A rough calc:
At 7 cents per kilowatt/hour, assuming that a PSU draws 320 Watts, comes out to 2.24 cents per hour.
6$ would cover ~267 hours, or 11 days, in a month.
If I recalculate with the proposed 3 * 80 W = 240 Watts (assuming a 100% efficient PSU), I get:
hourly cost: 1.68 cents
6$ coverage: 357 hours, or 14 days.
Maybe it's not so bad... I'll check my light bill, and comment.
|