Sunsynk 25kW Three-Phase Hybrid Solar Inverter

Sunsynk 25kW Three-Phase Hybrid Inverter — Overview

The Sunsynk 25kW Three-Phase is designed for South African commercial and large residential installations where load profiles exceed the capacity of single-phase inverters or where three-phase supply balancing is required by the municipality or the NRS 097 SSEG standard. At 25kW of continuous three-phase output with up to 50kW of solar input across two MPPT channels, it delivers sufficient capacity for most small to medium commercial premises in South Africa.

Technical Specifications

• Rated AC output power: 25kW (three phase, 400V, balanced)
• AC output voltage: 400V L-L (3-phase, 4-wire, 50Hz)
• Maximum AC output current: 36.1A per phase
• Maximum solar input power: 50kW (two MPPT channels)
• MPPT voltage range: 150V–1,000V DC
• Maximum MPPT input current per channel: 25A
• Battery voltage range: 80V–560V DC (HV battery)
• Maximum battery charge/discharge power: 25kW
• Maximum battery charge/discharge current: 50A (at 500V HV battery)
• Battery type: High voltage LiFePO4 (compatible BMS via CANBUS)
• Transfer time (grid to battery): Less than 20ms
• Efficiency (peak): 97.6%
• Communication: Wi-Fi (built-in), RS485, CANBUS, Ethernet
• Protection rating: IP65 (outdoor suitable)
• Operating temperature: -25°C to +60°C
• Display: LCD display panel
• Certifications: IEC 62109, IEC 61000, NRS 097
• Warranty: 5 years

Three-Phase Operation for South African Commercial and Industrial Sites

Many South African commercial and agricultural consumers are supplied on three-phase 400V from Eskom or their municipality. Installing single-phase inverters on a three-phase supply creates phase imbalance which is prohibited above certain power levels in most municipal supply agreements. The Sunsynk 25kW Three-Phase balances generation and backup equally across all three phases, maintaining compliance with NRS 097 and SANS 10142-1 requirements for three-phase solar installations, and avoiding the additional import/export fees that some supply authorities levy on unbalanced three-phase generation systems.

SSEG and NRS 097 Compliance

The Sunsynk 25kW Three-Phase is compliant with NRS 097-2-1 for grid-connected SSEG installations in South Africa. It includes built-in anti-islanding protection, reactive power control, voltage and frequency ride-through capability, and zero-export limiting via an RS485 smart meter interface. These features are required by Eskom and most South African municipalities for approval of SSEG applications above the standard household 3.68kVA threshold. Your solar installer and electrical engineer will be responsible for the complete SSEG application package including single-line diagram, load schedules, and municipal application forms.

Solar Input and String Sizing

The 25kW Three-Phase has two independent MPPT channels, each accepting strings up to 1,000V DC open-circuit voltage and 25A maximum current. A typical commercial configuration might use 20 x 585W N-Type bifacial panels per MPPT channel (11.7kW per channel, 23.4kW total), wired as two parallel strings of 10 panels per MPPT (Voc approximately 498V per string). String sizing should be performed by a qualified solar engineer accounting for minimum ambient temperature Voc, maximum temperature Vmp, and cable voltage drop.

High Voltage Battery Integration

The Sunsynk 25kW Three-Phase connects to high-voltage lithium battery systems in the 80V–560V DC range. Compatible South African HV battery systems include the Freedom Won Lite Business HV range, Dyness HV series, and other CANBUS-compatible LiFePO4 HV stacks. The battery interface communicates via CANBUS BMS protocol to manage state of charge, charge voltage, and protection thresholds. Low-voltage 48V batteries are not compatible with this inverter — confirm battery compatibility with your solar installer before procurement.

Monitoring and Remote Control

The built-in Wi-Fi module connects to the Sunsynk cloud platform and the free Sunsynk app, providing real-time and historical monitoring of solar generation, battery state of charge, grid import/export, and load consumption per phase. Remote firmware updates, charge mode programming, and generator integration settings are configurable via the app or the onboard LCD display. The RS485 port enables integration with third-party SCADA and building management systems for commercial applications.

Frequently Asked Questions

Is the Sunsynk 25kW Three-Phase approved for SSEG export in South Africa?
Yes. The Sunsynk 25kW Three-Phase is NRS 097-2-1 compliant and includes the required anti-islanding, reactive power control, and zero-export functions for SSEG application to Eskom or a South African municipality. Final SSEG approval depends on the complete application package, site inspection, and the approval process of your specific supply authority.

What battery system is compatible with the Sunsynk 25kW Three-Phase?
The Sunsynk 25kW Three-Phase requires a high-voltage (HV) battery system operating in the 80V–560V DC range. It is not compatible with 48V low-voltage batteries. Compatible South African HV battery systems include Freedom Won Lite Business HV and Dyness HV Series. Confirm BMS CANBUS compatibility with your installer and battery supplier before purchase.

How many solar panels can connect to the Sunsynk 25kW Three-Phase?
Up to 50kW of solar panels can be connected across two MPPT channels, each accepting strings up to 1,000V Voc and 25A maximum current. For 585W panels with 49.8V Voc, strings of up to 20 panels in series (Voc ≈ 996V) are compatible, subject to minimum temperature Voc calculations for your installation location.

Does this inverter work with a diesel generator?
Yes. The Sunsynk 25kW Three-Phase includes a generator input port and can manage generator start/stop based on battery state of charge. This is a common configuration for South African commercial sites where load shedding duration exceeds battery capacity, with the generator providing supplementary charging and load support.