Photovoltaic Grid-Connected Inverters SG250K3

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1.  Structure of Photovoltaic Grid-Connected Inverters SG250K3 Description

SG630KTL is using low-frequency isolation transformer for protective purpose. Its wider input voltage range ensures more combinations of

the PV arrays. Moreover, optical fiber isolation technology has been adopted to increase its anti-interference ability under the circumstances

of multiple inverters installation. In addition, optimized circuit and structural design has improved system thermal efficiency which enhancing

system reliability and stability. Reinforced protection functions, including the DC ground fault protection, make it the best product for large

scale PV power plant.



2.  Main Features of the Photovoltaic Grid-Connected Inverters SG250K3


* Advanced Technology, Grid-friendly

LVRT, HVRT and zero-voltage ride through to cope with various grid conditions

SVG function at night, response to grid directives around the clock

Reactive power control with power factor from 0.9 lagging to 0.9 leading

* More Compact, Saving Space for PV Plant

Power density enhanced 50%, one of the central inverters with highest power density in the PV industry

Save installation spaces and lower the plant initial cost

Front maintenance, able to install against the wall, convenient installation and maintenance, saving operation cost of the PV plant.

* Efficient, More Yields

Max. efficiency at 97.3% with transformer

Efficient MPPT control strategy, improve power yields

28335 chips adopted, more accurate calculation, more power yields;

  Intelligent speed regulation cooling concept, low consumption, high efficiency

* More Advantages

Perfect protection and fault alarm system, safe and reliable

User-friendly dynamic graphics LCD

Redundant dual power supply solution improving the system reliability

Efficient PWM algorithm, low consumption of switch

Operate without power derating at -25 - +55

Reliable and continues operation in high altitude environment

Auxiliary heater (opt.)

CGC certification, compliance with BDEW



3.  Photovoltaic Grid-Connected Inverters SG250K3 Images




SG250K3 PV inverter


4.  Photovoltaic Grid-Connected Inverters SG250K3 Specification




Max. DC Voltage 


Start Voltage


MPP Voltage Range


Min. DC Voltage


Max. DC Power 


Max. Input Current 



Rated Output Power


Max. AC Output Current


Rated Grid Voltage


Grid Voltage Range 


Rated Grid Frequency


Grid Frequency Range


Output Current THD

<3% (at nominal power)

DC Current Injection

<0.5% of rated inverter output current

Power Factor



Max. Efficiency 

97.3%(with transformer)

Euro Efficiency 

96.7%(with transformer)

Protection Degree


Power Consumption at Night


Operating Temperature


Cooling Method

Temperature controlled forced-air cooling

Relative Humidity

0~95%, non-condensing

Max. Working Altitude

6000m (operation with derating above 3000m)



touch screen LCD

Standard Comm. Interfaces


Optional Comm. Interfaces





Net Weight





5.  FAQ of Photovoltaic Grid-Connected Inverters SG250K3

Q1. What is the difference between inverter and solar inverter?

A1. Inverter only has AC inpput, but solar inverter both connect to AC input and solar panel, it saves more power.



Q2. What is the difference between MPPT&PWM?

A2. MPPT has higher efficiency, it can track the max power point and won't waste energy.


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Q:Photovoltaic grid-connected inverter without DC emc how will happen
When solar or other light illuminates the PN junction of the semiconductor, a voltage (called a photogenerated voltage) occurs on both sides of the PN junction. This phenomenon is the famous photovoltaic effect.
Q:Installation and maintenance of photovoltaic grid - connected inverter
Before making an electrical connection, be sure to use the opaque material to cover or disconnect the PV panel. Exposure to sunlight, photovoltaic arrays will produce dangerous voltages. All installation operations must be done only by qualified technicians.
Q:Grid-connected inverter is generally divided into photovoltaic power generation grid-connected inverter, wind power grid-connected inverter, power equipment and grid-connected inverter and other power generation equipment power generation inverter.
The small use of field-effect transistors while using a DSP conversion controller to improve the quality of the output power makes it very close to the sine wave current.
Q:Solar grid inverter does not merge into the grid, direct access to the load to the load power supply?
The solar grid-connected inverter is not connected to the grid and can not be directly connected to the load to supply power to the load because there is no voltage.
Q:PV grid-connected inverter and independent inverter in the control of what is the difference
PV grid-connected inverter in the grid before the inverter needs to determine the phase voltage phase frequency, the first phase-locked, in the grid and power generation.
Q:Is the grid side of the grid and the inverter?
Grid-type system power transmission sequence: photovoltaic panels> relays> inverters> relays> electricity load + power grid (both in parallel).
Q:What is the difference between low voltage grid connection and medium voltage grid connection?
The difference is that the current at low voltage and the grid is large, the current is small when the voltage is small, followed by the low voltage crossing parameter setting problem (such as PV inverter integrated with inverter and low voltage crossing function, not all photovoltaic inverter
Q:Generally a large grid-connected photovoltaic power plant will have several inverters
, This method is simple to design, easy maintenance, but also for the power grid harmonics smaller, good power quality!
Q:Photovoltaic grid-connected inverter problem
Hello, the definition of the zero line is not caused by the transformer three-phase electric tail connection? I now do not understand why there is no isolation transformer AC output marked is N (zero line), and it is not the transformer three-phase power of the tail connection leads to, this is the zero line? The The
Q:What is the difference between a grid-connected inverter and an off-grid inverter? What are the advantages of a hybrid inverter?
Hybrid inverter is not a clear concept, but now both energy storage dual-grid inverter does have the ability to receive control system,

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