What is a string inverter?

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The string inverter is to directly transform the DC electricity generated by photovoltaic components into a summary of AC power and the grid. Therefore, the power of the inverter is relatively small, and the photovoltaic power station generally uses a group -type photovoltaic inverter below 50kW.

The group-type inverter is based on the concept of modularization. Each photovoltaic group (1-5kW) consists of a inverter and a few battery boards form a group string. The small power single -phase inverter has the maximum power peak tracking at the DC end. It has become the most popular inverter in the international market in the current international market. So what are the advantages and disadvantages of a group -type inverter?


1. The advantages of a group string inverter

1. The volume of the group -type grid -connected inverter is small and light, and it is very convenient to carry and install. It does not require professional tools and equipment, and no special power distribution room is required. Reduce occupation, and the DC line connection does not require DC convergence boxes and DC power distribution cabinets.

2. The MPPT voltage range is wide in the group, generally 250-800V, and the component configuration is more flexible. On rainy days, there are many foggy parts, and the power generation time is long.

3. The group -type inverter adopts a modular design. The DC end has multi -way MPPT functions. The situation where the work point does not match the inverter, which increases the power generation to the greatest extent.

4. The group series also has the advantages of low self -consumption, small failure effect, and convenient replacement and maintenance.


Second, the disadvantage of a group string inverter

1. When multiple inverters are connected in parallel, the total harmonic is high. The single inverter THDI can be controlled to more than 2%, but if more than 40 inverters are connected in parallel, the total harmonic will be added, and it is difficult to suppress it. , Prone to resonance.

2. There are many electronic components. The power device and signal circuit are on the same board. The design and manufacturing is difficult and the reliability is slightly worse. The power device is small, and it is not suitable for high -altitude areas. Outdoor installation, wind blowing sun exposure can easily lead to aging shells and heat dissipation pieces.

3. Large ground power stations, the number of group -type inverters is large, the total failure rate will increase, and the system monitoring is difficult.

4. When multiple inverters are connected in parallel, the total harmonic is high. The single inverter THDI can be controlled to more than 2%, but if more than 40 inverters are connected in parallel, the total harmonic will be added, and it is difficult to suppress it. , Prone to resonance.


What is a miniature inverter?

Micro -inverters generally refer to inverters with power in the photovoltaic power generation system less than watts and component -level MPPT. The full name is the micro photovoltaic grid -connected inverter. "Micro" is relative to the traditional concentrated inverter. The traditional photovoltaic inverter method is to connect all the DC electricity generated by all photovoltaic batteries under the sun, and then turn the DC power into AC power to the grid by a inverter; Reverse.

1. The advantages of miniature inverters

Each component can perform independent MPPT control, which can greatly improve the overall efficiency. At the same time, it can also avoid the DC high pressure, poor light effects, and barrel effects of centralized inverters.


Second, the disadvantages of micro inverters

The price is expensive, the maintenance cost is high, and because each solar panel on the roof is connected to a miniature inverter, there are many expensive metal devices on it.


Summarize:
Considering the different types and disadvantages of the different types of inverters, the string inverter is still the mainstream choice of the market. As a new technology, the micro inverter is still in the rapid development stage, but it is necessary to face challenges in difficulties and high product technology thresholds.

author: SVC ENERGY

-04-11

In rooftop solar system, there are three main types: string inverters, microinverters and string inverter power optimizers. String inverters is the most common and traditional types. In this artichle, we give a furtur inctroduction about string inverters.

What is string inverters? How do string inverters work?

Solar string inverters, or central inverters, are devices that convert the energy(DC currents) generated by the solar array to usable AC electricity for home appliances.

It is connected to multiple solar panels that are attached in series to boost the power rating. The conversion is typically performed in the central of solar string inverters.

Advantages of string inverters

• Lower costs

• Wide MPPT voltage range with flexible configuration

• Easy maintenance and replacement

• Performs well with no shade

Disadvantages of string inverters

• Single point of failure may lead to significant loss of elecricity production

• Unable to monitor each panel individually

• More expensive to increase solar panels

• Not avilable for the roofs with shading issues

  If you are looking for more details, kindly visit Multi String Inverter for Germany.

String inverters VS. microinverters

Microinverter systems are typically expensive than string inverters as microinverter is individually installed on the back of each panel.

In system with solar string inverters, the conversion of electricity is performed in inverters. But in microinverter systems, it is processed in solar panels.

Microinverter systems provide power production monitoring on each panel individually.

String inverters are the most commonly installed worldwide.

What are string inverter systems

In string inverter systems, solar panels are wired in series. Then connected by a single string to a string inverter. String inverter combines all the direct current from each solar panel at once, transforming to alternating current.

In string inverter power opitimizer systems, the working mode is basically same with the string inverter systems. But with additional opitimizers have installed on each solar panel individually to monitor the performance of solar panel.

What is MPPT in string inverters

Maximum Power Point Tracking (MPPT for short) is an electrical system that enables photovoltaic panels to output more electrical energy by adjusting the working state of electrical modules. It can ensure the energy generated by solar panels is effectively stored in batteries.

When to use string inverters for solar panel systems

String inverters are the most effective and affordable solutions in solar panel systems if there is abundant southern exposure of your roof and without any shading from nearby trees or chimneys. String inverters are standard inverters over decades of use in the residential and commercial solar industry.  

Best string inverters recommendation

VMH Off-grid Solar Inverter 3-5KVA

VML Off-grid Solar Inverter 1-5KVA

MPS Low Frequency Off-Grid Solar Inverter

Contact us to discuss your requirements of Solar Panel String Inverter for Germany. Our experienced sales team can help you identify the options that best suit your needs.