Don't forget to buy a second one, as IMHO, you'll need a spare on the shelf when things go sideways. 1-year warranty, all kinds of conditions upon the return/repair/exchange, seller rights above buyer rights, etc.
maximumsolar.online/termsandsupport/#warranty
If, like me, you bought one to "test the waters" wrt to AIO's, and are self-supporting ... no problem. Mine lives on a hand-truck "solar generator" project, while I run it through the mill of daily life & various power projects. I fully expect mine to die sometime near the 1-year mark, and will autopsy the thing to see what crapped out. At that time, I'll also find out how "self-repairable" these things are ...
I'm not expecting to have years of service from it, not at the price point at which I bought it ...
Good luck with your project!