2. Series inverter MPPT voltage range is wide, generally 250-800V, component configuration is more flexible. In rainy days, foggy areas, power generation time is long.
3. Series grid-connected inverter small size, light weight, handling and installation are very convenient, do not need professional tools and equipment, do not need special distribution room, in a variety of applications can simplify the construction, reduce the floor space, DC line connection does not need DC busbar and DC distribution cabinet. The series type also has the advantages of low power consumption, small fault impact, easy replacement and maintenance.
The main disadvantages are:
1. There are more electronic components, power devices and signal circuits on the same board, which is difficult to design and manufacture, and the reliability is slightly poor.
2. The power device has a small electrical gap and is not suitable for high altitude areas. Outdoor installation, wind and sun easily lead to aging of the shell and heat sink.
3. Without isolation transformer design, electrical safety is slightly poor, not suitable for film component negative grounding system, DC component is large, great impact on the power grid.
4. When multiple inverters are in parallel, the total harmonics are high, and the THDI of a single inverter can be controlled to more than 2%, but if more than 40 inverters are in parallel, the total harmonics will be superimposed. And more difficult to suppress.
5. The number of inverters is large, the total failure rate will increase, and the system monitoring is difficult.
6. No DC circuit breaker and AC circuit breaker, no DC fuse, when the system fails, it is not easy to disconnect.
7. A single inverter can achieve the zero voltage crossing function, but when multiple machines are in parallel, the zero voltage crossing function, reactive power regulation, active power regulation and other functions are difficult to achieve.
Pros: Too advanced. Cons: Too advanced.
1, IP65 protection level (other manufacturers for IP54 or IP55), this design can effectively deal with the adverse natural environment to Huawei photovoltaic inverter damage, reduce failures, extend the service life.
2, as a communications expert, Huawei has more than 20 years of professional lightning protection experience, and its unique lightning protection patent effectively avoids lightning damage to the inverter.
3, no fuse design. \"Two-way group string one MPPT\" design, focus on product quality, increase modules to avoid the use of fuses, reduce maintenance costs.
4, no fan design, natural heat dissipation. The heat isolation and heat shielding technologies are used to allocate heat generating devices and heat sensitive devices into different cavities to ensure that there are no local hot spots and improve heat dissipation reliability. Reduced power generation efficiency and maintenance costs due to fan damage.
5. Adopt 4G wireless communication technology to build intelligent management network. Customers can monitor power generation anytime, anywhere.
1, IP65 protection level (other manufacturers for IP54 or IP55), this design can effectively deal with the adverse natural environment to Huawei photovoltaic inverter damage, reduce failures, extend the service life.
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2, as a communications expert, Huawei has more than 20 years of professional lightning protection experience, and its unique lightning protection patent effectively avoids lightning damage to the inverter.