Small computer system interface (SCSI) is an independent processor standard for system level interfaces between computers and intelligent devices (hard disks, floppy drives, optical drives, printers, scanners, etc.). SCSI is an intelligent universal interface standard.
In addition to SCSI, IDE is also a very common interface. From the point of view of ease of use, IDE is more suitable for ordinary users. In addition, personal computer users not only need to configure a few peripherals, but also do not require high speed. Therefore, it is more appropriate to choose IDE interface. In addition, IDE also has the characteristics of high performance price ratio and wide application. Although the SCSI interface has many incomparable characteristics, the price of the interface and its peripherals is too expensive to be borne by ordinary users, which determines the limitation of its actual use range. SCSI Solder Type Section ShenZhen Antenk Electronics Co,Ltd , https://www.antenk.com
In 2010, the global installed capacity was only 17.9 GW, and the extra PV inverters had to be used elsewhere, which resulted in the installation of the first two quarters of 2011. If it is assumed that the installed capacity of the entire industry in the year 2011 is still around 26 GW, and that year's shipments are still maintained at 26 GW, how much will this additional capacity go? The factory value of the 3 GW inventory is about 780 million U.S. dollars or so. , And such a large amount of capital in the stockpile will inevitably bring serious consequences.
SMA, one of the industry’s leading companies, confirmed this view in its press release published on January 13, 2012, and its “2011 solar inverter market scale reached 23 GW (2010), which was announced on February 1, 2012. :23GW), strong installation of emptied backlog inventory in the fourth quarter.
SMA further pointed out that according to the amount of its sales reserve project, the installation volume in the fourth quarter of the German market has been completed with the addition of inverters.
Other data also confirmed the expected shipment of 23.4 GW of photovoltaic inverter from IHS, and this data was independently derived.
It is too early to say that the shipment of 26GW is higher than the actual before the final record is announced. However, the current strong installation trend in the fourth quarter makes the industry generally think that 2011 is a record for photovoltaic inverters. year. We believe that in 2011, photovoltaic inverters have achieved good results in terms of supply and demand balance.
1. The working mode of IDE requires the whole process participation of CPU. When the CPU reads and writes data, it can't perform other operations. In this case, in the multitask operating system of Windows 95 / NT, the system reaction will be greatly slowed down. The SCSI interface controls the data reading and writing operation completely through the independent high-speed SCSI card, so the CPU does not have to waste time to wait, which obviously can improve the overall performance of the system. However, IDE interface has also made great improvements to improve this problem. DMA mode can be used instead of PIO mode to read and write data. DMA channel is responsible for data exchange, which greatly reduces the CPU consumption. However, comparing the CPU utilization of SCSI and IDE, we can find that SCSI still has considerable advantages.
2. The scalability of SCSI is larger than that of IDE. Generally, each ide system can have two IDE channels, with a total of four IDE devices. The SCSI interface can connect 7-15 devices, much more than IDE, and the cable connected is far longer than ide.
3. Although the price of SCSI device is higher, compared with IDE, the performance of SCSI is more stable, durable and reliable.
2011 Photovoltaic Inverter Shipment Riddle
The photovoltaic inverter industry in 2011 had a lot of achievements in limiting production capacity and eliminating excess inventory. Following the overcapacity of over 3GW in the world in 2010, the photovoltaic inverter industry successfully completed the 2011 market installation requirements in 2011 by using the above inventory and adding new shipments. Shipments in 2011 were based on better than the previous year's demand-matching capacity rate, and in late 2010, constraints on capacity stimulated over-ordering and excess capacity.