Hmm, lol.
I really dont know what to suggest or look for. Its possible the unit is being faulty as well? A standard 15 amp circuit should be able to handle, if I remember correctly, either 1650W or 1850W or something, so I presume you should be able to dangle almost that off the power bar because most DJ powerbars come with a 15A breaker? Mine (Chauvet units) do anyways.
Someone with more electrical knowledge will chime in im sure
Cheers,
Chris