As my electric bill escalates, I often wonder, should I be concerned with the daily expense of leaving things run, or should I turn everything off when finished with a BB session? I have a $28.00 tester from Menards that answered several questions concerning every day expenses. First, using a single source 120 vac. outlet, I have my usual suspects up and running. Two QSC K12 powered speakers, one ALLEN&HEATH ZED 10fx mixer, an Ampeg GVT15H, AMPEG V4BH, DigiTech Vocalist Live4, HP Windows7 CORE i7 lap top, and a Yamaha MD4s. @ a rate of 9 cents per KW: 7hrs and 20 min.=1.63 KWH =.14 cents. :)So, I say let her run and enjoy the Best Buy available any where. Also for what is 's worth: a 12 gallon per day humidifier 58 hrs. and 45 min. cost .27 cents, An Eden Pure GEN4 heater, outside temp.@ 20 degrees fare., 98.18 hrs. cost $7.39. I hope someone can put these figures to good use.-----Leon