One of my best friends is of the belief that running high power machines one after the other for the same interval each time, uses less electricity than running them at the same time for the same period of time.
I laughed and beg to differ, which started quite the argument.
Heres how this went.
He has a large room air conditioner and a pool pump. The pool pump draws about 15 amps, the room air conditioner draws almost exactly the same amount(based on the spec sticker) 14.5 amps. Close enough.
So his wife comes home and turns on both the pump and the A/C. No problem, they are on separate circuits. My buddy gets home and has a fit, saying that its costing more money to run them at the same time as opposed to 4 hours of the pump, and then another 4 hours of the A/C. his wife tells him hes insane(actually thats not what she said but this is a F.O.W. so I cannot repeat the actual words used).
Somewhere in all of this the comment"Go ask Jim!" was spewed.
To play neutral(no pun) for both phases(pun intended) I asked my buddy if he was referring to the peak/off peak times our power provider has, as thats the only way I could see this costing more. WE also have a tiered usage charge rate that is also confusing as hell but forget about that.
He responds that it has nothing to do with the charges, but the amount of power used.
He is adamant that running two 15amp loads(30amps total for both A/C and the pump) for 4 hours uses more electricity, than running one 15amp load for four hours(the A/C), shutting it off, then the other 15amp load(the pump) for another four hours. I explained that you are still using the same amount of power in both cases. When both are running you use 30amps continuously for four hours or 16Kw. When run one after the other, the AC unit will draw about 2Kw/hr for 4 hours or 8KW, and the pump will do the same giving you 16KW for the full 8 hours. My math may not be exact, but its close enough for explanation
My friend told me I have no idea what I am talking about and that he heard about this on the radio or something.....
I told him I agreed with his wife....he's nuts(I too used words that cannot be posted in a F.O.W.)
Just thought some may find this amusing.