The main function of the PWM Solar Controller is to manage the charging and discharging process between solar panels and batteries in solar power generation systems. It is a traditional charge controller that controls the charging voltage and current through pulse width modulation technology to maintain the charging state of the battery and protect the battery. solar panel pwm controller, 12v pwm solar charge controller, pwm solar charge controller, best pwm solar charge controller, pwm solar charge controller for lithium Ningbo Autrends International Trade Co., Ltd. , https://www.aitsolarpanels.com
The essential! Build Android BT machine Note three points 1. The phone must support OTG
Before setting up, we still have some preparatory work to do. First of all, there is a hard requirement that the mobile phone must support OTG function (On-The-Go's abbreviation, can include storage, games and other peripherals into the smart phone and tablet For its use), after all, using a mobile phone as a storage device, its capacity is too small, and we need to obtain more storage space from the USB interface. Then we need to upgrade the system of the mobile phone to Android 4.0 or higher. If it is a tablet computer, any system that uses Android 3.0 or Android 4.0 can be used, so that we can use OTG to link flash memory or other removable storage devices. Identifies it.
2. Use a mobile hard disk to save the file again is to choose our storage, and I do not want to use the phone as a storage device for two reasons, one is the mobile phone itself is not large capacity, but also can not help but to buy a large capacity TF specifically for the next BT Card, I like to use existing equipment to complete some new applications, so using OTG to connect flash drives and removable hard drives is a more practical approach. And I prefer to use mobile hard drives because of the large amount of storage. Of course, there will be a problem here, because the current mobile hard disk power consumption is relatively large, OTG alone can not let it run, so we need to find ways to power the mobile hard disk. ;
The most convenient method is to use a two-head USB cable that connects the removable hard disk. This kind of line generally has a USB interface responsible for power supply and data transmission, and another USB interface is only responsible for supplying power. Connect the USB port that is responsible for data transmission to the OTG cable, and connect the USB port that is only responsible for the power supply to a device that can supply power, such as a computer, a battery charger with a USB port, or even a mobile power supply, so that your mobile hard disk can operate normally. Now.
3. Can change the path of BT download APP
In the end, what we need is a powerful BT download app. After I tested several mature BT download apps, I chose to use tTorrent Pro as a demonstration because it has one of the biggest features is that it can change the download path. Under normal circumstances, as long as the phone or tablet download files will be stored in a folder under the sdcard directory, and if you need to choose to use flash memory or removable hard disk to store files, their access path is in the root directory In the mnt folder, if the BT download APP does not support changing the download path, it cannot be automatically downloaded to our mobile hard disk, so tTorrent Pro can change the settings of the download path to meet my requirements. . 
Most mobile devices equipped with Android 3.0 or Android 4.0 can recognize flash memory and mobile hard disk (of course, this device must support OTG), a special condition is that these mobile devices have better support for FAT32 format storage devices. , But the FAT32 format does not support 4.3GB large files, so most of the flash and mobile hard drives are actually NTFS format, so how to make devices that do not support NTFS format can correctly identify the need for flash or removable hard disk A little trick.
Extended reading:
How to identify NTFS-attached mobile storage connected via OTG If this mobile device does not correctly recognize the NTFS-formatted mobile device, you need to wire this device to ROOT and install an app named Drive Mount. After the installation is complete, connect the NTFS format mobile hard disk to the mobile device through the OTG cable, start the Drive Mount, find the removable hard disk under the Unmounted Drives interface, select it, click the pull-down menu in the upper right corner, and click “Mountâ€, then Mounted Drives interface can see the files inside the mobile hard disk.
Let's open the RE Manager again. You can also see the path of the removable hard disk in the mnt folder. By this step, our mobile phone or tablet can already recognize the NTFS removable hard disk.
2. Change the download path to mobile hard disk 1
Next we need to change the download path of tTorrent Pro to the mobile hard disk. Open tTorrent Pro, click the down menu in the upper right corner, select "Settings" to enter the settings interface. In the Misc.settings section, find the "Directories" option. Click to enter. Click "Set save directory". This will pop up a window to set the download path.
Click on the top of the path bar, the path back to the root directory, enter the mnt folder, find the folder that represents the mobile hard drive, click to enter to choose your favorite download path. If you can't access the contents of the mobile hard disk here, you can also find the Storages folder in the sdcard folder. Click inside to enter the USB folder, and you will see the related files on your mobile hard disk that you have access to OTG. . If you want to create a new folder to specifically store the files downloaded by the mobile phone BT, you can click on the "new folder" in the appropriate path, enter the desired file name, and the new folder will be created. 
3. The easiest way to obtain BT seeds is to use the Torrent Pro's own seed searcher to crawl BT seeds. In fact, the function of this searcher is very powerful. tTorrent Pro contains 13 BT seed search engines. You can find the "Search engine" in the "Torrent settings" setting to replace it. Because each search engine searches for different number of seeds and health, it is recommended that when searching seeds, several search engines can be used to obtain better download speeds. The search method is also very simple. Click the magnifying glass icon in the software interface and enter the content you want to search. 
It should be noted that although this software supports Chinese search, I can't find related BT seeds when I enter Chinese tests many times, so I suggest searching in English. Of course, this also means that you can search for many sources that cannot be found in the country.
After you enter relevant content in English, relevant seeds will be displayed in the form of a list with the size of the displayed file and the number of Seeders and Leechers below, as well as the time the seeds were added. The greater the number of Seeders and Leechers, the higher the activity and the faster the download speed. 3
If you want to get the seeds of domestic film sources, you can choose to use a mobile phone browser to visit the web page directly, you can also download the BT seeds through your computer and then put it into your mobile phone or mobile hard disk. Then click the folder icon on the right side of the magnifying glass, find the BT seed file in its path, and click “Download†to download it. It is also very convenient.
download! Speed ​​up to 300KB/s, but unstable single task download speed breaks 300KB/s
After selecting the BT seeds, we can start downloading. In practical tests, tTorrent Pro can connect up to 250 users. In actual tests, the maximum speed has reached 300KB/s, and it is still relatively satisfactory from the speed point of view. But there is a more obvious problem, the download speed is not stable. H: u8 t( )% m( V
Since the maximum number of connections for a single task is only 250, after downloading the main link is broken, it is difficult to re-supply enough downloads in a short period of time, so the entire download speed is very large, and the minimum download speed is even When it's less than 30KB/s, I don't recommend using the mobile phone BT to download the files you need to use right away.
Multi-file download up to the limit of broadband.
After testing the single task download, test the multi-task download speed again. In the case of downloading 5 tasks at the same time, the BT download speed reaches the limit of the bandwidth, but the unstable download speed appears again.
Throughout the testing process, the download speed of the five tasks has been periodically fluctuating, so the download speed is still relatively poor in terms of the PC. This point on the PC compared to multi-channel download software - Thunder, pure BT download software limitations will be great, because there is no more way to add, rely on BT download to see the health of the seed, so in speed, for the time being Also can not keep up with the download speed of PC download or NAS download software. 
Experience! Low power consumption of Android BT downloader After testing, we discovered the feasibility of using an old mobile phone or tablet computer as a BT downloader. At the same time, we also found many interesting features. Of course, this has seen some current deficiencies. Let us now give a detailed description.
Advantage:
Very low power consumption The power consumption of BT downloads using mobile phones is very low. After stress testing, when hanging up 5 tasks for BT download and without using external power supply, the mobile phone can fully support 15 batteries with its own battery. Hours or more. Even if it is an ultra-low-power NAS, in the same situation, the power consumption per hour is at least 25W, so to calculate, use the old mobile phone or tablet PC to do the most power-saving program for BT download.
Occupancy is very small There is a very obvious phenomenon in the test is, use BT download to the requirement of the mobile phone is not high, when choosing a mobile phone of STMicroelectronics U8500 processor to test, its maximum processor occupation is only At 46%, this occupancy is not even as high as some social software. So even if it is a single-core mobile phone, as long as it meets the requirements mentioned earlier, it can also be used as a BT download.
BT download perpetual motion We mentioned how to supply power to the mobile hard disk. In fact, after doing so, the mobile phone is also in the charging state. That is to say, after connecting with the mobile hard disk, the mobile phone can also be in the state of not downloading and continuing to download. Think of it as a BT download "perpetual motion". And in the event of a power outage, the mobile phone can also be transferred from the wireless network into the 3G signal to continue downloading, of course, the cost is great.
Easy to place;
How big is a mobile phone with a mobile hard disk? Whichever wireless network can be plugged in can be BT-downloaded, this convenience is not comparable to other BT devices, if I can find a better way to share, then the low-end NAS does not seem to have A few years lived.
insufficient;
Unstable download speeds Obviously this is currently the biggest obstacle to mobile BT downloads, so using a mobile phone to download is not suitable for downloading files you desperately need. The unstable download speed also makes the energy efficiency ratio lower. Of course, if this number is compared with other BT download methods, it is still too high.
The feature set is not perfect. In the final analysis, the download software for mobile phones is only just starting. Most of the software only provides downloading functions and does not provide more setting options. tTorrent Pro is the most powerful BT download app I can find, but Relative to PC's BT software, it is still too young.
The domestic software has not exerted force on the PC commonly used several comprehensive download software such as Thunder, QQ cyclone did not exert force, or not yet involved in the mobile field, or is it just just starting, not many features, after all, the use of foreign APP There are still many limitations. But think of the powerful features of home-made download software, I still look forward to them in the mobile field to flex its muscles.
Suggestion: The longest BT download is the most power-saving option. Taking into account the current use of mobile phones as a BT download tool, the utility model has the characteristics of low power consumption, unplugged and downloadable, and determines that it is the longest time-saving download tool for power saving. If you have a large part of the file capacity and need to download it for a long time, it may be a good decision to use a mobile phone to do BT download. Although the speed is not good for PC, compared to PC or NAS, the power consumption of the mobile phone can be almost used as Zero power consumption.
Editor's opinion:
@ Computer reported Xue Hao: Perhaps this is the reason why mobile devices change the PC!
With the expansion of mobile device capabilities, we can do more things on the mobile device that were previously only possible with PCs. Although it can be seen that the current mobile end of the civilian data download research is still in its infancy, but it is foreseeable that under the temptation of ultra-low power consumption, a considerable number of users will choose to use the mobile phone as a BT download machine. use. This is only one aspect. The diversification of functions of mobile devices is inevitable. More omnivorous products will naturally be handed over to low-performance and low-power platforms such as mobile phones or tablet PCs, and PCs will be used as a high-performance computing center. The role will be more and more obvious, so the future of PC sharing will also change accordingly.
Main effect:
Charging control: PWM Solar Controller controls the charging voltage and current through pulse width modulation technology to ensure that the battery is charged at an appropriate voltage and current to prolong the service life of the battery.
Overcharge protection: The PWM Solar Controller can monitor the charging status of the battery, and when the battery is fully charged, it will automatically stop charging to avoid battery damage caused by overcharging.
Over-discharge protection: PWM Solar Controller can monitor the discharge state of the battery. When the battery power is lower than a certain level, it will automatically stop discharging to avoid battery damage caused by over-discharge.
Differences from other charge controllers:
Modulation technology: PWM Solar Controller uses pulse width modulation technology to control the charging and discharging voltage and current to maintain the charging state of the battery. In contrast, MPPT Solar Controller uses maximum power point tracking technology to adjust the output voltage and current of solar panels in real-time to achieve maximum power output.
Energy conversion efficiency: Compared with the MPPT Solar Controller, the energy conversion efficiency of the PWM Solar Controller is lower. Because the pulse width modulation technology cannot adjust the operating point of the Solar Panel in real-time, the output power of the solar panel may not be maximized.
Application Scenario: PWM Solar Controller is a traditional charge controller suitable for small-scale, low-power solar power generation systems. The MPPT Solar Controller is suitable for larger-scale, high-power solar power generation systems to improve energy utilization efficiency.
Overall, the main role of the PWM Solar Controller is to manage the charging and discharging process in the solar power generation system and protect the battery from damage. Compared with MPPT Solar Controller, it uses traditional pulse width modulation technology, and the energy conversion efficiency is lower. Suitable for small-scale, low-power solar power generation systems. The MPPT Solar Controller uses maximum power point tracking technology, which can improve the energy utilization efficiency of solar panels, and is suitable for larger-scale, high-power solar power generation systems.
tTorrent Pro main interface
ready! Pre-setting to do a good job 1. System support NTFS format is critical - Find the storage device connected with OTG in the save path. You can create a new folder to save the contents of our BT download.
Trying more search engines will find better seeds
The maximum speed of a single file can reach 350KB/s, but the speed is not stable. This is also different from the device.
Multi-task download, download speed reached the limit of the measured broadband