1, safe
The traditional centralized inverter or series inverter usually has a DC voltage of several hundred volts to several thousand volts, which is easy to catch fire and difficult to put out after fire. Micro-reactors only have a DC voltage of tens of volts, all of which are connected in parallel, which minimizes the potential safety hazard.
-It is true that the voltage of the micro inverter is low, but the high voltage does not mean that it will catch fire. At present, all large-scale photovoltaic power plants and commercial industrial roofs in China are centralized or series inverters, and the DC voltage is about 600V V V. Photovoltaic power plants have been built for more than ten years. Have you ever heard of which power station is on fire? Low pressure can indeed avoid fire hazards, but the investment has increased a lot. For example, staying at home can avoid car accidents, but if there is money to pick up in the street, we still have to go.
2. Intelligence
Component-level monitoring, you can see the working state of each component in ECU.
-It is the advantage of micro inverter, but it has no economic benefit.
3. Generate more electricity
Component-level MPPT has no barrel effect, which reduces the influence of shading on power generation; The low light effect is good, because the starting voltage is low, only 24V, and it can work in low light.
-MPPT is the best power point for tracking photovoltaic panels. If the installation angles of photovoltaic panels are different, or some photovoltaic panels are blocked when the sun shines obliquely in the morning and evening, the MPPT of micro-anti-module level has obvious advantages. If all photovoltaic modules on the roof are installed at different angles, this function will not show its advantages. For a conventional roof of tens of square meters, there is little difference in the installation of each component, that is, the best working point of each component is the same, and component-level MPPT has no advantage.
4. Long service life
The design life of general micro-inverse is 25 years, while the design life of traditional inverter is 10 years.
-this is a bit far-fetched. The design life of traditional inverter calibration is also 25 years. In addition, design life or service life is a false concept. Design life is 25 years, 10 years wear. Will the supplier compensate you for a new one? Shelf life is the key. Don't listen to the supplier's promotion of life for several years, just let him give you a warranty for several years.
5, convenient and beautiful
There is no need to build a special power distribution room, and the micro-inverse can be directly installed behind the components or on the bracket. Because it is a parallel structure, it can be installed directly in the later stage without changing the previous configuration.
-It's not an advantage. The series inverter is also installed as a bracket, and the later expansion does not need to change the previous configuration.
Every time a new product comes out, suppliers need to sum up some advantages in order to change users' usage habits. How to choose a product ultimately comes down to the return on investment, so you'd better compare the payback period of the two products. Micro-anti-manufacturers will make a fuss in two aspects, 1. High power generation-don't listen to what he says, let him speak with data, and it is best to have a project case. How high can the power generation efficiency be? 2, long service life, not easy to break, low maintenance cost in the later period-just ask him how many years is the warranty, can he guarantee 25 years?
My suggestion is to choose brands, big manufacturers and manufacturers with long warranty period. Some small manufacturers have very low prices, and the warranty period is 1 year. After 1 year, the maintenance cost is high. At present, the price war in the market leads to the decline of frequency conversion price year by year, and the profit is meager. Many manufacturers make money by post maintenance. The purpose of installing photovoltaic power generation on the roof is to make money, so you should not only calculate the initial investment cost, but also consider the future maintenance cost.