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Inverter Test & Comparison 2024 - Top 7 Manufacturers & Practical Test Winner

Every PV system requires an inverter because without it, the generated power couldn't be utilized. But what should you consider when purchasing an inverter? We at Offgridtec explain the functionality as well as the key factors in the purchasing decision and compare our top 7 inverter manufacturers.

What is the purpose of an inverter?

Solar cells in photovoltaic modules generate direct current (DC) from sunlight. However, households require alternating current (AC). Therefore, the generated DC needs to be converted. This is where the inverter comes into play. It converts DC into AC, which can then be directly used by electrical devices in our homes. Ensuring that the electricity has the correct frequency is also important for grid connection. Thus, the inverter is an essential component in every solar installation.

Finding the right inverter - What to consider

When purchasing an inverter, there are several criteria to consider in order to find the suitable device. Firstly, it's important to choose the right type of inverter. Different types of inverters are used for different sizes of PV systems. Let's briefly introduce the various types:

Firstly, there are the module inverters, also known as microinverters, which convert the power of a single module into AC. They are smaller and can optimize each individual module using a maximum power point (MPP) tracker. While this sounds advantageous, microinverters are generally less powerful and less efficient. As a result, they are mainly used in small balcony solar systems and "complicated" PV systems where the solar panels are oriented differently.

If you have a smaller system with a capacity of up to 6 kWp, a single-phase inverter could be the right choice for you. With this inverter, you can efficiently generate the alternating current needed in your household. Another advantage of single-phase inverters is that they are more cost-effective than their counterparts.

Indeed, we are now on the topic of three-phase inverters. These are suitable for use in larger PV systems or when your power consumption fluctuates significantly. They are capable of delivering higher power outputs and offer improved power regulation. While they are somewhat more expensive and their installation is a bit more complex, three-phase inverters are significantly more efficient than single-phase ones, especially for larger systems. In the long run, this investment can certainly pay off.

Our test winner: Hoymiles

The winner of our comparison is Hoymiles, a leading manufacturer of innovative solar inverters. With Hoymiles micro inverters, you have the opportunity to switch to solar energy cost-effectively. The inverters demonstrate proven quality, allowing you to utilize solar energy as efficiently as possible. Additionally, the installation of the products is very simple, and operation and monitoring are straightforward.

At Hoymiles, you have a choice between three model series:

• HM Series
• HMT Series
• HMS Series

The models of the HM Series are very compact and specifically designed for small solar installations with limited space requirements. They provide a cost-effective solution for solar energy projects where the power requirement per module does not exceed 300 W.
On the other hand, the HMT models achieve a power output of up to 600 W per module, making them an ideal reliable and efficient solution for small to medium-sized solar installations.
Lastly, there are the models of the HMS Series, which stand out for their comparatively high power output of up to 1200 W per module. They are therefore used in larger solar installations and in demanding environments.

2nd place: Victron Energy

Securing the second position is Victron Energy - a brand that ranks among the world's leading manufacturers of energy solutions in the field of off-grid power supply. The inverters are designed to reliably and efficiently power a wide range of applications, including:

• Innovative energy storage systems for household use 
• Maritime or mobile solar modules

and much more.

Setting new standards is the MultiPlus inverter. The MultiPlus series includes powerful inverter chargers suitable for various off-grid power supply applications. For small to larger solar installations and off-grid applications, there are various MultiPlus models ranging from 1200 VA with a charging current of 13 to 50 amps. On the other hand, the MultiPlus-II, with its impressive 15,000 VA power and a charging current of 200 amps, is ideally suited for large solar installations and industrial applications.

Platz 3: Offgridtec

Taking the third spot is Offgridtec. This German company focuses on both in-house manufacturing and collaboration with industry-leading partners for all its products. The production process prioritizes top-notch quality, safety, and reliable service. This commitment is evident in their inverters.

These inverters boast proven quality and state-of-the-art manufacturing. All components used are of high quality, ensuring long-term durability of the products. Additionally, all inverters are produced according to current standards to guarantee the highest safety and performance standards.

4th place: Growatt

Chinese inverter manufacturer Growatt takes the fourth spot in our ranking. It is renowned for its cost-effective solar inverters with high efficiency. Cutting-edge technologies, along with high quality and reliability, define Growatt products. Through rigorous quality control, the company ensures that its products meet the highest standards. Even under challenging conditions such as high temperatures and humidity, the inverters maintain good performance.

Moreover, user-friendliness is a top priority for Growatt inverters. The company offers products that are easy and intuitive to install, operate, and maintain. Additionally, the inverters feature a user-friendly LCD display, allowing comprehensive system performance monitoring. Manufactured without fans, they boast a long lifespan.

5th place: Votronic

For over 30 years, Votronic has been manufacturing electronic devices for mobile applications. Therefore, it is well-deserved that the German company claims the 5th spot, having successfully established itself in the market with high-quality and innovative product lines.
The Votronic MobilePOWER Inverters from the SMI SINUS series are designed to convert the 12 V battery voltage into a pure sine wave 230 V alternating voltage, similar to the power supply in our households. This allows all electrical devices to be used on the go, as if they were connected to the normal power grid.

These inverters are specifically developed for reliable operation in special-purpose vehicles, as well as high-quality motorhomes. They utilize modern switch-mode technology, are compact and lightweight, and despite low energy consumption, deliver high output power values. Overall, Votronic inverters demonstrate proven quality and high reliability.

6th place: Huawei

Taking the 6th spot is Huawei. The Chinese electronics manufacturer, known for smartphones and other devices, also produces inverters and ranks among the largest manufacturers globally in this field. With over 30 years of experience in solar technology, you can rely on Huawei inverters to exhibit high quality.

The flagship product line from Huawei is the SUN2000 series. The inverters in this series are synonymous with high quality, reliability, and efficiency. They are designed for various applications, ranging from small residential installations to large commercial PV systems. These inverters incorporate innovative technologies and come equipped with advanced performance management, monitoring, and diagnostic features, allowing you to optimize solar energy usage. Additionally, they boast a modern and appealing design that facilitates easy installation and operation. Thanks to intelligent cloud solutions, remote monitoring of the systems is also possible.

7th place: EcoFlow

EcoFlow concludes our ranking, securing the 7th spot. The company is committed to developing innovative and environmentally friendly solutions to make individuals, families, and societies independent from the grid. In line with this mission, EcoFlow has introduced the PowerStream, a clever inverter that turns any household power station into a balcony solar storage system.

The PowerStream inverter is compatible with other EcoFlow devices, forming its own eco-system along with other products, offering many advantages. The inverter's efficiency ranges from 96-98%. Additionally, you have the option to connect a power storage unit to the inverter and optimize consumption via Wi-Fi interface. Moreover, it is easy to set up and regularly undergoes updates.