Login
3-phase inverters - Efficient solution for larger solar systems
Three-phase inverters are the ideal choice for larger solar systems from 10 kW, especially in commercial and industrial applications. They enable even power distribution, higher output capacities and ensure maximum efficiency. These inverters are robust, durable and offer intelligent monitoring functions for easy system control.
Manufacturers such as Huawei, Fronius and SolarEdge stand for innovative technologies and reliable quality. Ideal for large rooftop and ground-mounted systems, 3-phase inverters ensure a stable energy supply and help to reduce electricity costs in the long term. Use this powerful technology to implement your solar project efficiently and future-proof.
Leading brands for 3-phase inverters
Manufacturers such as Huawei, Fronius and SolarEdge stand for innovative technologies and reliable quality. Ideal for large rooftop and ground-mounted systems, 3-phase inverters ensure a stable energy supply and help to reduce electricity costs in the long term. Use this powerful technology to implement your solar project efficiently and future-proof.
Leading brands for 3-phase inverters
What is a 3-phase inverter?
A 3-phase inverter is a central component of larger photovoltaic systems. It converts the direct current (DC) generated by the solar modules into three-phase alternating current (AC), which is either fed directly into the public grid or used for self-consumption.
In contrast to single-phase inverters, a 3-phase inverter distributes the generated current evenly across three current phases, which keeps the grid more stable and avoids load peaks.
This technology is especially designed for commercial, industrial and large private PV systems from around 10 kW and forms the basis for efficient energy conversion, grid stability and high power reserves.
In contrast to single-phase inverters, a 3-phase inverter distributes the generated current evenly across three current phases, which keeps the grid more stable and avoids load peaks.
This technology is especially designed for commercial, industrial and large private PV systems from around 10 kW and forms the basis for efficient energy conversion, grid stability and high power reserves.
How does a 3-phase inverter work?
The inverter generates three synchronized AC phases from the solar power, which adapt exactly to the specifications of the public power grid. This three-phase feed-in ensures that
- power peaks are smoothed
- System efficiency is increased
- minimizes feedback effects on the power grid
In addition, modern 3-phase inverters 2025 enable the integration of battery storage, real-time yield monitoring and, in many cases, smart grid communication, making them a future-proof solution for large solar installations.
Advantages of 3-phase inverters
1. high energy efficiency
By distributing the electrical load evenly across three phases, the solar power generated is used particularly efficiently. Losses are minimized and system performance is optimized - ideal for large PV systems with permanently high power requirements.
By distributing the electrical load evenly across three phases, the solar power generated is used particularly efficiently. Losses are minimized and system performance is optimized - ideal for large PV systems with permanently high power requirements.
2. optimum grid compatibility
In countries with a three-phase grid structure (such as Germany or Austria), three-phase inverters offer significantly better integration into the public grid. Feedback effects on the grid are reduced, which increases grid stability.
In countries with a three-phase grid structure (such as Germany or Austria), three-phase inverters offer significantly better integration into the public grid. Feedback effects on the grid are reduced, which increases grid stability.
3. ideal for larger systems
From a system size of approx. 10 kWp, 3-phase devices are the most economical and technically sensible choice. They are particularly suitable for commercial buildings, industrial halls or apartment buildings.
From a system size of approx. 10 kWp, 3-phase devices are the most economical and technically sensible choice. They are particularly suitable for commercial buildings, industrial halls or apartment buildings.
4. load distribution and grid stability
Thanks to the even load distribution, voltage differences are avoided - even with fluctuating solar radiation or high system loads.
Thanks to the even load distribution, voltage differences are avoided - even with fluctuating solar radiation or high system loads.
5. high scalability
3-phase inverters can be easily integrated into modular, scalable systems. They enable the uncomplicated expansion of solar systems when energy demand increases.
3-phase inverters can be easily integrated into modular, scalable systems. They enable the uncomplicated expansion of solar systems when energy demand increases.
6. storage compatibility and smart grid ready
Modern models (as of 2025) are compatible with powerful battery storage systems and have intelligent functions for grid control and self-consumption optimization.
Modern models (as of 2025) are compatible with powerful battery storage systems and have intelligent functions for grid control and self-consumption optimization.
7. future-proof
By supporting dynamic feed-in control, real-time monitoring and remote maintenance, 3-phase inverters are a future-proof investment - also with regard to new legal requirements.
By supporting dynamic feed-in control, real-time monitoring and remote maintenance, 3-phase inverters are a future-proof investment - also with regard to new legal requirements.
Disadvantages of 3-phase inverters
1. higher acquisition costs
The devices are generally more expensive than single-phase models - both to purchase and to install. This usually only pays off from a certain system size.
The devices are generally more expensive than single-phase models - both to purchase and to install. This usually only pays off from a certain system size.
2. more complex installation
Integration into the power grid requires three-phase electrical connections and special expertise. In residential buildings with a single-phase grid connection, a grid upgrade is often necessary.
Integration into the power grid requires three-phase electrical connections and special expertise. In residential buildings with a single-phase grid connection, a grid upgrade is often necessary.
3. oversizing for small systems
For systems under approx. 10 kW, 3-phase inverters are often not economical. Single-phase models are the more efficient solution here.
For systems under approx. 10 kW, 3-phase inverters are often not economical. Single-phase models are the more efficient solution here.
4. higher space requirement
Due to the power and technology, the devices are usually larger and require more installation space.
Due to the power and technology, the devices are usually larger and require more installation space.
5. maintenance and repair can be more complex
The more complex technology can result in higher repair costs when servicing is required - especially for older or particularly powerful models.
The more complex technology can result in higher repair costs when servicing is required - especially for older or particularly powerful models.
Leading suppliers of 3-phase inverters on SolarTraders
- Huawei offers 3-phase inverters with high efficiency and advanced technology. They are characterized by their reliability and user-friendly integration.
- Fronius is known for its robust and durable 3-phase inverters. They offer high performance and excellent system stability.
- SolarEdge convinces with innovative 3-phase inverters that offer optimal performance and user-friendly monitoring.
- SMA offers 3-phase inverters that are known for their reliability and advanced technology. They are ideal for larger solar installations and commercial applications.
- Goodwe manufactures cost-effective 3-phase inverters with high efficiency and easy installation process. They offer a good solution for medium to large systems.
- Sungrow Power offers powerful 3-phase inverters that are known for their high efficiency and flexibility. They offer high performance and are ideal for large-scale solar installations.
Areas of application for 3-phase inverters
3-phase inverters are used wherever there are high performance requirements and a stable energy supply is essential. Typical areas of application:
- Commercial photovoltaic systems: 3-phase inverters are ideal for office complexes, warehouses, hotels or supermarkets with high daily power consumption. They enable a reliable and efficient energy supply.
- Industrial solar systems: In production plants or industrial parks with a high load profile, these devices ensure even load distribution and grid stability - even at high capacity utilization.
- Large rooftop and ground-mounted systems: From around 10 kWp, 3-phase systems are the better economic choice - especially for photovoltaic projects with potential for expansion.
-
Apartment buildings and residential areas: In buildings with multiple electricity meters or more complex load profiles, 3-phase inverters offer an equitable distribution of the electricity generated.
Compatibility with different PV system architectures
High adaptability:
Modern 3-phase inverters (as of 2025) are compatible with almost all PV setups - from classic string systems to modular multi-string configurations. They work reliably with bifacial solar modules, optimized modules or power optimizers.
Storage integration & smart grid compatibility:
Thanks to integrated interfaces, battery storage systems such as lithium-ion systems can be seamlessly integrated. This allows excess solar power to be stored efficiently and accessed when required - increasing self-consumption and improving grid independence. In addition, many devices are "smart grid ready" and meet current grid requirements in accordance with VDE-AR-N 4105 or 4110.
Alternative for smaller systems: 1-phase inverters
Single-phase inverters are the ideal choice for solar systems with low energy requirements - for example in single-family homes or small commercial enterprises. They efficiently convert the direct current generated by PV modules into single-phase alternating current, which can be used directly in the household or fed into the grid.
Thanks to their compact design and simple installation, single-phase systems are particularly cost-efficient and low-maintenance. In regions with a single-phase grid supply, they offer an optimal solution without the need for additional retrofitting.
