The Stellar 12kW 48V off-grid inverter combines a powerful 12000W inverter, two independent 120A MPPT solar charge controllers and an integrated 150A mains battery charger in one versatile unit. Designed for demanding off-grid installations, this inverter can accept input from two separate solar arrays, a mains power supply or generator, and a 48V battery bank.

With a substantial 12000W rated output and a total maximum solar array capacity of 12000W (2 × 6000W), this model is particularly well suited to larger off-grid power systems requiring high levels of solar generation and battery charging capacity. Its dual independent MPPT inputs provide additional flexibility when configuring solar arrays, while the integrated mains charger offers an alternative means of charging the battery bank when solar energy is insufficient.

This is the perfect solution for any off-grid application with limited or zero access to traditional mains power. This hybrid inverter features an Uninterrupted Power Supply (UPS), making it the ideal option for applications where the power supply is unreliable, intermittent, or expensive to maintain. This inverter is great for both stationary and mobile off-grid installations (e.g., remote properties, holiday homes, huts and cabins or narrowboats, yachts etc), as well as for customers looking to reduce their mains electricity usage and save on electricity bills. It could also create the perfect back-up system in locations suffering from frequent power cuts.

Key functions:

1. 12000W 48V inverter: Converts DC power from a 48V battery bank into AC electricity to operate household appliances, electrical equipment and other connected loads. With a powerful 12000W rated output, this inverter is designed for larger off-grid installations with substantial electrical demands.

2. Dual 120A MPPT solar charge controllers: Features two independent 120A MPPT solar charge controllers, with a combined maximum solar charging power of 150A, and a maximum solar input voltage of 450V. Each controller can accept a solar array of up to 6000W, giving a combined maximum solar array capacity of 12000W (2 × 6000W). The two independent inputs allow separate solar arrays to be connected, offering greater flexibility when using different panel configurations or orientations. This makes the inverter particularly well-suited to larger solar installations or arrays operating under different light conditions. Solar performance data can be viewed via the LCD screen and monitoring software.

3. Integrated 150A mains battery charger: The built-in 150A battery charger enables the connected battery bank to be charged from a mains power supply or compatible generator. This provides an alternative charging source when solar generation is insufficient, helping to maintain battery capacity and system availability.

4. System expansion potential: This inverter has the ability to be connected in parallel with additional identical units (maximum of 5 further inverters), offering the possibility of large-scale system expansion, with up to 72KW of power handling capability. Furthermore, there is the option to connect 3 units for 3-phase operation (ideal if the system is being used to power industrial grade equipment and machinery run on 3 phase).

5. Dual AC outputs: Features two separate AC outputs, providing additional flexibility when distributing power to connected appliances and electrical circuits. This allows different loads to be connected to the inverter's separate output terminals, according to the system configuration.

Additional intelligent features:

The Stellar 12kW inverter includes a range of advanced functions and configurable settings to help optimise system performance and accommodate different installation requirements.

• Power-saving mode: Reduces the inverter's power consumption when operating with little or no connected load, helping to minimise unnecessary battery drain.

• Advanced lithium battery communication: Supports both CAN and RS485 communication protocols for compatible lithium battery systems, allowing the inverter to communicate with the battery's BMS (Battery Management System). This helps coordinate charging and discharging parameters according to the battery manufacturer's requirements.

• Customisable operating settings: A range of adjustable parameters allows the inverter to be configured to suit the installation, including battery charging settings, operating priorities and other system functions.

• Intelligent solar charging: The two independent MPPT controllers continually optimise solar energy harvesting from their respective PV arrays, helping to maximise available solar power for battery charging.

• Mains and generator compatibility: The AC charging input allows the battery bank to be charged from a suitable mains supply or generator, providing additional flexibility for off-grid applications.

Battery compatibility:

This hybrid inverter is suitable for 48V flooded, sealed GEL/AGM lead-acid and Lithium batteries with pre-defined charging programs (consult the battery supplier for advice on Lithium battery charging settings). A user-defined battery type with numerous customisable settings is also available for charging other battery types.

With its 12000W inverter output, dual independent 150A MPPT solar charge controllers, 150A mains battery charger and advanced lithium battery communication, the Stellar inverter provides a powerful and flexible solution for larger off-grid solar installations.

Click on the Details and Specifications tab for further technical information.

Inverter specifications:

• Nominal battery voltage: 48V
• Continuous power output: 12000W (220-240V AC)
• AC Output frequency: 50/60Hz
• Output waveform: Pure sine wave
• Maximum mains AC charging current: 150A
• Peak efficiency: 92%
• Maximum combined solar output current: 150A
• Maximum PV open circuit: 500V
• Maximum PV power per tracker: 6000W + 6000W
• MPPT voltage range: 90 - 450V
• Operating temperature: -15°C to 50°C
• Humidity: 95% without condensation
• Size: 425 x 527 x 145 mm
• Weight: 18.1 kg

This product is covered by a 5 year manufacturer warranty. For more information please refer to our Terms and Conditions.

This product comes with a detailed user manual which explains wiring and operations (see Documents tab).

If you need help with installation or have any technical questions we can provide FREE support - please contact us by email or phone (see Contact Us page for more information).

The following documents are available to download:

User manual for Stellar 12kW 48V off-grid Inverter Charger (ST-PV12000-48)