Photovoltaic Grid-Connected Inverter SG50KTL-M

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1. Structure of Photovoltaic Grid-Connected Inverter SG50KTL-M Description

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

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

It is acritical 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.

Suitable for 50Hz/60Hz grid, could be used in Asia, Africa and Europe. Available for hand installation, no need for lifting machinery



2. Main Features of the Photovoltaic Grid-Connected Inverter SG50KTL-M

• High flexibility for complex configurations due to 4 MPP trackers and a wide input voltage range

• High yields due to efficiency up to 98.9% and EU efficiency of 98.5%

• Output power up to 55kVA / 55kW(SG50KTL-M) and 66kVA / 66kW(SG60KTL-M) at power factor of 1


• Integrated combiner box: 12 x MC4 connector pairs with DC string fuses, Type II overvoltage protection and DC switch, more safety and lower the system cost


• Active power continuously adjustable (0~100%)

• Fulfill a variety of reactive power adjustment requirments with power factor 0.8overexited ~0.8 underexited

• Integrated LVRT and HVRT function

• Includes RS-485 interface, compatible with all common monitoring systems


• Product certification: TÜV, CE, G59/3, BDEW, CGC and GB-T19964

Manufacturer certification: ISO 9001, ISO 14001, OHSAS 18000


3. Photovoltaic Grid-Connected Inverter SG40KTL Images






4. Photovoltaic Grid-Connected Inverter SG50KTL-M Specification

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


Output Side Data

Nominal AC output power


Max AC output powerPF=1


Max. AC output apparent power


Max. AC output current


Nominal AC voltage

3/N/PE, 230/400Vac

AC voltage range


Nominal grid frequency


Grid frequency range

45~55Hz /55~ 65Hz


< 3 %  (Nominal power)

DC current injection

<0.5 %In

Power factor

>0.99@default value at nominal power

(adj. 0.8overexcited ~0.8underexited)


Anti-islanding protection




DC reverse connection protection


AC short circuit protection


Leakage current protection


DC switch


DC fuse


Overvoltage protection

DC Type II DIN rail surge arrester(40kA)

System Data

Max. efficiency


Max. European efficiency


Isolation method


Ingress protection rating


Night power consumption


Operating ambient temperature range

-25~60(>50 derating)

Allowable relative humidity range


Cooling method

Smart forced air cooling

Max. operating altitude

4000m (3000m derating) 


Graphic LCD



DC connection type


AC connection type

Screw Clamp terminal



BDEW,GB/T 19964, GB/T 29319 

Mechanical Data


665 * 906 * 256 mm

Mounting method

Wall bracket





5. FAQ of Photovoltaic Grid-Connected Inverter SG50KTL-M

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
Sine wave output inverter control integrated circuits, sine wave output of the inverter, the control circuit can be used microprocessor control, such as INTEL company produced 80C196MC, Motorola produced MP16 and MI-CROCHIP company PIC16C73 and so on, these single-chip microcomputer has a multi-channel PWM generator,
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 grid inverter is a current source, the output voltage is basically the grid voltage, may be slightly raised.
Q:What is the difference between a PV inverter and a solar inverter?
Instability, the wind speed and the equipment itself will directly affect the generator rotation, so the voltage and current fluctuations, frequency instability, in short, is the power quality is poor) Therefore, through the inverter after the first rectification inverter to improve the quality of power
Q:The working principle of photovoltaic grid - connected inverter
Inverter will be converted into alternating current DC, if the DC voltage is low, then through the AC transformer boost, that is, the standard AC voltage and frequency. For large-capacity inverter, because the DC bus voltage is high, AC output generally does not require transformer boost that can reach 220V, in the small and medium capacity of the inverter, because the DC voltage is low, such as 12V, 24V, It is necessary to design a boost circuit.
Q:How the output voltage of the PV inverter and the grid-connected voltage are determined
due to the higher penetration rate of the car to go out to work or travel can be connected with the inverter battery drive electrical and various tools work. The car inverter output through the cigarette lighter is 20W, 40W, 80W, 120W to 150W power specifications. And then a large number of power inverter power
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: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:After the PV inverter, how to achieve the same period before the network?
When the voltage, frequency, phase does not meet the requirements, the automatic closing closing pulse.
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:In a photovoltaic grid-connected project, the role of the inverter is to convert the voltage into AC 220V or 380V for the grid, since the transformer will raise the voltage again
Self-use, do you mean off-grid system? Or else? Europe and Sweden side of the grid project electricity situation is also self-use? If not for their own use or spontaneous use is not used up, sent to other places electricity, you need a transformer?

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