nasty. I guess it's a case of buy cheap buy twice.
If you know electronics, it may be worth taking it apart, and seeing what went wrong.
If it's a cooling, fan, then a 12v pc fan may just be as good for a drop in replacement.
However, if you've run it without a fan, it's likely something has melted.
Open it up (with out the power connected) and take some photo's, i'll do a post mortem for you, before you commit to the sea for burial. (please recycle it).
also, check you mains input, I always use surge protectors with anything more than a lightbulb. maybe a AC spike blew it up?
But , again, you can't expect something cheap, to last be as well built as something expensive. I suppose victron charges are 5 times the price for a reason (they also contain gold bars).
Buy cheap , and you buy twice.
if you are poor, you buy twice
if you are rich, you buy once, and save money long term.
This one of the ways the rich get richer, and the poor get poorer.
Show me a company that does this type of stuff with a lifetime warranty.
I hope you can post some burnt out circuit board photo's soon!