The Sun2000 KTL L1 inverters are a range of solar inverters produced by Huawei Technologies Co. Ltd, one of the manufacturers dominating the global inverter market. They are transformerless models with a maximum operating efficiency of 98.2%, reaching 98.4% depending on the model, and are intended for residential use.

As one of Australia’s most reliable and high-quality inverters, the Huawei Sun2000 KTL L1 is an excellent an addition to your home solar system.

Inverters are critical components of any solar PV system, allowing solar panel owners to power their appliances using solar energy.

But a solar inverter is the system component that most prone to failure. Therefore, choosing an affordable inverter that can sustain itself without the need for constant servicing is vital.

This article provides an in-depth analysis of the Huawei Sun2000 2KTL L1 inverter. We’ll examine the technical details of this inverter, what makes it unique, and key features you should know before you decide to purchase.

Before we get started, you can learn more about Huawei products here.

What is the Huawei Sun2000 KTL L1 Inverter?

The Sun2000 is a single-phase grid-tied inverter with a PV string that helps convert solar energy from DC power to AC power. The electricity generated will then feed into the power grid for household appliance use.

This Huawei inverter has a separate model exclusive to Australia. The model names provide information about the specific product, such as its size (power level), product family name, topology, and design code. 

Consider this model identifier:

  • One = This is the product family name. In this case, Sun2000 is a grid-tied solar inverter.
  • Two = This is the power level. The number with “K” indicates the power level of the product. For example, if the product you buy is Sun2000 5KTL L1, it will have an output voltage of 5 kW. 
  • Three = This represents the topology of the inverter. The letter “TL” shows that it is a transformerless inverter. 
  • Four = This refers to the product’s design code. Here, “L1” is “residential”. It means that the Sun2000 KTL L1 Inverter is designed for residential purposes. 

The Sun2000 KTL L1 inverter, designed for residential use, applies to household rooftop grid-tied systems. This system is composed of PV strings, grid-tied solar inverters, AC switches, and power distribution units. Such distribution units are used to control electrical power in a data centre.

Even though Huawei Technologies Co. Ltd is a relative newcomer in the solar industry, it has quickly risen to one of the leading positions in the market by manufacturing some of the best solar inverter products. 

Huawei consistently led the global solar inverters market as the largest inverter supplier from 2015 to 2019. Wood Mackenzie presented estimates of the global market share in 2019, which showed Huawei at the head of the pack once again.  

Huawei’s manufacturers are known for using state-of-the-art technology for building the inverter systems. And despite Huawei’s main facility being located in the distinctly Chinese city of Shenzhen, the manufacturing process of the company’s inverter systems is more global than you might think.

Developers design the chipsets used in this system in Silicon Valley, California. The architecture and configuration of the inverters are derived from the company’s German brand, located in Nuremberg, Germany. The inverter technology of this system is then brought from Huawei’s company branch in Sweden.

Huawei Sun2000 KTL L1 Inverter Range

The Huawei Sun2000 KTL L1 inverter has specific efficiency and power output levels based on the model. It can range from 2,000 watts to 6,000 watts with a voltage range of 90 volts to 560 volts. 

The product model range includes:

  • Huawei Sun2000 2KTL L1
  • Huawei Sun2000 3KTL L1
  • Huawei Sun2000 3.68KTL L1
  • Huawei Sun2000 4KTL L1
  • Huawei Sun2000 4.6KTL L1
  • Huawei Sun2000 5KTL L1
  • Huawei Sun2000 6KTL L1

Take note that inverter costs can add up to 10% to 20% of your expense on your entire solar power system. Thus, investing in the highest quality inverter you can will significantly influence the efficiency and performance of your solar power project.

Fortunately, the Australian government sees the benefits of installing solar panels for commercial and residential purposes. In fact, they have a law and specific regulations for both large-scale and small-scale regulations. 

The government provides incentives to encourage more solar installations in the country. However, the incentives may vary by state and have specific requirements to meet their eligibility. 

With its heavy regulated and scrutinised solar industry, it’s no wonder that South Australia achieved a global milestone. The jurisdiction is the first globally that’s powered solely by solar energy. 

Read more about the government solar incentives here.  

Huawei Sun2000 KTL L1 Inverter Technical Specifications 

Here are the technical specifications of the Sun2000 KTL L1 from the data sheet of Huawei inverters:    

Technical SpecificationSun2000-2KTL-L1Sun2000-3KTL-L1Sun2000-3.68KTL-L1Sun2000-4KTL-L1Sun20004.6KTL-L1Sun2000-5KTL-L1Sun2000-6KTL-L1
Input (PV)
Recommended max. PV power3,000 Wp4,500 Wp5,520 Wp6,000 Wp6,900 Wp7,500 Wp9,000 Wp
Max. input voltage600 V600 V600 V600 V600 V600 V600 V
Start-up voltage100 V100 V100 V100 V100 V100 V100 V
MPPT operating voltage range90 V – 560 V90 V – 560 V90 V – 560 V90 V – 560 V90 V – 560 V90 V – 560 V90 V – 560 V
Rated input voltage360 V360 V360 V360 V360 V360 V360 V
Max. input current per MPPT12.5 A12.5 A12.5 A12.5 A12.5 A12.5 A12.5 A
Max. short-circuit current18 A18 A18 A18 A18 A18 A18 A
Number of MPP trackers2222222
Max. input number per MPP tracker1111111
(DC Battery)
Compatible batteryLG Chem RESU 7H_R / 10H_RLG Chem RESU 7H_R / 10H_RLG Chem RESU 7H_R / 10H_RLG Chem RESU 7H_R / 10H_RLG Chem RESU 7H_R / 10H_RLG Chem RESU 7H_R / 10H_RLG Chem RESU 7H_R / 10H_R
Operating voltage range350 ~ 450 Vdc350 ~ 450 Vdc350 ~ 450 Vdc350 ~ 450 Vdc350 ~ 450 Vdc350 ~ 450 Vdc350 ~ 450 Vdc
Max operating current10 A @7H_R / 15 A @10H_R10 A @7H_R / 15 A @10H_R10 A @7H_R / 15 A @10H_R10 A @7H_R / 15 A @10H_R10 A @7H_R / 15 A @10H_R10 A @7H_R / 15 A @10H_R10 A @7H_R / 15 A @10H_R
Max charge power3,500 W @7H_R / 5,000 W @10H_R3,500 W @7H_R / 5,000 W @10H_R3,500 W @7H_R / 5,000 W @10H_R3,500 W @7H_R / 5,000 W @10H_R3,500 W @7H_R / 5,000 W @10H_R3,500 W @7H_R / 5,000 W @10H_R3,500 W @7H_R / 5,000 W @10H_R
Max discharge Power @7H_R2,200 W3,300 W3,500 W3,500 W3,500 W3,500 W3,500W 
Max discharge Power @10H_R2,200 W3,300 W3,680 W4,400 W4,600 W5,000 W5,000 W
Compatible BatteryHUAWEI Smart LUNA2000 ESS Battery 5kWh – 30kWhHUAWEI Smart LUNA2000 ESS Battery 5kWh – 30kWhHUAWEI Smart LUNA2000 ESS Battery 5kWh – 30kWhHUAWEI Smart LUNA2000 ESS Battery 5kWh – 30kWhHUAWEI Smart LUNA2000 ESS Battery 5kWh – 30kWhHUAWEI Smart LUNA2000 ESS Battery 5kWh – 30kWhHUAWEI Smart LUNA2000 ESS Battery 5kWh – 30kWh
Operating voltage range350 ~ 560 Vdc350 ~ 560 Vdc350 ~ 560 Vdc350 ~ 560 Vdc350 ~ 560 Vdc350 ~ 560 Vdc350 ~ 560 Vdc
Max operating current15 A15 A15 A15 A15 A15 A15 A
Max charge Power5,000 W5,000 W5,000 W5,000 W5,000 W5,000 W5,000 W
Max discharge Power2,200 W  3,300 W3680 W4,400 W4,600 W5,000 W5,000 W
Protection & FeaturesAll Sun2000 Inverter Models
Anti-Islanding protectionYes
DC reverse polarity protectionYes
Insulation monitoringYes
DC surge protectionYes, compatible with TYPE II protection class according to EN/IEC 61643-11
AC surge protectionYes, compatible with Type II protection class according to EN/IEC 61643-11
Residual current monitoringYes
AC overcurrent protectionYes
AC short-circuit protectionYes
Overheat protectionYes
Arc fault protectionYes
Battery reverse charging from gridYes
General DataAll Sun2000 Inverter Models
Operating temperature range-25 ~ +60 ºC
Relative operating humidity0 %RH ~ 100 %RH
Max. operating altitude4,000 m (13,123 ft.) (Derating above 2000 m)
CoolingNatural convection
DisplayLED indicators; integrated WLAN + FusionSolar App
CommunicationRS485, WLAN via inverter built-n WLAN moduleEthernet via Smart Dongle-WLAN-FE (Optional); 4G / 3G / 2G via Smart Dongle-4g (Optional
Weight (incl. Mounting bracket)12.9 kg (26.5 lb)
Dimension (incl. Mounting bracket)365mm * 365mm * 156 mm (14.4 x 14.4 x 6.1 inch)
Degree of protectionIP65
Nighttime power consumption< 2.5 W
Optimizer CompatibilityAll Sun2000 Inverter Models
DC MBUS compatible optimizerSun2000-450W-P

This solar inverter’s maximum input PV power is 10,000 Wp if the long strings are fully connected with Sun2000-450W-P power optimisers. It’s operating voltage and maximum input voltage upper limit can reduce to 495 V when you pair the inverter with an LG battery. 

What is the Huawei Sun2000 KTL L1 Solar Inverter’s Output Capacity?

The output capacity of the Sun2000 KTL L1 solar inverter differs on its on-grid or off-grid setup. Here we see the details of the output capacity: 

(On Grid)
Grid connectionSingle phaseSingle phaseSingle phaseSingle phaseSingle phaseSingle phaseSingle phase
Rated output power2,000 W3,000 W3,680 W4,000 W4,600 W5,000 W6,000 W
Max. apparent power2,200 VA3,300 VA3,680 VA4,400 VA5,000 VA5,500 VA6,000 VA
Rated output voltage220 Vac / 230 Vac / 240 Vac220 Vac / 230 Vac / 240 Vac220 Vac / 230 Vac / 240 Vac220 Vac / 230 Vac / 240 Vac220 Vac / 230 Vac / 240 Vac220 Vac / 230 Vac / 240 Vac220 Vac / 230 Vac / 240 Vac
Rated AC grid frequency50 Hz / 60 Hz50 Hz / 60 Hz50 Hz / 60 Hz50 Hz / 60 Hz50 Hz / 60 Hz50 Hz / 60 Hz50 Hz / 60 Hz
Max. output current10 A15 A16 A20 A23 A25 A27.3 A
Adjustable power factor0.8 leading … 0.8 lagging0.8 leading … 0.8 lagging0.8 leading … 0.8 lagging0.8 leading … 0.8 lagging0.8 leading … 0.8 lagging0.8 leading … 0.8 lagging0.8 leading … 0.8 lagging
Max. total harmonic distortion≤ 3%≤ 3%≤ 3%≤ 3%≤ 3%≤ 3%≤ 3%
(On Grid)
Backup Box (Optional)Backup Box – B0Backup Box – B0Backup Box – B0Backup Box – B0Backup Box – B0Backup Box – B0Backup Box – B0
Maximum apparent power2,000 VA3,000 VA3,680 VA4,000 VA4,600 VA5,000 VA5,000 VA
Rated output voltage220 Vac / 230 Vac / 240 Vac220 Vac / 230 Vac / 240 Vac220 Vac / 230 Vac / 240 Vac220 Vac / 230 Vac / 240 Vac220 Vac / 230 Vac / 240 Vac220 Vac / 230 Vac / 240 Vac220 Vac / 230 Vac / 240 Vac
Maximum output current9.1 A13.6 A16.7 A18.2 A20.9 A22.7 A22.7 A
Power factor range0.8 leading … 0.8 lagging0.8 leading … 0.8 lagging0.8 leading … 0.8 lagging0.8 leading … 0.8 lagging0.8 leading … 0.8 lagging0.8 leading … 0.8 lagging0.8 leading … 0.8 lagging

What is the Huawei Sun2000 KTL L1 Solar Inverter’s Efficiency?

Efficiency refers to the amount of DC electricity the system can convert effectively into usable AC electricity.

During operation, the Sun2000 KTL L1 inverter has a maximum efficiency of 98.2% and up to 98.4% depending on the model. The European weighted efficiency, on the other hand, ranges from 96.7% up to 97.8%. It is comparatively higher than competitor rates, which typically alternate between 85 to 95%.

Check the table below to see the specific efficiency rate of each product model.  

Max. efficiency98.2%98.3%98.4%98.4%98.4%98.4%98.4%
European weighted efficiency96.7%97.3%97.3%97.5%97.7%97.8%97.8%

How Many MPP Trackers does the Huawei Sun2000 KTL L1 Solar Inverter have?

Models under the Sun2000 KTL L1 series, including the smallest 2 kW inverters, have two MPPT Trackers with one maximum input number per MPP tracker. This means you can use one inverter for two strings of panels over two orientations.

Does the Huawei Sun2000 KTL L1 Inverter come with an Internal DC Circuit Breaker?

Unfortunately, Sun2000 KTL L1 does not come with an internal DC circuit breaker. The customer has to purchase the said circuit breaker when preparing the cables. 

For DC and battery switches, Huawei recommends purchasing a DC circuit breaker with a rated voltage greater than 600 V DC and a rated current of 20 A. 

Huawei Sun2000 KTL L1 Key Features

Let’s look at the main selling points of the Sun2000 KTL L1: 

  • Active Safety

The inverter has AI-powered active arcing protection and other protection features for your safety. 

Here are the other protection features of the inverter:

  • Anti-Islanding protection
  • DC reverse polarity protection
  • DC surge protection
  • AC surge protection
  • AC overcurrent protection
  • AC short-circuit protection
  • AC overvoltage protection
  • Overheat protection
  • Arc fault protection

  • Compatibility with Optimiser

The inverter is already highly efficient, but it can yield up to 30% additonal energy when combined with an optimiser. You can also selectively install additional orientations power optimisers as an alternative option for your panel than choosing a complete power optimiser or microinverter. 

  • Double Power Battery Ready

The Huawei Sun2000 are hybrid inverters with an inbuilt battery charger for immediate connection, making it a battery-ready inverter.  

Battery-readiness means that device doesn’t require a secondary inverter for its operations. It allows up to 5 kW AC output plus a 5 kW batter charge, helping you save money without compromising the quality of the inverter.

Sun2000 KTL L1 is only compatible with LG Chem RESU 7H_R / 10H_R and Huawei Smart Luna2000 ESS Battery, ranging from 5 kWh to 30 kWh. 

  • Warranty Service

Aside from the warranty period of their products, Huawei offers remote and hardware support for their Australian customers. Such support services are easily accessible through telephone, email, and website for all inquiries. 

  • Natural Cooling

The inverter has natural cooling technology that regulates the temperature of the unit without the need for noisy traditional fans. The absence of fans helps with inverter safety and lowers the risk of corrosion over time. 

  • Design

The inverter is known for its compact and slimline design, which adds an aesthetic appeal that other inverter brands often overlook. All the models are single-phase inverters, meaning that if you have a single-phase connection, this inverter will work best for you.

  • Monitoring

Many inverters don’t come equipped with technology to monitor any voltage fluctuations. But Huawei’s advanced software suite makes its inverters capable of monitoring voltage and responding accordingly.

You can use the Huawei Fusion Home mobile app for direct connection and monitoring via local WiFi and inverter setup. The monitoring portal is very intuitive with a modern user interface.

  • Smart IV Curve Diagnosis

The Sun2000 KTL L1 has an inbuilt intelligent IV Curve Diagnosis, a tool used for real-time monitoring of PV systems and Solar Panel degradation. It ensures that the inverter’s actual performance and specifications are identical to those listed in the warranty. 

The solution uses artificial intelligence algorithms and extensive data analysis to identify different faults, from micro-cracks to blown diodes, automatically. They also give corrective suggestions that ensure reliability and can significantly lower the repair time. 

Additionally, the solution has a remote diagnostic capability, allowing you to scan your system with just one click regardless of location. 

It also has a very fast diagnosis. For instance, it only takes 5 minutes to scan a 5 W system. 

What is the Huawei Sun2000 KTL L1 Solar Inverter’s Warranty?

Huawei has solid warranty and service conditions for the SUN2000 KTL L1 series. They offer a full 10-year warranty on this product that covers the spare device, logistics, and replacement fare. You can also extend the 20-year warranty period, but it comes with an additional cost. 

The warranty starts from the 180th day of the product being shipped from the Huawei factory or the installation date, depending on which occurs first.

As part of their warranty service, Huawei offers support and hardware support for solar inverters. Here are the details of the services:

Service ClassificationService ContentAvailability
Remote SupportHelp DeskTel: 1800046639
09:00 to 18:00 Monday to Friday (UTC+10)
(Business Days only
Remote Technical Support5x8h (response within 30 minutes)
09:00 to 18:00 Monday to Friday (UTC+10)
(Business Days only)
Online Technical Support
Hardware SupportHardware support2 Business Days-Shipment*
Replacement FeeFixed rebate amount excluding GST: 150AUD /incident of Replacement, 25AUD per additional unit when multiple units are replaced at your premises or place of business at the same time. Payment will be processed via EFT within 30 days upon validation of the invoice and the return of the defective unit to Huawei. Huawei only pay the replacement fee to installers and/or retailers, and the replacement fee cannot be paid to end customer.
*Huawei will use commercially reasonable efforts to ship a replacement device within two (2) business days after an RMA is issued. Actual delivery times may vary depending on customer location.

You can read more about the warranty conditions here.  

Is the Huawei Sun2000 KTL L1 Solar Inverter Reliable? Is the Solar Inverter Safe?

Yes, the Sun2000 KTL L1 solar inverter is proven to be a completely safe and reliable inverter. It has met the standard compliance for both safety and grid connection standards. It’s also a top performer and highly rated by PV Evolution Labs (PVEL). 

PV Evolution Labs is internationally renowned for its accurate testing of solar panels’ performance and solar inverter reliability. It independently tests solar panels’ reliability, and companies who want to demonstrate their product’s abilties pay a fee for assessment. 

In 2019, several inverters from the Huawei Sun2000 series were named top performers in the tests featured in the 2019 PV Inverter Scorecard. You can view the categories where Huawei scored in the table below:

CategoryTest Top Performer Ranking
Passive ChamberPassive Chamber Testing
Thermal PerformancePowered Thermal Cycling
High Temperature OperationHuawei Sun2000-11.4KTL-US
Low Temperature OperationHuawei Sun2000-11.4KTL-US
Performance: EfficiencyMPPT EfficiencyHuawei Sun2000-30KTL-US
Conversion EfficiencyHuawei Sun2000-30KTL-US, Huawei Sun2000-375W-USP0
Energy HarvestHuawei Sun2000-28KTL, Huawei Sun2000-30KTL-US
Performance: Operational EnvelopeAC Operational Envelope
DC Operational Envelope
Transient ResponseHuawei Sun2000-11.4KTL-US
Field TestingGround and Arc Fault Tests
30 Day Runtime 

Although the specific test models of the Huawei SUN2000 inverter series were US variants, it’s reasonable to assume that the Australian models possess the same technology and features. 

  • Performance Chamber Testing

Performance Chamber Testing determines how environmental conditions affect the solar inverter’s performance. It builds and expands on the Damp Heat, Thermal Cycling, and Humidity Freeze standards. 

Although the Sun2000 inverters were not listed as top performers in this category, they are definitely on the shortlist. 

  • Thermal Performance

Thermal Performance Characterisation assesses the inverter performance in different operational temperature windows. 

Under this category are the Power Thermal Cycling, High-Temperature Operation, and the Low-Temperature Operation. 

The Power Thermal Cycling is conducted across the full operational range from minimum to maximum operational temperatures.

Meanwhile, High Temperature Operation is conducted by sustaining the inverter in its maximum operational temperature while being powered by a solar array simulator. 

Low Temperature Operation brings the component temperatures to their minimum values by letting the inverter operate after the thermal soak event while sustaining the minimum operational temperature. 

The Sun2000 is ranked as a top performer in High-Temperature and Low-Temperature Operations, meaning the inverter can sustain and operate at both minimum and maximum operational temperatures. 

It also shows that the product will not exceed temperature limits which can lead to the prevention or reduction of inverter lifetime and inverter failure. 

  • Performance Tests

Performance tests evaluate and analyse the performance of an inverter under varying field conditions. 

The Sun2000 is top-ranked for MPPT Efficiency. It means that the inverter is best in tracking a PV system’s maximum power point under a wide range of potential conditions. 

The Conversion Efficiency test determines the inverter’s efficiency in converting DC to AC under different voltage conditions and across multiple power levels from 10% to 100%. As expected, in this test, the Sun2000 outperformed other inverters with two specific models as highly performing inverters.

PVEL quantifies and evaluates expected performance in varying daytime irradiance levels in the Energy Harvest test. The Sun2000 ranked again as high-performing inverters in this test, with two models listed in the top performer list. 

The Transient Response Test is to validate the bounds of inverter operation in response to changes in grid voltage and frequency. Once again, Sun2000 ranked high in this test. 

  • Field Testing

Field tests determine whether an inverter will operate safely and continuously in real-world conditions. 

Once again, the Sun2000 ranked highly for operating continuously for a month in the field with no nuisance tripping or shutting down due to errors. 

Is the Huawei Sun2000 KTL L1 Solar Inverter CEC-Approved?

Yes, Huawei is an approved brand by Australia’s Clean Energy Council (CEC). Specifically, the Sun2000 KTL L1 solar inverter is included in the list of CEC-approved inverters. This means that Huawei met the requirements and passed the tests and the Australian and IEC standards. 

Being listed also means that the inverter is eligble for installation under the Small-scale Renewable Energy Scheme (SRES). 

Aside from the tests and standards to meet, another requirement for the product to be included in the company consists of proof of registration provided by the manufacturer or the certificate holder. 

The Clean Energy Council is an organisation that works with various regulatory bodies from different states and Commonwealth agencies to improve the solar industry’s conduct and standards continuously. They set strict standards for solar panels and inverters, organise training and support for installers, and penalise poor conduct from retailers.

Can you Retrofit a Battery to the Huawei Sun2000 KTL L1 Solar Inverter?

Since the Huawei Sun2000 KTL L1 has a built-in battery charger, there is no need for an extra device or to retrofit a battery. 

Is the Huawei Sun2000 KTL L1 a High-Quality and Valuable Inverter? Our Opinion

With its affordability and high efficiency, Huawei Sun2000 KTL L1 is definitely a high-quality and valuable inverter that is best for a residential project.

While Huawei initially established itself as a telecommunications equipment and consumer electronics business, it has proven its solar product’s reliability with its certifications for compliance with safety and inverter standards.

The company also voluntarily submitted itself to PVEL for testing, which resulted in numerous accolades for its inverter in several tests. Huawei is also CEC-approved and consistently ranked as the number one inverter supplier in the world for five years. 

The inverter’s features are certainly worth the investment. The company has several communication lines, including remote and hardware support, available in different channels if you encounter issues. This gives you plenty of options in contacting them whenever problems arise.

Next Steps…

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