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 Mar 18, 2015
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Ya lose very little with the rounding to 2 significant digits but more than close enough ... I wind up answering this question frequently so have a spreadsheet do it for me that just needs wattage, cost and efficiency. Im 24 cents per kw hr.For anyone else, here is a primer...
The efficiency is the PS conversion efficiency  to make 600W available for the PC, it takes from the electrical outlet 600/0.87=690W=0.69kW. So that's your full power bill, you don't pay just the losses in the PS. 0.69kWh per every hour of mining. 16.56kWh per every day. 5895 kWh per year. I am paying approx $0.1/kWh (10 cents), so that would be $589. Of course if your rig uses less than 600W, numbers scale down.
If anyone would like to have.
Gaming (Hours Per Week)
Wattage: 600
Efficiency: 87.00%
Hours/ Week: 168
Weeks / Year: 52.18
Hours / Year: 8,766.00
KwHrs / Year: 6,045.52
Cost of KwHr: $0.24
Cost per Year: $1,450.92
Mining (Hours Per Day)
Wattage: 600
Efficiency: 87.00%
Hours/ Day 24
Days / Year: 365.25
Hours / Year 8,766.00
KwHrs / Year 6,045.52
Cost of KwHr $0.24
Cost per Year $1,450.92
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