hi pierce
a belated welcome to the forums
I would suggest the lack of responses is probably partly due to the lack of information from you about the unit.
is it 12V in 240V out ? or some other voltage ??
is it the output fuse or the input fuse thats blowing ?
have you taken the cover off ?
are there any obviously blown components?
you havent told us what model of inverter just a brand name
have you done any google searching on the make and model to see if there is any service info available ?
in short, help us to help you
cheers
Dave