Warranty aside, here’s the main problem with using it in the US. (the OP is in Hawaii)
(from a review on Amazon)
When I talked to my local utility I was told that If it was not on the approved list at "[…]"
And it had to be UL 1741 to be used in the USA. If this unit was used in my system I would not be allowed to connect it to the utility. This is a grid-tie inverter, it does not work unless it is connected to the utility.
It would also void my fire insurance because it is not UL 1741 listed.
I really want this unit to be listed so I can use it.
I have emailed the manufacture and they tell me this is a very good unit but the cost of UL1741 is too munch unless I would buy 2000 unit then they would conciser UL listing.