The choice is a headache for many people. When faced with a wide range of choices and conditions, suddenly find that they do not know how to choose.
Not recently, he received a message from a friend from the countryside. He wanted to build a 5kW photovoltaic power system on the roof of his home, but when the inverter was selected, he was caught in the "choosing obsessive-compulsive disorder!"
He first compared the price in Taobao, the same brand price difference is a few hundred, and did not find the official flagship store; then consulted in the WeChat friends circle, several agents said that they are xx manufacturers directly to the goods belonging to a place The total generation, but there are several general generations in one place. Who should be elected? In desperation to contact several manufacturers, everyone said that they are better than each other, the advantages listed a lot, but in the end which is better? Finally found the largest brand inverter company, but the other party heard that as long as a 5kW, simply say you contact xx regional agents!
After some tossing, this friend is not at all interested in it. Why is it so difficult for rural people to choose an inverter?
In fact, there are still tips for the selection of inverters in photovoltaic systems. Can be considered from these aspects: cost, efficiency and operating characteristics.
First, costs often affect people’s choices
For rural users, the construction of photovoltaic systems is not fashionable, and the picture is fresh. Most of them are considered from the perspective of financial investment. System costs often influence people's choice space. This also provides business opportunities for individual businesses, in order to occupy the market to bring cheap inverters into the market. In fact, cheap is not bad, as long as the cheap is not built on the low quality like. However, in reality, cheap prices are often equated with low quality.
PV inverters for household systems are string inverters. They are compact and lightweight. They are very convenient to handle and install. They do not require professional equipment and tools, and they do not need a power distribution room. All of them are installed next to the PV modules. The cable should not be laid on a large scale and the installation cost is relatively low.
Its cost is not external, so where is it? Certainly in its interior, the inverter is composed of many components such as IGBTs, fuses, capacitors, sensors, relays, diodes, microprocessors, segments, resistors, and so on. Do not underestimate the difference between the components of different brands of these components. Still great. In addition, the inverter panel processing methods, the size of the display is also a big gap.
Second, the efficiency of the photovoltaic generation era of the king, inverter efficiency to look so!
At the time of writing this article, PV also consulted the mainstream inverter manufacturers in the industry. According to the propaganda above, the maximum efficiency of each individual can reach 98% or even higher. The high efficiency of the inverter is the basic guarantee for photovoltaic generation and user benefits. The differences in inverter efficiency of different brands are mainly related to system optimization and line losses. String inverters commonly used in user systems, each battery string is input to an inverter, and the inverter performs MPPT on the input battery strings individually to ensure that each string generates the maximum amount of power. Even if a string is broken due to solar radiation or broken due to a fault, other strings are not affected and normal power generation continues.
In practice, the only indicator to consider the efficiency of inverters is the amount of power generation. Companies that do EPCs compare the inverters of two different brands and often use the same board with a same power inverter. It is a method, but it is not absolutely accurate. Here we only say that the amount of power generated by the inverter screen can also be artificially manipulated, and the efficiency can also be controlled by software. The most accurate one is based on the meter. This is also the reason why users have doubts why the number on the inverter screen is different from the number displayed on the meter. Of course, this situation is not very common, but don't make a fuss when you encounter it. Therefore, when choosing a comparison, find a suitable efficiency comparison method.
Third, to master the inverter's operating characteristics, the life of its power generation is also an increase.
Above we mentioned that the inverter consists of so many components whose operating performance determines the performance of the inverter. The inverter in household system work generally has IP65 protection level, but it is not accidentally "invulnerable" and "non-toxic and non-invasive".
The process of inverter operation is an exothermic process. While the source is continuously generating electricity, a large amount of heat is generated. This requires sufficient convection space around the inverter to disperse the surrounding area. The heat, household system is usually based on natural heat dissipation, will not be equipped with fans, medium and large inverters are often equipped with cooling fans.
Although the inverter has IP65 protection level, but when you expose it to harsh environment for a long time, it will also affect its service life, affecting its power generation capacity. If you want the inverter to operate stably for 10 or 20 years, it is essential to its “loveâ€. Although you will not configure an inverter room on your home system, try not to expose it to the nakedness and nature. , Usually it will be equipped with a awning on the top.
Fourth, complete certification can be used as a selection criteria.
Regardless of whether the inverter is exported abroad or domestically, the country has strict standards for it. From the domestic perspective, the most authoritative is the CQC certification. For special requirements, the project must meet the leader's certification. .
In addition, the National Quality Inspection Center conducts sampling inspections of inverter manufacturers of different batches of domestic inverter manufacturers every year, and will announce the results. If even the national quality inspection department does not pass the random inspection, you can still claim that the inverter is reliable. Is it? This can also be used as a reference when choosing.
Here we will first talk about these. In general, photovoltaic inverters should be based on the actual installation of the user to select the inverter, not only can save engineering costs, simplify installation conditions, shorten the installation cycle, and can effectively improve the system power generation Efficiency is generally summed up as the principle of high efficiency, reliability, and low cost. These three are tightly integrated and one problem arises. For the entire system, there will be a phenomenon of “short legsâ€, and it is necessary to understand that “one point for one point and one point for one minute†"Hidden rules of the market".
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