Solis S6 15kW Three-Phase Hybrid High-Voltage Inverter

The Solis S6-EH3P15K-H (part number SOL-S6-EH3P15K-H) is a 15 kW three-phase high-voltage hybrid inverter from the Solis S6-EH3P(12-20)K-H series. As a hybrid inverter and battery storage controller, it combines PV generation with high-voltage lithium battery management (120–800 V range) and delivers full three-phase backup with UPS-level changeover of less than 10 ms and 200% overload for 10 seconds. It features 4 MPPT trackers with 4 string inputs at up to 20 A per string, a maximum usable PV input of 24 kW (200% DC oversizing), 50 A maximum battery charge/discharge current, dual backup ports for critical and non-critical load separation, generator connectivity, and parallel operation of up to 6 units. IP66 rated with a 7-inch touchscreen, Bluetooth, and app-based commissioning. 3 current sensors included. Available from DECO Group, a UK-based solar trade wholesaler.

Key Technical Details

PV Input

• Recommended maximum PV array size: 30 kW
• Maximum usable PV input power: 24 kW
• Maximum PV input voltage: 1,000 V
• Rated PV voltage: 600 V
• MPPT voltage range: 200 V to 850 V
• DC startup voltage: 160 V
• MPPT quantity: 4
• Maximum string inputs: 4 (1 per MPPT)
• Maximum PV input current: 4 x 20 A
• Maximum PV short-circuit current: 4 x 30 A
• PV oversizing: up to 200%
• Integrated DC switch: Yes
• PV connection: MC4

Battery

• Battery type: Li-ion (high voltage)
• Battery voltage range: 120 V to 800 V
• Maximum charge/discharge power: 15 kW
• Maximum charge/discharge current: 50 A
• Battery communication: CAN / RS485
• Battery connection: OT terminal
• Battery charged by PV max efficiency: 98.5%
• Battery charged/discharged to AC max efficiency: 97.2%

AC Output (Grid-Connected)

• Rated AC output power: 15 kW
• Maximum apparent output power: 15 kVA
• Rated grid voltage: 3/N/PE, 220 V / 380 V or 230 V / 400 V
• Rated grid frequency: 50 / 60 Hz
• Rated grid output current: 22.8 A / 21.7 A
• Power factor: greater than 0.99 (0.8 leading to 0.8 lagging)
• THDi: less than 3%
• AC input voltage range: 304–437 V / 320–460 V
• Maximum AC input current: 34.2 A / 32.5 A
• Maximum efficiency: 97.7%
• EU efficiency: 97.5%

Backup / Off-Grid

• Rated backup output power: 15 kW
• Maximum apparent backup output power: 2 x rated power for 10 seconds (200% overload)
• Backup switch time: less than 10 ms (UPS-level)
• THDv at linear load: less than 3%
• Maximum allowable phase imbalance: 100% (grid and backup)
• Maximum power per phase: 40% of rated power (grid and backup)
• Dual backup ports for critical and non-critical load separation
• Supports unbalanced and half-wave loads on both grid and backup ports

Generator

• Generator max input power: 15 kW
• Generator max input current: 22.8 A / 21.7 A
• Generator rated frequency: 50 / 60 Hz

General

• AFCI 2.0: Optional
• Anti-islanding protection: Yes
• Output overcurrent protection: Yes
• Short-circuit protection: Yes
• Parallel operation: up to 6 units
• Display: 7.0-inch LCD with Bluetooth and app
• Communication: CAN, RS485, Ethernet; optional WiFi, Cellular, LAN
• Topology: Transformerless
• Cooling: Intelligent fan-cooling
• Noise emission: less than 65 dB(A)
• Ingress protection: IP66
• Operating temperature: -25°C to +60°C
• Relative humidity: 0% to 95%
• Maximum operating altitude: 2,000 m
• Self-consumption (night): less than 25 W
• Dimensions: 563 x 546 x 250 mm (W x H x D)
• Weight: 35.2 kg
• AC connection: OT terminal

Key Features

• 15 kW three-phase hybrid inverter with high-voltage battery support (120–800 V)
• 4 MPPT trackers with up to 20 A per string for high-power module compatibility
• 200% PV oversizing with up to 24 kW usable PV input
• 50 A maximum battery charge/discharge current
• UPS-level backup switching in less than 10 ms
• 200% overload for 10 seconds in backup mode for motor, pump, and A/C start-up
• Dual backup ports for intelligent control of critical and non-critical loads
• Generator connectivity to extend backup duration during grid outages
• Supports peak shaving control in self-use and generator modes
• 6 customisable charge/discharge time settings
• Parallel operation of up to 6 units
• Intelligent AC coupling for upgrading existing grid-connected systems
• 100% phase imbalance supported on both grid and backup ports
• 97.7% maximum efficiency and 97.5% EU efficiency
• IP66 rated for indoor or outdoor installation
• 7-inch touchscreen with Bluetooth and app for fast commissioning

Included Components

• 1 x Solis S6-EH3P15K-H hybrid inverter
• 3 x Current sensors (for direct connection to the inverter)

System Compatibility

• Part of the Solis S6-EH3P(12-20)K-H series
• Supports high-voltage lithium-ion batteries in the 120–800 V range
• Refer to the Solis Battery Compatibility List for confirmed compatible battery models
• DC and AC coupling supported for new-build and retrofit installations
• Up to 6 units in parallel for expanded capacity
• Extended warranty available: SOL-WAR-10Y-S6-EH3P-12-20K (10-year) or SOL-WAR-20Y-S6-EH3P-12-20K (20-year)

Installation Notes

• At 35.2 kg, a two-person lift is recommended
• IP66 rated for indoor or outdoor installation
• Design PV strings within 1,000 V maximum PV input, operating in the 200–850 V MPPT window
• Verify battery type and configuration; connect within 120–800 V range
• Maximum operating altitude: 2,000 m
• Must be installed by a qualified electrician or technician in compliance with local wiring regulations

Certifications and Compliance

• EN 50549
• VDE 4105
• IEC/EN 62109-1/2 (Safety)
• CE certified

Warranty

• Standard warranty: 5 years
• Extended warranty: extendable to 10 years (SOL-WAR-10Y-S6-EH3P-12-20K) or 20 years (SOL-WAR-20Y-S6-EH3P-12-20K)

Common Questions

Click a question below to reveal the answer.

What is the difference between the Solis S6 15kW HV and LV hybrid inverters?

The HV model (S6-EH3P15K-H) supports high-voltage batteries at 120–800 V with 50 A charge/discharge, has 4 MPPTs, weighs 35.2 kg, and achieves 97.7% max efficiency. The LV model (S6-EH3P15K02-NV-YD-L) supports 48 V batteries at 40–60 V with 290 A charge/discharge, has 2 MPPTs, weighs 42 kg, and achieves 97.5% max efficiency. Both are 15 kW three-phase hybrids with less than 10 ms backup switching and 200% overload capability.

What batteries are compatible with the Solis S6 15kW HV hybrid?

The inverter supports high-voltage lithium-ion batteries in the 120–800 V range with CAN/RS485 communication. Refer to the Solis Battery Compatibility List for confirmed compatible models.

How fast is the backup switching?

Backup changeover is specified as less than 10 ms, providing UPS-level switching for critical loads.

What is the dual backup port feature?

The inverter has two backup ports allowing intelligent separation of critical and non-critical loads. During grid outages, critical loads can be prioritised to extend backup duration.

Can I connect a generator?

Yes. The inverter supports generator connectivity with a maximum generator input of 15 kW to extend backup duration during extended outages.

About Solis

Ginlong Solis, established in 2005, is an internationally recognised manufacturer of solar inverters for residential, commercial, and utility-scale applications. The S6-EH3P(12-20)K-H series is Solis's advanced three-phase high-voltage hybrid platform for residential and small commercial energy storage.

DECO Group supplies Solis hybrid inverters in both HV and LV variants alongside compatible battery systems, monitoring accessories, and system components. Browse our Solis hybrid inverter catalogue for complete three-phase storage configurations.

About DECO Group

We supply Solis hybrid inverters, battery systems, and installation accessories to professional installers and electrical contractors across the UK. Our Solis range covers both HV and LV three-phase hybrid inverters from 8 kW to 20 kW. Visit decogroup.co.uk for the full catalogue.