Deye String Inverter Three Phase 20kW, 25kW

The Deye 20kW 25kW three phase string inverter is a high-performance solar inverter solution designed for commercial and large-scale photovoltaic applications. Built for efficient DC to AC power conversion, this inverter series provides reliable energy management with advanced monitoring and protection functions.

The SUN-18/20/25K-G04 series supports high PV input capacity with a maximum PV input voltage of 1000V and multiple MPPT trackers, allowing flexible solar system design for different installation requirements. With a maximum efficiency of up to 98.6%, the inverter helps maximise solar energy utilisation while reducing conversion losses.

Designed for professional solar installations, this three phase PV inverter supports applications including zero export and VSG functions. Optional features such as string intelligent monitoring and Anti-PID functionality provide additional flexibility for system optimisation.

With an IP65-rated enclosure, natural cooling design and a wide operating temperature range, the inverter is engineered for dependable outdoor operation. Multiple communication options including RS485, RS232, WiFi and LAN allow convenient system monitoring and integration.

Available in 20kW and 25kW models, the Deye three phase solar inverter provides a reliable solution for commercial solar projects requiring efficient performance, flexible configuration and long-term operational stability.

Key Features of DEYE String Inverter Three Phase 20kW, 25kW

High PV Input Capability for Large Solar Systems

The SUN-18/20/25K-G04 series is designed to support high-capacity PV systems with:

• Maximum PV input power up to 37.5kW
• Maximum PV input voltage of 1000V
• Wide MPPT operating range
• Multiple PV string inputs

This allows installers to design efficient solar arrays while maintaining flexibility in system configuration.

Multiple MPPT Trackers for Flexible PV Design

The inverter is equipped with:

• 2 MPPT trackers
• Multiple string inputs per MPPT

The independent MPPT design helps optimise energy harvesting from solar panels operating under different conditions, such as different orientations or installation layouts.

High Conversion Efficiency

The inverter delivers efficient solar energy conversion with:

• Maximum efficiency up to 98.6%
• Euro efficiency up to 98.1%
• MPPT efficiency above 99%

High conversion efficiency helps reduce energy losses and improve overall PV system performance.

Three Phase Grid Connection

The inverter supports three-phase grid connection for commercial solar applications.

Key output specifications include:

• Rated output power:
  • 20kW model
  • 25kW model
• Three phase operation
• Grid voltage:
  • 380V / 400V
• Frequency:
  • 50Hz / 60Hz optional

This makes the inverter suitable for larger solar installations requiring stable three-phase power conversion.

Zero Export & VSG Application Support

The inverter supports advanced applications including:

• Zero export application
• VSG application

These functions provide additional flexibility for solar energy management based on project requirements.

Optional Smart Monitoring Functions

The SUN-18/20/25K-G04 series supports optional string intelligent monitoring.

This feature allows better visibility into PV system performance and helps installers identify potential operational issues.

Optional Anti-PID Function

The inverter supports an optional Anti-PID function, providing additional support for PV systems requiring PID mitigation solutions.

Reliable Outdoor Performance

The inverter is designed for outdoor installation with:

• IP65 protection rating
• Natural cooling system
• Operating temperature range:
  • -25°C to +65°C
• Maximum operating altitude:
  • 4000m without derating

The robust enclosure design helps maintain reliable operation in different environmental conditions.

Integrated Safety Protection

The inverter includes multiple protection functions:

• DC reverse polarity protection
• AC short circuit protection
• AC output overcurrent protection
• Output overvoltage protection
• Insulation resistance protection
• Ground fault monitoring
• Anti-islanding protection
• Temperature protection
• Active frequency shift

It also includes surge protection:

• DC Type II
• AC Type II

These integrated protections improve system safety and operational reliability.

Main Benefits

For Solar Installers & EPC Contractors

The Deye 20kW 25kW three phase string inverter provides installers with a reliable solution for commercial PV projects requiring high power output and flexible installation.

The dual MPPT design simplifies system planning by supporting different PV array configurations, while the IP65 enclosure allows outdoor installation without requiring additional protection equipment.

Multiple communication options also make system setup, monitoring and maintenance more convenient.

For Solar System Designers

Engineers benefit from the inverter’s high efficiency, wide input voltage range and flexible configuration options.

The ability to support high PV input capacity allows designers to optimise solar array sizing while maintaining efficient energy conversion.

Optional functions such as string monitoring and Anti-PID provide additional design flexibility for advanced PV systems.

For Commercial Solar Users

For businesses investing in solar energy, reliable inverter performance is essential for maintaining consistent energy production.

The inverter’s high efficiency of up to 98.6%, three-phase output and integrated protection functions support stable long-term operation.

Its communication capabilities also allow better visibility into system performance and energy management.

For Electrical Distributors

The SUN-18/20/25K-G04 series provides distributors with a professional-grade commercial solar inverter solution.

Its combination of high efficiency, advanced functions and broad application suitability makes it suitable for a wide range of commercial PV projects.

Installation

The installation of the DEYE three phase PV inverter should be performed by qualified solar installers following the manufacturer’s installation requirements and applicable electrical standards.

1. Select Installation Location

Before installation, select a suitable location that provides:

• Stable mounting surface
• Adequate ventilation
• Protection from unsuitable environmental conditions

The inverter is designed for outdoor installation with:

• IP65 protection
• Operating temperature from -25°C to +65°C
• Maximum altitude of 4000m

Ensure sufficient clearance around the inverter for operation and maintenance access.

2. Mount the Inverter

Secure the inverter onto a suitable wall or mounting structure.

The inverter specifications:

• Size: 362W × 577H × 215D mm
• Weight: 23.5kg

Ensure the mounting structure can safely support the inverter weight.

3. Connect PV Strings

Connect the solar panel strings to the inverter DC input terminals.

Before connection:

• Confirm PV voltage is within the inverter operating range.
• Check correct DC polarity.
• Ensure all connectors are properly secured.

The inverter supports multiple PV strings through its MPPT inputs.

4. Connect AC Output

Connect the inverter to the three-phase grid connection.

Verify:

• Correct phase connection
• Proper grounding
• Appropriate protection devices

The inverter supports:

• Three-phase grid connection
• 380V / 400V output voltage

5. Connect Communication System

The inverter provides multiple communication options:

• RS485
• RS232
• WiFi
• LAN

Connect the required communication interface according to the monitoring system setup.

6. System Commissioning

Before activating the inverter:

1. Check all electrical connections.
2. Confirm PV and AC parameters.
3. Verify safety protection settings.
4. Turn on the inverter system.
5. Confirm normal operation through the display interface.

Once commissioning is completed, the inverter can begin converting solar energy into usable AC power.

Deye

Deye is a renewable energy technology company specialising in photovoltaic inverter solutions and energy storage products.

The company develops solar power solutions designed for residential, commercial and industrial applications, focusing on efficient energy conversion, intelligent monitoring and reliable system operation.

Through its range of solar inverters, Deye provides solutions that support modern renewable energy systems with advanced technology and flexible application options.