Solis S5-GR3P20K 20kW Three-Phase 2-MPPT Grid-Tied Inverter
The Solis S5-GR3P20K (part number SOL-S5-GR3P-20K-DC) is a 20 kW three-phase, 2-MPPT grid-tied string inverter from the Solis S5 GR3P series. Designed for residential, small commercial, and light industrial PV systems, it features 2 MPPT trackers with 4 string inputs at 32 A per MPPT, a recommended maximum PV input of 30 kW (150% DC/AC ratio), and a maximum efficiency of 98.7% (98.1% EU efficiency). With a maximum output of 22 kW, optional AFCI arc-fault protection, IP66 ingress protection, THDi below 2%, adaptive weak grid support, and optional 24-hour load consumption monitoring, the S5-GR3P20K delivers a compact, high-efficiency solution for professional three-phase installations. G98/G99 certified. Available from DECO Group, a UK-based solar trade wholesaler.
Key Technical Details
- Part number: SOL-S5-GR3P-20K-DC
- Supplier part number: S5-GR3P20K
- Inverter type: Three-phase grid-tied string inverter
- Rated AC output power: 20 kW
- Maximum output power: 22 kW
- Maximum apparent output power: 22 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: 30.4 A / 28.9 A
- Maximum output current: 31.8 A
- Power factor: greater than 0.99 (0.8 leading to 0.8 lagging)
- THDi: less than 2%
- Maximum efficiency: 98.7%
- EU efficiency: 98.1%
- Transformer: None (transformerless)
- Recommended maximum PV power: 30 kW
- 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: 32 A / 32 A per MPPT
- Maximum short-circuit current: 40 A / 40 A per MPPT
- MPPT quantity: 2
- Maximum string inputs: 4 (2 per MPPT)
- Integrated DC switch: Yes
- AFCI: Optional (supported depending on configuration)
- Surge protection: Yes
- Communication: RS485; optional WiFi, GPRS
- Display: LCD
- DC connection: MC4
- AC connection: Quick connection plug
- Cooling: Intelligent fan-cooling
- Noise emission: less than 60 dB(A)
- Ingress protection: IP66
- Operating temperature: -25°C to +60°C
- Relative humidity: 0% to 100%
- Maximum operating altitude: 4,000 m
- Self-consumption (night): less than 1 W
- Dimensions: 310 x 563 x 219 mm (W x H x D)
- Weight: 20.8 kg
Key Features
- 20 kW rated output with 22 kW maximum and 30 kW recommended PV input for greater than 150% DC/AC oversizing
- 2 MPPT trackers with 4 string inputs for flexible split-array design
- 98.7% maximum efficiency and 98.1% EU efficiency
- THDi below 2% for clean power export and stable grid interaction
- Optional AFCI protection for proactive DC arc-fault fire risk reduction
- Adaptive weak grid support for challenging grid conditions
- IP66 rated for dependable outdoor installation
- 24-hour load consumption monitoring when paired with a compatible smart meter
- Export power control support for grid-limited applications
- Integrated DC switch
- SolisCloud ready for remote monitoring
- Compact and lightweight at 20.8 kg and 310 x 563 x 219 mm
- Night self-consumption of less than 1 W
Included Components
- 1 x Solis S5-GR3P20K inverter
- 1 x Back plate
- 2 x Fastening screws
- DC connectors
- 1 x AC quick connection plug
- 1 x RJ45 connector
- 1 x User manual
System Compatibility
- Part of the Solis S5-GR3P(3-20)K series
- MC4 DC connectors; AC quick connection plug
- This inverter does not include a data logger, CT, meter, or export power manager
- For export power control of a single inverter: use the SOL-METER-3PH-CT3 (requires a data logging stick such as the S5-WiFi-ST)
- For export power control of multiple inverters: use the EPM3-5G-PRO (or EPM3-5G-PLUS)
- Extended warranty available: SOL-WAR-10Y-S5-GR3PK (5 additional years) or SOL-WAR-20Y-S5-GR3PK (15 additional years)
Protection Features
- AFCI (optional, depending on configuration)
- DC reverse polarity protection
- DC short-circuit protection
- Output overcurrent protection
- Over-temperature protection
- Integrated DC switch
- Surge protection
- Anti-islanding protection
- IP66 ingress protection
Certifications and Compliance
- G98 / G99
- G100
- EN 50549
- NRS 097-2-1
- CE certified
Installation Notes
- At 20.8 kg, single-person installation is feasible
- IP66 rated for indoor or outdoor installation
- Install vertically or with a slight backward tilt up to 15 degrees
- Allow at least 500 mm clearance around sides and bottom, 1,000 mm above
- Avoid direct sunlight where possible
- Inverter surface can exceed 75°C during operation
- For startup: AC ON first, then DC ON. For shutdown: Grid Off, then AC OFF, then DC OFF
- Must be installed by a qualified electrician or technician
Warranty
- Standard warranty: 5 years
- Extended warranty: extendable to 10 years (SOL-WAR-10Y-S5-GR3PK) or 20 years (SOL-WAR-20Y-S5-GR3PK)
Common Questions
Click a question below to reveal the answer.
What is the difference between the Solis S5-GR3P and S5-GC series?
The GR3P series (3–20 kW) is designed for residential and small commercial three-phase systems with a compact, lightweight form factor and quick-connect AC plug. The GC series (25–60 kW) targets larger commercial and industrial installations with more MPPT trackers, higher current ratings, and OT terminal AC connections.
Does the Solis S5-GR3P20K include monitoring equipment?
No. Data logger, CT, meter, and export power manager are sold separately. For single-inverter export control, use the SOL-METER-3PH-CT3 with a data logging stick. For multi-inverter systems, use the EPM3-5G-PRO or EPM3-5G-PLUS.
Is the Solis S5-GR3P20K suitable for residential installations?
Yes. The S5-GR3P series is specifically designed for residential, small commercial, and light industrial three-phase PV systems. At 20.8 kg and 310 x 563 x 219 mm, it's compact enough for domestic installations.
Can I extend the warranty?
Yes. The standard 5-year warranty can be extended to 10 years or 20 years with the appropriate warranty extension parts.
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 specialists from eight countries, Solis inverters deliver high efficiency, wide input voltage ranges, and precise MPPT performance.
DECO Group supplies Solis grid-tied inverters across the S5-GR3P, S5-GC, and S6 series alongside compatible monitoring accessories, export power meters, and extended warranty packages. Browse our inverter catalogue for the complete Solis range.
About DECO Group
We supply Solis inverters and system accessories to professional solar installers and electrical contractors across the UK. Our Solis range covers residential through to commercial-scale three-phase grid-tied inverters. Visit decogroup.co.uk for the full catalogue.
