Two years ago I bought a PennState 1.5hp single bag DC. It has been a real disapppointment. It is okay right after I clean the bag out, but as soon as I use it the air flow goes down quickly. I got it because I am real short on space. Well, my wife insists I increase my shop 50% (not quite as good as it sounds, since half of that extra area will be used to store stuff that is now in the rec room; but still good) so I will have room for something better. It has a 16a motor, but a small diameter fan unit.
I could add one of those garbage can separators to keep it unclogged a big longer, but I suspect the loss power will be more than what I gain. I could replace the bag with a filter, with a can at the bottom (along with the garbage can separator) but that is expensive. Should I try to rehab it, or just ebay it and buy a real DC?
Speaking of which, I never use more than one machine at a time. Is a 1.5hp filter unit adequate, or do I have to go up to a 2hp? I see the cyclones are getting more popular. For one machine at a time, and not real heavy use, are they overkill? They seem to move less air than the single stage unit for the same motor size; is that right? Their virtue is ease of cleaning?