New trends in inverter development: ＂High power becomes smaller, small power becomes larger＂
With the increasing investment experience of domestic power station owners, the balance between the first investment, operation and maintenance investment and power generation revenue has become more and more important in equipment selection, which also drives the inverter to “high power and small”. The new trend of small power has become larger.
“High power is getting smaller”, mainly refers to the continuous improvement of the power density of centralized inverters (the power is not reduced in size). This trend was initiated by Sunshine Power, Maoshuo Electric, TBEA and other companies, and achieved a good Effect.
"The size reduction of high-power inverters" sounds simple, but it is not easy to do it. It is necessary to redefine the original organic topology scheme, and also consider dust and heat dissipation. However, once the volume reduction is achieved, it provides great convenience for later applications.
In today's fierce competition, if anyone dares to say that their 500KW inverter cost is 0.2 yuan per watt, it is enough for all PV people to look at it, not to sigh that they are costly, but to worry about how they live on such a cost. Going on? Therefore, "the size reduction of high-power inverters" first focuses on cost reduction. Through the adjustment of the topology and heat dissipation technology, the centralized inverter not only has a small volume, but also the cost has been greatly reduced, and the market competitiveness has also increased.
In addition, the large-power inverter can reduce the transportation and transportation costs and reduce the operation and maintenance convenience. In the simplest example, the traditional centralized inverter opens the door before and after, not only the front and rear door opening space is reserved during installation, but also causes a lot of trouble for the operation and maintenance engineer; the centralized inverter with the reduced size realizes single-sided opening, It can be installed against the wall and single-sided maintenance, which greatly improves the installation and maintenance convenience.
"Low power becomes larger", mainly refers to the continuous increase of stand-alone power of string inverters. To put it simply, 20KW inverters were the most widely used in industrial and commercial roof projects two years ago, and now 30-40KW has become the mainstream. Recently, 50KW inverters such as Maoshuo Electric have also emerged in the market.
The power of the string inverter is increased from 20KW to 50KW. The biggest advantage is that the number of parallel systems in the whole system is reduced, thereby greatly reducing the influence of grid-connected harmonics on the power grid. At the same time, the single-machine conversion efficiency is greatly improved after the power is increased, which can effectively improve the overall power generation efficiency of the photovoltaic system.
It is worth mentioning that many people think that the increase of single-unit power of the inverter will reduce the overall MPPT number of the system and cause the system power generation efficiency to decrease. However, this doubt was quickly dispelled by the 50KW model released by Maoshuo Electric. The Moso Electric ST50KTL model is designed to be a 5-way MPPT. This not only does not reduce the overall MPPT of the system due to the increase of the inverter's single-machine power, but also facilitates the engineer's board and system design.
Another advantage that has to be mentioned about "small power becomes bigger" is that it saves a one-time investment in inverter equipment. In this way, the amount of power generation is increased, and the initial investment in the system is reduced. The positive and negative effects greatly increase the investment income of the owners.
The trend of “high power becomes smaller and small power becomes larger” is driven by the market demand of “high power station investment income”, and the specific results should also be tested by the actual operation of the power station. And we are also looking forward to more companies to stand up and launch more new products and technologies according to market demand.