Sunday, November 05, 2006

Standby power usage

I used 22kwh of electricity yesterday. My various appliances (2 TVs, DVD, computer, phone, printer, broadband, mobile charger) use a total of 50 watts on standby. So if I left them all on standby for an average of 20 hours per day, they'd consume 365kwh in a year, 4.5% of my electricity usage, costing me £30 a year. So I don't.

That's the trouble with the evidence for this being a problem - it's extremely scarce. Even that linked from the title to this item just surveys the wattage - they didn't monitor actual usage. Nor did they allow for the saving in heating costs in winter. I doubt that there's much of a real saving there. Also it's a real fuss to have to pay attention to - on a par with saving bits of string - and needs a wartime mentality.

More sense perhaps in looking at enegy saving lightbulbs? A 100w lamp used for 4 hours a day consumes 146kw in a year, costing £12. If I can save 75% of that for a cost of £3.50 ... and then the bulbs last another 8 years ... even if the heat is useful for 6 months of a year, it's a clear winner.

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