The most often I let it from a few days to one week to measure the consumption of one system, or a set of systems. My kill-a-watt (which is from another brand) has the function to extrapolate for a week, a month and a year. I generally note the year forecast.
This is what I did before buying a new fridge. The old one was a 650kWh/year. When choosing the new one we could choose between 100 and 150kWh/year. If 150 is 50% more than 100, it's always 77% less than 650. We chose a 140kWh/year as it fitted our needs.
Less often I measure the instantaneous consumption. To forecast I use the rules : 1W = 1€/year = 10kWh/year.
Denis.
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Earth absorbs 1.8 t CO2/head/yr, while a French generates 6.2 t CO2/yr To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.- kg saved 06/08-08/09: 1816.9+382.9 (ecodriving / 1420mi not driven) = 2199.8
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(2.66 kg/l diesel)
- kg saved by 3kWc photo-voltaic solar panels : 187 kg/yr
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(59.1 g/kWh)
Radioactive wastes saved by 3kWc photo-voltaic solar panels : - Long life (>100,000 years) : 2.85 g/yr (0.9 mg/kWh)
- Short life (<300 years) : 31.7 g/yr (10.0 mg/kWh)
Based upon "official" French figures...
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