Sineng’s outdoor EP-3125-HA-UD is designed for higher reliability,higher durability and lower cost

Sineng Electric Co., Ltd. is a leading solar inverter manufacturer in the world. According to the GTM Research 2017 Report, Sineng Electric is the world's fifth largest solar inverter manufacturer. In 2014, following integration with a Fortune 500 company's PV business, the company became a leader in terms of R&D, management and marketing in the global PV market. Currently, Sineng Electric has completed the establishment of its local sales and service system for the Indian market. The Indian company's annual solar inverter production capacity is expected to reach 3GW. Sineng Electric is capable of meeting the diversified needs of its customers with the widest portfolios of solar inverters ranging from single and three-phase string inverters up to megawatt-sized central inverters and central distributed inverters. This extensive range of solar inverters is suitable for the smallest residential photovoltaic systems right up to multi-megawatt PV plants.

Features and Benefits of EP-3125-HA-UD

a. Product Introduction

In the context of increasingly large photovoltaic power station monomer, the traditional 1000V system is losing its advantage in reducing system cost. Compared with 1000V system, 1500V system’s advantages are as follows: Enhance the dielectric strength level of components, inverters, cables, combiner boxes and other equipments; 1500V system has high dielectric strength level,thus more modules can be series-connected in one string, then it can save the investment of cable, combiner boxes, transformers and other equipments; Reduce ac-dc side loss and transformer low-voltage side loss.

Consider the above advantages, Sineng developed the EP-3125-HA-UD series inverter. It is a compact all-in-one outdoor device which eliminates the need of traditional inverter containers. Compared with the same power inverter, the EP-3125-HA-UD has smallest size, highest power density and highest cost performance.

b. Technology Specifications

Electrical Data


Max. input voltage


Max. input current


MPPT voltage range


No. of MPPTs


Rated output power


Max. output AC power


Rated grid voltage


Optional Grid voltage range


Rated output current


Max. output current


Rated grid frequency


Adjustable displacement factor

0.8(lagging) ~ 0.8(leading)

Max. / European efficiency

99.00% / 98.70%

Standby consumption


Dimensions(W × H × D)




Operating temperature range


Cooling concept

Temperature controlled air-cooling

Degree of protection


Max. permissible value for relative humidity

0~95%, non -condensing

Max. altitude

4500m (derating> 3000m)

Communication port/protocols

Standard: RS485, Ethernet


c. Technology Advancements

•Low system cost

Adopts advanced three-level technology, the highest DC bus voltage 1500V, the maximum conversion efficiency of 99%. Maximum DC/AC ratio can be up to 1.5. Highest power density in all centralized inverters above 3MW. With single capacity of 3.125 MW, the EP-3125-HA-UD is flexible in 6.25MW or 12.5 MW block design. The 6.25MW block solution uses two inverters to access three winding transformer. The 12.5 MW block solution uses four inverters to access five winding transformer. It will greatly reduce the cost of transformers and high-voltage RMUs that is suitable for utility plant such as large flat surface and water surface photovoltaic power stations over 25MW.

•Convenient for O&M

Outdoor design without container. It is designed for easy and fast installation. With all the key components such as IGBT models are in front space and modular design that is convenient for O&M.

•High reliability & durability

As shown in figure, the cold air enters through the filter follow the heat dissipation channel. The cold air is guided from top to bottom by the cooling fans to reduce the heat produced by the inverter. The key components are sealed and contact the external duct through the radiator. This isolation design improves the adaptability of the inverter to different environments, protects the key components, and ensures the long-term stable operation of the system.


d. Benefitted Customer Segment

As a leader in the industry, Sineng is committed to maximizing customer benefits. The EP-3125-HA-UD is most suitable for large scale projects, so that they can maximize their solar generation. With the advanced air-cooled design, it can work without derating at 50 °C, which is very suitable for the hot climate in India. High protection performance for outdoor use, IP54 protection level of inverter and IP65 protection level of key components are suitable for all kinds of harsh environments.



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