Battery could be low (unbalanced batteries are not uncommon when newly shipped), or there could be something that's not connected (or not fully or correctly) in the system cabling.
I don't know the TSDZ2 system but there are some systems that if the battery is too *high* a voltage they shut off, too.
There is a long thread about the TSDZ2 that may also have other info for you, and several other troubleshooting threads, if they help:
https://endless-sphere.com/forums/search.php?keywords=TSDZ2&terms=all&author=&sc=1&sf=titleonly&sr=topics&sk=t&sd=d&st=0&ch=300&t=0&submit=Search