The SUN2000 (SUN2000-KTL-M0) inverters from (5kW to 15kW) are three-phase, grid-tied, transformerless inverters from the Chinese company Huawei. With maximum efficiency of 98.40 – 98.65%, they are virtually the best inverters when it comes to converting DC power to usable AC power.

Inverters are important components of solar PV systems. Without them, the electricity produced by the solar panels cannot be used by appliances in the house. 

However, inverters are the components that fail the most in solar PV systems. So, it’s important to determine and go for high-quality and reliable inverters when going solar.

This article will help you in this regard.

We’ll examine the Huawei SUN2000-KTL-M0 inverters, especially the 5kW to 15kW models.

Specifically, we’ll review:

  • The technical details of the inverter range
  • The performance and reliability 
  • What makes the inverters unique
  • The limitations of the inverters

Let’s get started! Read more about Huawei products.

What is the Huawei SUN2000-KTL-M0 ?

The Sun2000-KTL-M0 is a range of PV string inverters manufactured by Huawei Technologies Co. Ltd. The inverters are some of the most popular, especially in Australia. 

SUN2000 is a three-phase grid-tied PV string inverter that converts DC power produced by your solar panels into AC power used by the house.

It comes in different sizes, from 2kW to 100kW. Each particular model of the SUN2000 inverter is described by its size (power output), its topology, and the product code.

Consider the SUN2000-5KTL-M0 model:

  • A – The product name. In this case, it is SUN2000 – the 3 phase, grid-tied inverter
  • B – Power level. In this case, the output voltage is 5kW 
  • C – Topology. The TL topology means that it is a transformerless inverter
  • D – Product code. The M0 Huawei inverters are those with DC input voltage of 1,100 V

The Huwei SUN2000 Technical Specifciations and Data Sheet

A look at the datasheet of the SUN2000-KTL-M0 inverter tells you that it is a high-quality inverter.

Technical SpecsSUN2000-5KTL-M0SUN2000-6KTL-M0SUN2000-8KTL-M0SUN2000-10KTL-M0SUN2000-12KTL-M0SUN2000-15KTL-M0
Efficiency
Maximum efficiency98.40%98.60%98.60%98.60%98.65%98.65%
European efficiency97.50%97.70%98.00%98.10%98.25%98.30%
Input
Maximum input voltage1,100 V
Operating voltage range140 V – 980 V
Start up voltage200 V
Full-load MPPT voltage range240 – 850 V285 – 850 V380 – 850 V470 – 850 V550 – 850 V580 – 850 V
Rated input voltage600 V
Maximum input current per MPPT 11 A
Number of MPPT trackers2
Number of inputs2
Output
Grid connectionThree phase 
Rated output power5,000 W6,000 W8,000 W10,000 W12,000 W15,000 W
Max apparent power5,500 VA6,600 VA8,800 VA11,000 VA13,200 VA16,500 VA
Maximum output current8.5 A10.1 A13.5 A16.9 A18.4 A25.2 A
Adopted power grid frequency50/ 60 Hz
General Data
Dimension525 mm (W) x 470 mm (H) x 166 mm (D)
Net weight17 kg
Operating temperature-25°C to +60°C 
Cooling modeNatural convection
Topology No transformer
IP ratingIP65
DisplayLED indicators; integrated WLAN + FusionSolar App
CommunicationWLAN, GPRS, 4G

Efficiency

The SUN2000-KTL-M0 inverters are very efficient. Inverter efficiency is the amount of DC electricity that enters the inverter that is converted to usable AC electricity.

Inverter efficiency typically falls between 85% to 95%, with high-quality inverters rated at 90% – 95% efficiency.

But for the SUN2000-KTL-M0 5kW to 15kW models, the peak efficiency is 94.80% to 98.65%. This shows that they are some of the best inverters in the market, at converting received Dc current into AC current.

The European efficiency of the SUN2000 inverters are also very high, with the 5kW to 15kW models ranging from 97.50% – 98.30%. This shows that the inverters perform very well at different power output levels, and not only at the optimal power output. 

MPPT Inputs

With a wide operating voltage range and the presence of more than one input point and MPP tracker, the SUN2000-KTL-M0 inverters will function properly under different conditions. 

Operating Voltage Range

The operating voltage range of the SUN2000 5kW – 15kW inverters is 140 V to 980 V.

In a solar PV system, input voltage changes depending on illumination and temperature. A good inverter will have a wide operating voltage range, so that it’ll be able to work properly under a range of conditions. 

Multiple input levels and MPPTs

The SUN2000-KTL-M0 5kW – 15kW models have 2 two inputs and 2 MPP trackers. Each input has an MPP tracker. This means that the one inverter can be used for 2 strings of panels. 

In a typical string inverter, the solar panels are connected in a series strings, and the string is connected to the inverter. The result is that the system will function at the level of the least performing module. That is, if partial shading causes a module to function at 75%, every module in the string will function at 75%. 

But with these SUN2000-KTL-M0 inverters under review having 2 input levels, they allow a PV system to have two strings of panels working independently. This way, if conditions cause one string not to operate optimally, the second string can still operate optimally, thereby minimising your power losses.

Output

With a wide range of power ratings, the SUN2000-KTL-M0 inverters are available for both residential and commercial applications.

Inverter Size

The SUN2000-KTL-M0 inverters are available from 2kW to 100kW. Thus, you’ll be able to find an inverter that matches the size of the PV system you want. This also makes the inverters available at different price points to fit every budget.

The 5kW – 8kW models are excellent for residential applications, while the 10kW – 15kW models are excellent for small businesses.

Grid Connection

The SUN2000-KTLM0 5kW – 15kW models are all three-phase inverters. If you have a three-phase connection, then you need a 3 phase solar inverter that matches your connection. 

SUN2000-KTL-M0 Dimensions & Other Information

The SUN2000-KTL-M0 inverters come with solid features like top-rated weather protection, a unique cooling system, and a transformerless topology that makes it efficient, compact, and relatively inexpensive. 

Dimension and Weight

The SUN2000 inverters are very compact and portable. They measure only 525 (W) x 470 (H) x 166 (D) millimetres. 

The inverters are also relatively light. They weigh just 17kg with the hanging kits (albeit without the mounting brackets).

Degree of Protection

The SUN2000-KTL-M0 inverters have an ingress protection (IP) rating of 65. The IP rating defines the degree of protection provided by an enclosure of electrical equipment against intrusion, dust, and water.

The IP65 rating of the SUN2000 inverters means that their casing is dust-proof and provides protection from low-pressure water from any direction.

Cooling

The aluminium casings of the SUN2000 inverters come with a heat sink at the back. This allows the inverter to be cooled by natural convection.

Thus, the SUN2000 is unlike most inverters that use fans for cooling. The special indentations of the rear heat sink allow hot air to flow out and cool air to flow in, thereby cooling the inverters. 

In tests carried out by PV Evolution Labs (PVEL) in 2019, some of the SUN2000 models were named top performers in different categories, including high and low-temperature operation. 

Topology

The “TL” in the model name of the SUN2000-KTL-M0 inverters means “Transformer-less”. These inverters do not have a transformer. A simple multi-step process does the transformer’s work in the conventional inverters.

Being transformerless makes the SUN2000 inverters are very efficient. This is because they avoid the internal energy losses associated with the operation of a transformer. 

Not having a transformer also means that the SUN2000 inverters have less components. This is one reason why they can afford to be compact and portable. It also means that the inverters dodge the cost of extra components, allowing them to be available at relatively low price points.

Is the Huawei Sun 2000 inverter reliable? 

The SUN2000-KTL-M0 inverters are high performing and reliable units that are highly rated by PVEL.

PVEL is a leading independent lab of the downstream solar industry.  It provides performance and reliability testing for solar PV and storage technology. A top performer in PVEL tests is a high-quality and reliable inverter.

A number of SUN2000 inverters were top performers in the tests featured in the 2019 PVEL Scorecard

Test CategorySUN2000 top performer
Passive Chamber TestingDamp Heat
Thermal Cycling
Humidity Freeze
Thermal Performance CharacterizationPowered Thermal Cycling
High-Temperature Operation
Low-Temperature Operation
Performance Testing EfficiencyMPPT Efficiency
Conversion Efficiency
Energy Harvest
Performance Testing: Operational WindowAC Operational Window
DC Operational Window
Transient Response
Field TestingGround and Arc Fault
30-Day Runtime

Passive Camber Testing

While SUN2000 inverters did not manage top performer rating in this category, they definitely were on the podium. 

These tests were to determine the impact of environmental conditions on performance. The SUN2000 inverters had gone through the tests and came out without revealing any reliability issues.

There were no such things as water condensation in wiring compartments, corrosion, coating delamination, discolouration and melting of external displays, or electromagnetic fatigue of electrical connections.

Efficiency Performance

You’ll notice that SUN2000 inverters were rated the top inverters in every category of efficiency performance testing. 

Under MPPT efficiency, the test assessed the ability of the inverters to track a PV’s system maximum power point under a wide range of conditions (such as irradiance, soiling, droppings, clouds, shading, and module temperature). The SUN2000 was the best at tracking the MPP during low rates of change, high rates of change, and static electrical conditions.  

Under conversion efficiency, the test assessed the efficiency at which an inverter converts DC to AC under different voltage conditions and power levels ranging from 10% to 100%. Again, the SUN2000 outperformed every other inverter. 

The energy harvest test looked at the inverter’s efficiency at converting DC to AC at varying daytime irradiance levels – morning start-up, full day operation, and evening shut-down. Again, the SUN2000 inverter was a winner. 

Thermal Performance

For the thermal performance test, multiple components along the main path of the inverter are monitored using thermocouple sensors. The SUN2000 came out best in sustaining both the maximum and minimum operational temperatures.

In other words, these inverters will not exceed temperature limits. Thus, with that, you’ll dodge one problem that reduces the lifetime of inverter components and causes inverter failure.

Field Testing

The field testing determines if inverters will operate safely and continuously in real-world conditions. The inverters were connected to the grid for 30 days, and energy production was measured at 5-minutes intervals. The SUN2000 inverters also came out on top as there were no nuisance tripping or shutting down whatsoever.

Huawei Sun 2000 Unique Features and Benefits

The SUN2000-KTL-M0 inverters stand separate from others in a variety of ways. These include: 

  • Being battery ready inverters
  • Cooling by natural convection
  • Having a buttonless appearance
  • Offering a smart IV curve diagnosis

It’s a solar battery-ready inverter

The SUN2000-KTL-M0 5kW – 15kW models are all battery ready inverters. They come with an interface for coupling with a DC high voltage battery – such as the Huawei Luna Solar Battery.

This means that when using these solar inverters, you don’t need a separate battery inverter. 

They employ cooling by natural convection

Another thing that makes the SUN2000-KTL-M0 inverters unique is their rear heat sink. This feature replaces the conventional cooling fans in keeping the temperature of the inverter within acceptable limits.

The heat sink is even more efficient than cooling fans because it allows noiseless operation. While inverters with cooling fans produce noise of 50dB or more, the SUN2000 inverters operate at 29dB noise level. This makes them excellent for environments where quietness is desired, like libraries and hospitals.

They have a buttonless appearance

Another thing that makes the SUN2000 inverters unique is the absence of displays and buttons.

Most inverters have buttons and LCDs for viewing certain system data and inverter error codes. However, the SUN2000 comes with a very minimalistic interface. It features just 3 LED indicators on the front panel and nothing else.

One advantage of this LCD-less and button-less interface is that the inverters have fewer points of failure.

They have smart IV curve diagnosis

The smart IV Curve Diagnosis is one of the sweetest advantages of Huawei SUN2000 inverters. It is a tool for real-time monitoring of PV systems.

It uses Artificial Intelligence to create an IV curve that can help you identify issues with the system. With the solution, you can automatically detect different faults, from blown diodes to micro-cracks and more. 

It’ll also provide corrective suggestions that significantly reduce repair time and ensure reliability. 

Another advantage of this solution is its remote diagnostic capability. You can scan the system, with just one click, from anywhere you are. 

The diagnosis is also very fast. For example, it’ll take only 5 minutes to scan a 5W system completely.  

Access to the Fusion Cloud Solar Monitoring App

Monitor your energy usage with Huawei’s smart monitoring app that will allow homeowners to get a better understanding of their energy usage patterns.

You can check a number of performance metrics such as system output, energy consumption and more.

The Sun 2000’s Limitations As An Inverter

As great as the SUN2000-KTL inverters are, there are a few limitations. These include:

  • Absence of an EPS mode
  • Absence of LCD for set-up 
  • Relatively short warranty

Absence of an EPS (Emergency Power Supply)

The SUN2000 inverters don’t have a built-in EPS, which means that you can’t get backup power if there is a grid outage.

Usually, when there is a grid outage, the safety system in a grid-tied inverter shuts the system down. This prevents the system from exporting power to the grid so that workers trying to fix the outage will not get electrocuted. 

In inverters with EPS mode, the component will provide the backup power while the outage lasts. Since the SUN2000 inverters don’t come with EPS, you’ll have to add the component, which comes at an additional cost (about $500).

Absence of LCD screen

While the minimalistic interface of the SUN2000 inverters means that failure points are reduced, it also means that there’s no LCD screen for set-up.

Thus, the setup of the inverters must be through WiFi. However, it is relatively straightforward.

Relatively short warranty period

The solar inverters come with a standard 5 years (60 months) warranty. This is relatively too short considering the lifespan of solar panels, as well as the industry standard.

Fortunately, you can extend (buy) your warranty by another 5, 10, or 15 years. Thus, you can get 10 years to 20 years warranty on your Huawei SUN2000 inverter.

Final Verdict

Huawei may be a relatively recent player in the solar PV market, but it already has some of the best solar inverters. 

The company’s SUN200-KTL-M0 range inverters are really setting the standard for performance and reliability. 

The inverters are highly efficient. When it comes to converting DC to AC under a broad spectrum of DC voltage levels, string configurations, ambient temperatures, and irradiance levels, the SUN2000 inverters top every other inverter.

They are also built to last. The absence of a cooling fan, LCD, and buttons means fewer failure points. And they come with a reliable IP65 protection rating.

Within the 5kW – 15kW models of the SUN2000-KTL-M0 range, you’ll find inverters excellent for both residential and commercial applications.

Check Out Our Guides to Solar Inverters

We have a series of unique guides to solar, solar finance, batteries and more, if you are looking to do more in-depth research into solar inverters check the below:

1. What Are Solar Inverters? How Do They Work?
The solar inverter is a very important part of your solar power system: photovoltaic panels generate direct current (DC) when they receive sunlight, but your home appliances run with alternating current (AC) like that from the grid. In simple terms, the solar inverter is the device in charge of converting DC power to AC. 

2. How To Choose A Solar Inverter
There has never been a better time to switch to solar in Australia. Some households can even switch for $0. As the focus grows on solar energy, so does the list of available equipment. The solar inverter is like the heart of a solar system, and there are a number of considerations that go into choosing a suitable solar inverter.

3. Single-Phase vs Three-Phase Inverters: What Are They And Which One Do You Need?
Here is a common rule of thumb to help differentiate between single-phase vs three-phase inverters. Residential homes will usually use a single-phase power supply or inverter, while commercial or industrial facilities will use three-phase supplies.

4. What Do Solar Inverter Error Codes Mean
Solar inverter error codes notify you of a situation threatening the normal operation of your solar power system. Many different things can go wrong and disrupt electricity generation from a solar PV system. The inverter will detect it and generate corresponding error codes to notify you.

Next Steps

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