https://blog.wongcw.com/2021/07/09/bluetti%e6%8e%a8%e5%87%baac300%e8%88%87ac200-max%e6%a8%a1%e5%a1%8a%e5%8c%96%e4%be%bf%e6%94%9c%e5%bc%8f%e7%a7%bb%e5%8b%95%e5%85%85%e9%9b%bb%e7%ab%99/