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:What are the methods of photovoltaic grid-connected inverter control
Inverter main circuit need to have a control circuit to achieve, generally have square wave and sine wave two control methods, square wave output inverter power supply circuit is simple, low cost, but low efficiency, harmonic components. Sine wave output is the development trend of the inverter, with the development of microelectronics technology, there are PWM function of the microprocessor has also come out, so the sine wave output inverter technology has matured.
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:Is the PV inverter a current source or a voltage source?
According to the waveform modulation method can be divided into square wave inverter, stepped wave inverter, sine wave inverter and modular three-phase inverter.
Q:Three-phase photovoltaic inverter grid, the use of phase-locked loop is what?
Grid-connected inverter can be operated locally through the LCD screen, or through remote monitoring with dedicated monitoring software.
Q:PV grid-connected inverter and independent inverter in the control of what is the difference
The independent inverter in the output voltage phase amplitude of the frequency control is initially set good. Independent inverter, you should refer to off-grid inverter, do not need to consider the grid situation.
Q:What is the difference between a PV grid-connected inverter and an off-grid inverter?
Offline generally need energy storage, not to send energy online. Power grid has no right to interfere.
Q:The function of photovoltaic grid - connected inverter
After some additional voltage buffering, the left side of the bridge is usually 18 ~ 20khz switching frequency, the dc voltage is converted to ac voltage.
Q:Installation and maintenance of photovoltaic grid - connected inverter
only when the local power sector permission by the professional and technical personnel to complete all the electrical connection before the inverter can be connected.
Q:What is the PV inverter starting voltage
sine wave becomes narrower and the voltage width in the center of the sine wave is widened and the switching element is always operated in a direction at a certain frequency in a half cycle, A pulse wave train (pseudo sine wave). Then let the pulse wave form a sine wave through a simple filter
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!

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