The Deye SUN-SG04LP3-EU series are hybrid three-phase inverters designed for installations in Poland, where operational flexibility with the grid and genuine backup power are essential. These devices can function as a classic on-grid system without batteries, but with expansion, they support low-voltage energy storage systems (48 V), compatible with the BMS of popular batteries. The built-in EPS (Emergency Power Supply) enables rapid switching to power selected circuits, proving highly effective in homes and small businesses.
A standout feature is the inclusion of 2 independent MPPTs - offering better yield optimization under shading, different roof slopes, and when panels are split north-south. The high European efficiency means fewer losses under typical operating conditions, resulting in more stable energy production throughout the season.
Monitoring is convenient via WiFi and LAN communication, along with integration into an app. The entire system includes mandatory safety features and certifications (such as EN 50549), as well as warranty options available depending on the distributor.
Ranking
Price offers
| Shop | Country | Price | Per kW | Stock | Offer updated | Link to shop |
|---|---|---|---|---|---|---|
| Alians Shop | Poland | 6 700.16 zł net | 837.52 zł/kW | In stock | 23h ago | Visit shop |
| Consor Energia | Poland | 10 265 zł incl. VAT | 1 283.12 zł/kW | In stock | 23h ago | Visit shop |
Specifications
Pros and cons
The declared European efficiency, at 97.2% (maximum 97.9%), according to the manufacturer's datasheet, places the series among the leading three-phase hybrid LV systems. The MPPT tracking efficiency is 99.9%, which minimizes losses under variable solar irradiance typical of the Polish climate.
The time to switch to backup power mode (EPS) is less than 10 ms, which meets the requirements for protecting sensitive electronic equipment (computers, NAS, UPS). Competitive entry-level hybrid systems (e.g., Solax X3-Hybrid G4) claim 20 ms for comparable LV configurations.
The series supports up to 10 inverters in parallel, both in on-grid and off-grid configurations, enabling the construction of approximately 120 kW three-phase systems using a single piece of equipment. This is a rarity in the segment of low-voltage hybrid systems and offers real flexibility for small commercial and industrial (C&I) applications.
The inverter meets the required standards for the Polish market (EN 50549-1/-2) and has an IP65 degree of protection, which allows for installation both outdoors and in unheated spaces. The operating temperature range is from -25°C to +60°C, which is important for the cold Polish winters.
The maximum charging and discharging current of the 240A battery at 48V corresponds to a peak power of approximately 11.5 kW, which allows for a very dynamic response to sudden increases in demand without being limited by the storage system in a typical residential or small commercial and industrial (C&I) installation.
When working with power levels of 10-12 kW, currents on the battery side can reach 200-240A, which requires cables with a cross-section of 70-95 mm² between the inverter and the battery storage system. High-voltage systems (e.g., SMA Sunny Tripower Smart Energy with HV 200-800V) operate with currents of less than 30A at the same power level, reducing resistive losses and the cost of the battery installation.
The maximum input voltage for the PV system is 600V, while most competitors in the three-phase (Fronius GEN24 Plus, Huawei SUN2000-10KTL-M1, SMA Tripower) category support up to 1000V DC. This limits the string length and may necessitate redesigning during upgrades or with panels exceeding 480 Wp with high Voc.
Alternatives
About the SUN-SG04LP3-EU series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.