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 1000 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.
