¾Although stacking allows greater capacity, the loads, wiring, and overcurrent devices must still be sized appropriately. Additional terminations and bus bars may be required. Overloading may cause circuit breakers to open or the inverters to shut down.

CAUTION: Equipment Damage

The inverters in a stacked system should all be the same DC voltage, wattage, and model. Do not stack inverters of different wattages.

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Outback Power Systems GFX1424E, GFX1312E, GFX1448E manual Multiple-Inverter Installations Stacking, OutBack HUB4 and Mate
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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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