Online rumors that China Mobile is preparing to use China Mobile's customized mobile phone with a huge subsidy of 100 billion yuan, was immediately denied by China Mobile, and pointed out that it is actively supported by multi-mode multi-frequency full-network standard terminals, but considering the reality The support of the entire Netcom terminal is actually unfavorable to China Mobile. Advantages of China Telecom and China Unicom China Telecom and China Unicom have both obtained TD-LTE and LTE-FDD licenses, but from the actual situation, the two are undoubtedly focusing on LTE-FDD. Compared with TD-LTE, LTE-FDD has advantages in single-base network coverage and high-speed mobile scenarios, among which China Telecom has the fastest network coverage. China Telecom currently has 860,000 4G base stations and has tendered 300,000 4G base stations, some of which will be built using the 800MHz band. It is estimated that the coverage of LTE-FDD base stations built with the 800MHz band may be equivalent to four 1.8GHz. TD-LTE base station coverage, which will help it quickly shorten the gap with China Mobile's 4G network coverage. China Mobile currently has 1.46 million TD-LTE base stations. The coverage of low-frequency 4G is obviously obvious, and it has a strong ability to circulate, even if it is difficult to cover the corners such as stair angles and ravine trenches, China Mobile currently uses 1.8GHz and 2. The 3GHz and 2.6GHz frequency bands are difficult to cover difficult areas such as the angle of the trench. Another advantage of China Telecom and China Unicom over China Mobile is that they have the strongest optical fiber transmission network. The 4G network needs strong optical transmission network support to obtain stable and fast download speed. Up to now, China Mobile's international export bandwidth is only China Telecom. A fraction of the size, less than half of China Unicom, more than half of China's IDC data centers are built on the China Telecom network. Under such circumstances, China Telecom's 4G network will catch up with China Mobile in terms of coverage, occupying the greatest advantage in network download speed stability, high-speed mobile scenes, and online experience, followed by China Unicom, and again mobile, in the 4G era. The data is king, which will cause China Mobile to be in an unfavorable competitive position. All Netcom is unfavorable to China Mobile In the 3G era, due to the slow download speed of China Telecom's CDMA and the high cost of its chips and patents, the price of mobile phones is relatively high. Generally speaking, the thousand-yuan smartphones launched at that time support CDMA more than the 3G mobile phones supporting Unicom and mobile. It costs about 100 yuan, and China Unicom's 3G network coverage is poor. Its 3G base station is about 400,000 in 2013 and China Mobile has over one million base stations. So China Mobile has survived 3G by covering excellent 2G networks. In the era, from 2009 to 2013, the number of net subscribers of China Mobile, China Telecom and China Unicom was 300 million, 158 million and 148 million. In the 4G era, China Mobile's current 4G network is still the best, but the network download and upload speed is lower than that of China Unicom. In theory, the upload and download speeds of LTE-FDD single carrier are 50Mpbs and 150Mbps respectively, TD- LTE single-carrier upload and download speeds are 50Mbps and 100Mbps. To shorten the gap, China Mobile requires terminal manufacturers to support LTE Cat7 technology, that is, both upload and download support dual-carrier technology to shorten the gap with Unicom Telecom. Today, China Telecom and China Unicom's network coverage shortens the gap with China Mobile. In particular, telecommunications may bring great competitive pressure to mobile in the case of coverage. However, since CDMA has not retired, it requires support for China. Telecom's 4G mobile phones need to support full Netcom, which leads to higher costs. If China Mobile's users generally have a full Netcom dual-card mobile phone, they may try to use Telecom or China Unicom's services while using China Mobile's services. In order to win the support of customers, China Telecom and China Unicom are now more favorable in terms of price than China Mobile. Guangzhou Unicom has introduced a daily rental card with a monthly fee of 6 yuan. The caller ID is 1 yuan per day to receive 500M traffic fee. China Mobile's 10 yuan 1G7 days is much cheaper and cheaper. China Telecom is also following the launch of preferential traffic tariffs, which puts great pressure on mobile. If users feel that China Unicom and Telecom are in difficult areas of coverage during use. Better coverage, plus wireless speed stability, Internet experience and other advantages will likely lead to the loss of Chinese mobile users. In fact, as China Mobile’s 4G subscribers increase sharply by 500 million, its wireless Internet speed has declined significantly in densely populated first-tier cities, which is forcing it to strengthen the construction of 4G base stations in first-tier cities to ensure, but due to densely populated cities. The base station is already quite crowded. Increasing the number of base stations inevitably leads to an increase in inter-base station interference, which also affects the Internet experience. Moreover, such an approach brings great difficulties to China Mobile's network optimization work. China Mobile certainly understands its weaknesses. At present, it is actively promoting the commercialization of VOLTE. It will transfer voice calls to 4G networks to free up the 900MHz frequency band used by 2G networks. It has the most frequency band in the 900MHz frequency band, even if it cannot wait for all. The migration of 2G users to 4G networks can also free up some 5Gs with 4G or even the future. From the perspective of China Mobile's proposed 5G network test next year, I think it is more likely to use the 900MHz premium frequency band for 5G. So it is not difficult to understand why China Mobile is worried about pushing multi-mode multi-frequency full-network standard terminal, it is likely to marry China Unicom and China Telecom, considering that it has nearly 60% of China's mobile phone market share and the entire Netcom terminal. The higher cost factors, terminal companies are actually more willing to launch non-full Netcom products, which can be seen from the domestic mobile phone market is mostly non-Netcom mobile phones, so its short-term advantages can not be shaken, and then two years Time 5G will probably enter commercial use. It certainly hopes to return to global standards. This is also the driving force for its active promotion of the global 5G standard. Of course, the so-called global 5G unified standard is the European standard. Micro inverter is a small inverter used in solar power generation systems, its main function is to convert the direct current generated by a single Solar Panel into alternating current. Unlike traditional centralized inverters, microinverters are usually equipped with one per solar panel, that is, each solar panel has an independent microinverter. grid tie micro inverter, off grid solar micro inverter, hoymiles microinverter price, micro inverter solar system, solar system with micro inverters Ningbo Autrends International Trade Co., Ltd. , https://www.china-energystorage.com
Main effect:
1. Individual control: The microinverter provides independent conversion control for each solar panel, which means that each solar panel can optimize its power output individually. This maximizes the power generation efficiency of the solar panels since shading or other influences only affect the power generation efficiency of individual panels, not the entire array.
2. Reliability: Since each solar panel is equipped with a micro-inverter, even if one of the inverters fails, the other panels can still work normally, thereby improving the reliability of the entire system.
3. Flexible installation: Micro-inverters are usually small and can be installed near solar panels without being concentrated in one location, so installation is more flexible and convenient.
Differences from other inverters:
1. Individual control: Compared with traditional centralized inverters, microinverters provide independent conversion control for each solar panel, enabling each panel to reach its maximum power output.
2. Fault isolation: The micro-inverter has the function of fault isolation. Even if one of the inverters fails, other panels can continue to work without affecting the operation of the entire system.
3. Installation method: The micro-inverter can be flexibly installed near the solar panel, and does not need to be concentrated in one location, so the installation is more flexible and convenient.
4. Applicable scale: micro-inverters are usually used in small-scale solar power generation systems, while traditional centralized inverters are suitable for larger-scale photovoltaic power plants.
Overall, the main role of microinverters is to individually control and optimize the power generation efficiency of solar panels and improve the reliability of the system. Compared with traditional centralized inverters, it has some advantages in terms of flexibility, fault isolation and applicable scale.