Solis S6-GC125K 125kW Three-Phase 10-MPPT Commercial Grid-Tied Inverter
The Solis S6-GC125K (part number SOL-S6-GC125K) is a 125 kW three-phase, 10-MPPT commercial and industrial grid-tied string inverter. Part of the S6-GC(80-125)K series, it features 10 MPPT trackers with 20 string inputs, support for greater than 150% DC/AC ratio, and a maximum efficiency of 98.7% (98.3% EU efficiency). Designed for commercial rooftop, industrial, utility-scale, and agricultural PV systems using high-power modules, the S6-GC125K includes AI-based AFCI protection, real-time PV grounding detection, intelligent I-V curve scanning, IP66 ingress protection, and dual independent RS485 ports. Supports master-slave export power control with up to 10 units in parallel. G99 certified. Available from DECO Group, a UK-based solar trade wholesaler.
Key Technical Details
- Part number: SOL-S6-GC125K
- Manufacturer model: S6-GC125K
- Inverter type: Three-phase C&I grid-tied string inverter
- Rated AC output power: 125 kW
- Maximum output power: 125 kW
- Maximum apparent output power: 125 kVA
- Rated grid voltage: 3/N/PE, 220 V / 380 V, 230 V / 400 V
- Rated grid frequency: 50 / 60 Hz
- Rated grid output current: 189.9 A / 180.4 A
- Maximum output current: 189.9 A
- Power factor: greater than 0.99 (0.8 leading to 0.8 lagging)
- THDi: less than 3%
- Maximum efficiency: 98.7%
- EU efficiency: 98.3%
- Transformer: None (transformerless)
- Maximum DC input voltage: 1,100 V
- Rated DC voltage: 600 V
- MPPT voltage range: 160 V to 1,000 V
- DC startup voltage: 180 V
- Maximum input current: 5 x (42 A / 36 A)
- Maximum short-circuit current: 10 x 50 A
- MPPT quantity: 10
- Maximum string inputs: 20 (2 per MPPT)
- Maximum input current per string: 21 A
- DC/AC ratio: greater than 150%
- Integrated DC switch: Yes
- Integrated AC switch: Optional
- Integrated EPM function: Optional (up to 10 devices)
- AFCI 2.0: Optional (AI-based)
- PID recovery: Optional
- Surge protection: Type II (DC and AC)
- Strings monitoring: Yes
- I-V curve scanning: Yes
- Night SVG function: Yes
- Communication: RS485 (dual independent); optional WiFi, GPRS, PLC
- Display: LCD
- DC connection: MC4
- AC connection: OT terminal (max 240 mm²)
- Cooling: Intelligent fan-cooling
- Ingress protection: IP66
- Operating ambient temperature: -30°C to +60°C
- Relative humidity: 0% to 100%
- Maximum operating altitude: 4,000 m
- Self-consumption (night): less than 2 W
- Dimensions: 1,014 x 567 x 345 mm (W x H x D)
- Weight: 96 kg
Key Features
- 125 kW three-phase output with support for greater than 150% DC/AC oversizing
- 10 MPPT trackers with 20 string inputs for maximum design flexibility across large arrays
- Up to 21 A per string, compatible with high-power 182 mm and 210 mm PV modules
- 98.7% maximum efficiency and 98.3% EU efficiency
- AI-based millisecond arc protection (AFCI 2.0, optional)
- Real-time PV grounding detection and protection
- Intelligent I-V curve scanning and strings monitoring for smart diagnostics
- IP66 ingress protection for outdoor installation in demanding environments
- Dual independent RS485 ports for third-party integration
- Master-slave export power control with up to 10 units in parallel
- Supports single and multiple genset applications without an external genset controller
- SolisCloud ready for remote monitoring, diagnostics, and firmware upgrades
- Night SVG function
- Optional integrated EPM, PID recovery, and AC switch
- Maximum operating altitude of 4,000 m
System Compatibility
- Part of the Solis S6-GC(80-125)K three-phase C&I inverter series
- MC4 DC connectors; OT terminal AC connection (max 240 mm²)
- Optional export power meter: METER-3PH-CT3
- Optional WiFi/LAN logger: S2-WL-ST-USB
- Optional PLC communication
- EPM still required for the S6-GC(80-125)K range (UK installations)
- Extended warranty available: SOL-WAR-10Y-S6-GC80-125K (10-year extension)
Protection Features
- AI-based AFCI 2.0 (optional)
- Real-time PV grounding detection and protection
- Strings monitoring
- DC reverse polarity protection
- DC short-circuit protection
- Output overcurrent protection
- Surge protection: Type II (DC and AC)
- Anti-islanding protection
- Temperature protection
- Arc fault and RSD co-operation (optional)
- IP66 ingress protection
Certifications and Compliance
- G99
- IEC 61727
- EN 50549-1/2
- VDE 4110
- IEC/EN 62109-1/2 (Safety)
- IEC/EN 61000-6-2/4 (EMC)
- NRS 097-2-1
- CE certified
Included Components
- 1 x Solis S6-GC125K inverter
- 1 x Mounting bracket
- 2 x Fastening screws
- 20 x DC connectors
- 1 x User manual
Installation Notes
- At 96 kg, a minimum of two people are required for safe handling and mounting
- IP66 rated for indoor or outdoor installation
- Install vertically or with a slight backward tilt up to 15 degrees; do not install leaning forward or upside down
- Maintain at least 500 mm clearance between inverters and surrounding equipment, and 1,000 mm above for ventilation and access
- Avoid direct sunlight where possible to reduce thermal derating
- Do not install in flammable or explosive atmospheres or near highly flammable materials
- Inverter surface can exceed 75°C during operation
- For startup: switch AC grid supply ON first, then DC isolator ON. For shutdown: Grid Off, then AC OFF, then DC OFF
- Must be installed by a qualified electrician or competent commercial solar installer
Warranty
- Standard warranty: 5 years
- Extended warranty: available up to 20 years (SOL-WAR-10Y-S6-GC80-125K for 10-year extension)
Common Questions
Click a question below to reveal the answer.
How many MPPT inputs does the Solis S6-GC125K have?
The S6-GC125K has 10 MPPT trackers with 20 string inputs (2 strings per MPPT), supporting up to 21 A per string for compatibility with high-power modules.
What is the difference between the Solis S6 125kW and 150kW?
The 125 kW (S6-GC125K) has 10 MPPTs with 20 strings, while the 150 kW (S6-GC3P150K07) has 7 MPPTs with 21 strings. The 150 kW model has higher per-MPPT current (54 A vs 42 A) and higher maximum efficiency (98.8% vs 98.7%). Both share IP66 protection, dual RS485, and support for 10-unit parallel operation.
Does the Solis S6-GC125K include monitoring equipment?
No. Monitoring, export power control, and communications accessories are sold separately. Use the METER-3PH-CT3 for export power management and the S2-WL-ST-USB for WiFi/LAN connectivity. The inverter is SolisCloud ready. An EPM is still required for UK installations.
Can multiple Solis S6-GC125K inverters be installed in parallel?
Yes. The S6-GC125K supports master-slave export power control with up to 10 units in parallel.
What are the dimensions and weight of the Solis S6-GC125K?
The S6-GC125K measures 1,014 x 567 x 345 mm (W x H x D) and weighs 96 kg. A minimum of two people are required for handling.
About Solis
Ginlong Solis, established in 2005, is an internationally recognised manufacturer of solar inverters for residential, commercial, and utility-scale applications. Designed by a global R&D team of professors and specialists from eight countries, Solis inverters are engineered for high efficiency, wide input voltage ranges, and precise MPPT performance.
DECO Group supplies Solis commercial and industrial grid-tied inverters alongside compatible monitoring accessories, export power meters, extended warranty packages, and communication modules. Browse our commercial inverter catalogue for the full Solis C&I range.
About DECO Group
We are a UK-based solar wholesaler supplying commercial-scale inverters, monitoring hardware, and system accessories to professional installers and electrical contractors. Our Solis C&I range covers the S6-GC(80-125)K series and the S6-GC150K for large three-phase PV projects. Contact our commercial team or visit decogroup.co.uk for project-specific support.
