Solar Photovoltaic Grid-Connected Inverter SG3KTL-EC

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1.  Structure of Solar Photovoltaic Grid-Connected Inverter SG3KTL-EC Description

A solar inverter, or PV inverter, or Solar converter, converts the variable direct current (DC) output of a photovoltaic (PV) solar panel into a

utility frequency alternating current (AC) that can be fed into a commercial electrical grid or used by a local, off-grid electrical network. It is a

critical BOS–component in a photovoltaic system, allowing the use of ordinary AC-powered equipment. Solar inverters have special

functions adapted for use with photovoltaic arrays, including maximum power point tracking and anti-islanding protection.



2.  Main Features of the Solar Photovoltaic Grid-Connected Inverter SG3KTL-EC

• Flexible design due to dual MPP tracking that is equipped to obtain full nominal power, 3-phase supply

• High energy yield due to maximum efficiency up to 98.1%

• Low noise levels and internal consumption due to natural cooling

• Integrated theft protection

• Access to Home WiFi system and enjoy cloud services via smart phones

• Integrated power management function, easy to receive the adjustable command from grid

• Extensive communication: RS-485, Ethernet, WLAN / WiFi, 4 digital inputs for ripple control receivers

• Product certification: TÜV, VDE 0126-1-1, EN 62109-1/-2, CE, G83/1, VDE-AR-N 4105

• Manufacturer certification: ISO 9001, ISO 14001, OHSAS 18000



3.  Solar Photovoltaic Grid-Connected Inverter SG3KTL-EC Images






4.  Solar Photovoltaic Grid-Connected Inverter SG3KTL-EC Specification

Input Side Data

Max. PV input power


Max. PV input voltage


Startup voltage


Nominal input voltage


MPP voltage range


MPP voltage range for nominal power


No. of MPPTs


Max. number of PV strings per MPPT


Max. PV input current


Max. current for input connector


Short-circuit current of PV input


Output Side Data

Nominal AC output power


Max AC output powerPF=1)


Max. AC output apparent power


Max. AC output current


Nominal AC voltage


AC voltage range

310~480Vac(May vary as per corresponding country's grid  standard) 

Nominal grid frequency


Grid frequency range

(May vary as per corresponding country's grid  standard)  


< 3 %  (Nominal power)

DC current injection

<0.5 %In

Power factor

>0.99@default value at nominal power,
(adj. 0.8overexcited ~0.8underexcited)


Anti-islanding protection




DC reverse connection protection


AC short circuit protection


Leakage current protection


DC switch


DC fuse


Overvoltage protection


System Data

Max. efficiency


Max. European efficiency


Isolation method


Ingress protection rating


Night power consumption


Operating ambient temperature range

-25~60(>45 derating)

Allowable relative humidity range


Cooling method

Natural cooling



Max. operating altitude



Graphic LCD


Ethernet,RS485RJ45 connector,
4×Digital Inputs,Wifi

DC connection type


AC connection type

Plug and play connector



Mechanical Data



Mounting method

Wall bracket






5.  FAQ of Solar Photovoltaic Grid-Connected Inverter SG3KTL-EC

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
The square wave output of the inverter using pulse width modulation integrated circuits, such as SG3525, TL494 and so on. Practice has proved that the use of SG3525 integrated circuits, and the use of power FET as a switching power components, to achieve high performance of the inverter, because the SG3525 has a direct drive power FET capability and has an internal reference source and operational amplifiers and Undervoltage protection, so its peripheral circuit is very simple.
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 grid side of the grid and the inverter?
The grid load side of the grid is the grid. The inverter is an important part of the PV grid-connected system and can not be regarded as an external load. Photovoltaic power generation system is included in both grid and off-grid.
Q:How the output voltage of the PV inverter and the grid-connected voltage are determined
Inverter is the DC power (battery, battery) into alternating current (usually 220V, 50Hz sine wave). It consists of inverter bridge, control logic and filter circuit. Widely used in air conditioning, home theater, electric wheel, power tools, sewing machines, DVD, VCD, computer, TV, washing machine, range hood, refrigerator, video recorders, massage, fan, lighting and so on. In foreign countries
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:The function of photovoltaic grid - connected inverter
Finally, a sinusoidal AC output for a grid-connected photovoltaic power generation system is generated by a low-pass filter.
Q:Photovoltaic grid-connected inverter without DC emc how will happen
by means of energy converters can be converted into electrical energy. The process of converting light energy directly into electrical energy is precisely the response to photovoltaic effects. Without the need for any other mechanical parts, the energy in
Q:After the PV inverter, how to achieve the same period before the network?
Grid simulator: analog power grid, normal and abnormal conditions, overvoltage, undervoltage, over frequency, under frequency, sudden power failure, etc.
Q:Photovoltaic grid-connected inverter problem
But Baidu Encyclopedia clearly pointed out: the zero line is the secondary side of the transformer leads the neutral point of the line, and the phase line constitutes a circuit for power supply equipment.
Q:Generally a large grid-connected photovoltaic power plant will have several inverters
The use of a high-power grid-connected inverter into the grid, the need for line design is relatively simple, because the DC and AC lines are separated, the use of convergence box to summarize, DC bus and then into the grid inverter

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