Real cost for SWG use

[KurtV]

Pat,
Thanks for the info. One minor quibble; the average residential electricty cost in the U.S. in 2003 was 8+ cents per kilowatt hour.

http://www.eia.doe.gov/cneaf/electri.../table5_3.html

[Brock]

Yup, actually I would bet it is closer to $.10 now. On the other hand did you actually take a reading off the power supply for the unit or was that just what it was rated for? 24w does seem reasonable for what it is doing though.

At 8.76 kw per month at $.10 is still $.876 a month so you have the cost correct, maybe slipped a decimal?

[PatL34]

I went and did a further measurement to check my original figures, and did in fact read my amp meter incorrectly.

The electric cost should be 1 X 240 = 240 watts x 12 hours daily running time = 2880 watthours X 365/12/1000 = 8.760Kwh X $0.1/Kwh = $8.76

Total cost = 8.76 + 4.6 + 7.5 = $20.86

This seems to compare with what I calculated previously 2 years ago.

Sorry about the error.

Pat