So I spoke to Steve and Tim from Pacific Coast Imports and they had the following to say..
The fuses I'm blowing aren't factory fuses, so that may be the issue. They are sending me some of "their" fuses.
They also felt it could be a load problem, but the chiller is on it's own cicuit (15A) that previously powered 2 400W ballasts plus pumps. I can't see that being the issue.
Over heating; It seems that this unit blows when it gets too warm. However, it sits on top of an end table directly beside an open window with a 19" fan blowing across the room to circulate the air around the chiller. To increase the air circ around it, I'd have to hang it outside the window!!
Improper house grounding is another cause, they say. If my house isn't grounded properly, this could cause the problem.
I've run this thing for up to 7 days without a fuse blowing, and it seems the primary cause is heat (if the kids close the blinds or something, it blows). At this point I'm not sure where to go with this, as I'm certain that the fuses won't be the issue. The fuses I bought come from a reputable electronics supplier and I'm sure they are as good as any other fuse I can get from PCI. I'm not a fuse expert though...
Overall, I'm not as happy as I was at the beginning of this thread, although PCI did state they have sold over 4000 of thse exact units without issue. I can't find any online reference to match my own experiences, so either A) my unit is defective, or B) My house wiring is defective.
Any electricians have any thoughts or diagnostic ideas to try?