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by MauranKilom
1517 days ago
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The math is right but the units are messy. Watts are already energy/time, which is correct for the 25 W figure, but the 219 should be kWh/year. 25 W * 24 h/day * 365 days/year = 219000 Wh/year = 219 kWh/year Which makes me notice that 1 kWh / year = 1000 Wh / year = 1000 Wh / (356 * 24h) = 0.117 W. So you can quickly estimate that a device with x Watts of constant consumption will have you paying for roughly 10 x kWh in electricity a year. With electricity costs on the order of 20 cents/kWh, that means a rule of thumb is "double the wattage, that's how many $ it'll cost you to have it running all year". |
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