You can see manual book here: https://www.altinelenerji.net/english-manual-book/4kw%2048v%20charge%20controller%20manual%20book.pdf
2 Year Warranty
You can see manual book here: https://www.altinelenerji.net/english-manual-book/4kw%2048v%20charge%20controller%20manual%20book.pdf