Photovoltaic On-Grid Connected Inverter SG20KTL

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1. Structure of Solar Photovoltaic On-Grid Connected Inverter SG20KTL 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 On-Grid Connected Inverter SG20KTL

• Full 20 kW effective power at power factor of 0.9 due to apparent power reserves up to 22.2 kVA

• Photon test results "very good", with a maximum efficiency of 98% (Photon Profi 2-2012)

• Dual MPP trackers control

• Active power continuously adjustable (0~100%)

•Reactive power control with power factor 0.8 overexcited ~ 0.8 underexcited

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

• Product certification: TÜV, CE, CEI 0-21, G59/2, AS4777, BDEW, VDE AR-N-4105, CGC, compliance with Italian medium voltage grid requirement

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


3. Photovoltaic On-Grid Connected Inverter SG20KTL Images






4. Photovoltaic On-Grid Connected Inverter SG20KTL 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


Output Side Data

Nominal AC output power


Max AC output power(PF=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



< 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


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

Smart forced air cooling

Max. operating altitude

4000m (>3000m derating) 


Graphic LCD


RS485(RJ45 connector)

DC connection type


AC connection type

Plug and play connector


EN62109-1, EN62109-2, EN61000-6-2,EN61000-6-3, VDE0126-1-1,

CEI 0-21, AS/NZS3100, AS4777.2, AS4777.3,


Mechanical Data



Mounting method

Wall bracket





5. FAQ of Photovoltaic On-Grid Connected Inverter SG20KTL

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 is the difference between a PV inverter and a solar inverter?
The main function of photovoltaic grid-connected inverter is to convert the DC power of the solar PV module into the same frequency as the sinusoidal AC power of the grid (the grid is generally AC power grid, DC can not be directly connected)
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 a grid-connected inverter and an off-grid inverter? What are the advantages of a hybrid inverter?
Grid-connected inverter does not need energy storage, but the energy can not be controlled, how much light to send online to the number of online, simply do not want people to the grid does not like.
Q:PV grid-connected inverter can directly load it?
TL5001 operating voltage range of 3.6 ~ 40V, its internal with an error amplifier, a regulator, oscillator, a dead zone control PWM generator, low voltage protection circuit and short circuit protection circuit
Q:PV grid-connected inverter and independent inverter in the control of what is the difference
And you said that the independent inverter, said off-grid inverter it, this inverter can not access the mains, the components of the electricity through the off-grid inverter to the battery charge, the battery at night
Q:Installation and maintenance of photovoltaic grid - connected inverter
photovoltaic systems Power generation system used in the cable must be connected firmly, good insulation and specifications appropriate.
Q:What is the PV inverter starting voltage
Photovoltaic inverter, also known as power regulator, according to the inverter in the use of photovoltaic power generation system can be divided into two kinds of independent power supply and grid. According to the waveform modulation method can be divided into square wave inverter, stepped wave inverter, sine wave inverter and modular three-phase inverter. For the inverter for the grid system, depending on whether the transformer can be divided into transformer-type inverter and transformer-free inverter.
Q:After the PV inverter, how to achieve the same period before the network?
It can automatically detect the generator and the grid frequency and voltage, in the frequency, voltage, phase are in line with the requirements of the grid to set the time before the release of the closing signal, so that it can be safely and securely connected.
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?
Q:Generally a large grid-connected photovoltaic power plant will have several inverters
Inverter, a single failure, does not affect other operations, the impact on the grid is small, high reliability.

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