Deye SUN-20K-SG05LP3-EU-SM2

Three-Phase Hybrid Inverter SUN-20K-SG05LP3-EU-SM2 by Deye

High‑efficiency, transformer-isolated three‑phase hybrid inverter designed to retrofit existing solar installations with battery storage, diesel generator compatibility, and scalable paralleling for on‑grid and off‑grid operation.

Applications and use cases

This device is engineered for flexible energy management in homes, commercial rooftops, and small to medium-sized facilities that require seamless PV integration, storage, and backup capability. Its AC‑coupled retrofit approach lets you upgrade or expand an existing solar system without replacing the original PV array, while enabling parallel battery banks for increased storage capacity. The system supports both grid‑tied and standalone operation, making it suitable for upgrades to legacy installations and new hybrid setups alike.

• AC‑coupled retrofit of existing solar systems for expanded storage and backup
• Three‑phase design to handle unbalanced loads with reliable performance
• On‑grid and off‑grid operation with scalable energy storage via parallel battery banks
• Multiple units can be paralleled (up to 10 units) for higher total storage and output
• Diesel generator energy intake and storage for hybrid backup scenarios
• Transformer isolation design for enhanced safety and system resilience
• Rugged enclosure suitable for demanding environments (IP65 protection in its design)

Key electrical and performance parameters

The SUN‑20K‑SG05LP3‑EU‑SM2 combines a 20 kW rated inverter with the capability to deliver higher peak performance, supporting flexible operation across PV, battery, and generator sources. It is designed to tolerate unbalanced phase loading, providing 100% per‑phase output with up to 50% of the rated power available per phase when needed. This enables efficient energy distribution in real-world three‑phase installations and supports two MPPT channels to maximize harvest from diverse PV arrays.

• Three‑phase inverter architecture with per‑phase loading flexibility (100% unbalanced output, up to 50% of rated power per phase)
• Rated inverter power: 20 kW; maximum AC power up to 22 kW
• DC input capability up to 30 kW; transformer‑isolated DC link
• MPPT: 2 independent trackers; 3 strings per MPPT
• Nominal DC voltage around 550 V; maximum DC voltage up to 800 V; ramping compatibility with high‑voltage DC links
• Min DC voltage to start feed‑in: 160 V; Maximum DC current: 56 A
• MPPT voltage range: 160–650 V
• Maximum efficiency: 97.6%; Euro efficiency: 97%
• AC frequency: 50/60 Hz; Power factor: 1
• Number of phases: 3
• Dimensions: 750 mm (H) x 456 mm (W) x 268.5 mm (D); Weight: 50.6 kg
• Operating temperature: −40 to +60 °C; Humidity tolerance: 0–100%
• Protection: IP65 enclosure; Intelligent air cooling for reliability
• Maximum operating altitude: 3000 m

Battery and backup capabilities

The SUN‑20K‑SG05LP3‑EU‑SM2 is built to manage and store energy across multiple battery banks and sources, providing robust backup options. It is designed to work with a 48V low‑voltage battery stack and supports paralleling multiple batteries and parallel units to scale storage. A high charging/discharging current of up to 350 A enables quick energy exchange, while six fixed charging/discharging periods per day support sophisticated energy scheduling. In addition, it can store energy generated by a diesel generator, enabling reliable hybrid operation even when PV generation is limited.

• Supports storing energy from diesel generators for hybrid operation
• Parallel battery banks and up to 10 units in parallel for scalable storage
• Maximum charging/discharging current: 350 A for rapid energy management
• Six distinct charging/discharging time periods to tailor energy scheduling
• Low‑voltage 48V battery integration with transformer isolation design for safety
• Designed for on‑grid and off‑grid backups with flexible energy routing between PV, storage, and grid/generator sources