Advanced Three-Phase Solar, Battery and Backup Solution

The Solis S6-EH3P15K-H-AU is part of the S6-EH3P(12-20)K-H-AU high-voltage energy storage inverter range available for the Australian market. The series is designed to integrate solar generation, high-voltage lithium battery storage, grid operation, backup power and generator support in one three-phase system.

The 15kW model supports a recommended PV array size of up to 30kW, giving system designers substantial solar oversizing flexibility. It includes four MPPT trackers, each supporting up to 20A input current and 30A short-circuit current.

Key Features

☀️ Up to 30kW Recommended Solar PV Capacity

The Solis S6-EH3P15K-H-AU supports a recommended maximum PV array size of 30kW, effectively allowing substantial PV oversizing relative to the inverter's 15kW rated AC output.

The inverter supports:

• 4 MPPTs
• 4 maximum PV input strings
• 20A maximum input current per MPPT
• 30A maximum short-circuit current per MPPT
• 200–850V MPPT operating range
• 1000V maximum PV input voltage

This makes the inverter suitable for more complex roof layouts and different panel orientations, while supporting modern higher-power PV modules. Solis specifically highlights the four-MPPT architecture for sites with multiple orientations or shading conditions.

High-Voltage Battery Integration

The S6-EH3P15K-H-AU supports compatible lithium-ion battery systems operating across a wide 120–800V battery voltage range.

Battery specifications include:

Battery type: Lithium-ion
Battery voltage range: 120–800V
Battery ports: 1
BMS ports: 1
Maximum charge/discharge current: 50A
Battery communication: CAN / RS485

This gives system designers flexibility when pairing the inverter with compatible high-voltage battery configurations.

⚡ 15kW Three-Phase Output

The inverter provides:

Rated grid output power: 15kW
Rated apparent output power: 15kVA
Rated grid voltage: 3/N/PE, 230V / 400V
Rated grid output current: 21.7A
Power factor: >0.99, adjustable from 0.8 leading to 0.8 lagging
THDi: <3%

Powerful Backup Capability

For backup applications, the S6-EH3P15K-H-AU provides:

• 15kW rated backup output
• 15kVA rated backup apparent power
• Up to 1.6 × rated apparent power for 10 seconds
• <10ms backup switching time
• 21.7A rated backup output current

For the 15kW model, 1.6 times rated apparent output corresponds to up to 24kVA for 10 seconds under the stated overload condition. This is a calculation based on the official 15kVA rated backup apparent power and the datasheet's 1.6× overload specification.

This higher short-duration backup capability can help accommodate suitable loads with higher startup demand, such as motors, pumps and air-conditioning equipment, subject to system design and load characteristics. Solis specifically highlights overload capability for these types of startup loads.

Generator Integration

One of the major strengths of the S6-EH3P(12-20)K-H-AU range is generator compatibility.

For the 15kW model, the generator input specifications include:

Maximum generator input power: 15kW
Rated input current: 21.7A
Rated voltage: 3/N/PE, 230V / 400V
Rated frequency: 50Hz

Solis states that the series supports multiple generator connection methods and automatic control, providing additional flexibility for locations with unstable grid supply or backup generation requirements.

Smart Energy and System Flexibility

The Solis S6-EH3P15K-H-AU supports several advanced system design and energy management capabilities.

DC and AC Coupling

The inverter supports both DC coupling and AC coupling, allowing additional flexibility when:

• adding battery storage to existing solar systems;
• expanding PV capacity;
• charging batteries from different system architectures;
• supporting loads in off-grid scenarios.

Up to Six Inverters in Parallel

The series supports up to six units operating in parallel, allowing system capacity to be expanded for higher-power installations.

SG-Ready Heat Pump Support

Solis states that the inverter supports SG-Ready heat pump connectivity, allowing greater coordination between solar generation, battery storage and compatible heat-pump operation.

AI-Powered and VPP-Ready

The product range is promoted by Solis as AI-powered and VPP-ready, supporting intelligent energy optimisation and participation in compatible energy management or Virtual Power Plant arrangements where available and properly configured.

Customisable Battery Backup Level

The inverter allows battery backup levels to be configured, helping system owners reserve battery capacity for backup operation according to system requirements.

Efficiency

The Solis S6-EH3P(12-20)K-H-AU range specifies the following efficiency figures:

These figures apply to the series, including the 15kW model.

Technical Specifications

All specifications above are taken from the official Solis Australia 2026 datasheet for the S6-EH3P(12-20)K-H-AU series.

Protection Features

The official datasheet lists protection features including:

• DC Type III surge protection;
• AC Type III surge protection;
• output over-current protection;
• insulation resistance monitoring;
• residual current detection;
• integrated PV switch;
• DC reverse-polarity protection;
• active anti-islanding using frequency shift.

Why Choose the Solis S6-EH3P15K-H-AU?

Large Solar Capacity

Supports up to 30kW recommended PV array capacity, making it suitable for larger solar and energy storage systems.

Four Independent MPPTs

Four MPPT trackers provide flexibility for roofs with different orientations, shading patterns or complex array layouts.

Strong Backup Capability

Provides 15kW continuous backup output and supports up to 1.6 times rated apparent power for 10 seconds.

High-Voltage Battery Flexibility

Supports compatible lithium battery systems across a broad 120–800V range with up to 50A charge and discharge current.

Generator Support

Supports generator connection and automatic control for more resilient power-system configurations.

Advanced Energy Management

Supports DC and AC coupling, SG-Ready heat pumps, customisable backup battery reserve, VPP-ready operation and parallel expansion of up to six units.

Recommended Website Product Card

Solis S6-EH3P15K-H-AU

15kW Three-Phase High-Voltage Hybrid Inverter

☀️ Up to 30kW Recommended Solar PV Array
4 Independent MPPTs
⚡ 20A PV Input Current per MPPT
120–800V High-Voltage Battery Range
50A Maximum Battery Charge/Discharge Current
15kW Rated Backup Output
Up to 24kVA Backup Capability for 10 Seconds
⏱️ <10ms Backup Switching
⚙️ Generator Integration & Automatic Control
DC and AC Coupling Support
Up to 6 Units in Parallel
IP66 Protection
7-inch LCD, Bluetooth & App Control
SG-Ready Heat Pump Support
AI-Powered & VPP-Ready

Contact UR Needs for pricing, compatible battery options and complete three-phase solar and battery system packages.

Call us at 0449 916 688