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    How to calculate my energy consumption

    Discover our solar power installation guide with expert advice for going solar:

    A guide to solar power systems - How to build a solar power system - How to calculate my energy consumption

     

     

    Annual energy consumption of typical household appliances

     

     Appliance

    Wattage

    Period of useFrequency of useAverage annual power consumption kWh (daily WHD) 
    Cold Fridge Freezer (250 litres)
    A+ energy rating
    150 - 200W 365 days Continuous 201 kWh*
    (550 WHD)
    Fridge Freezer (250 litres)
    C energy rating
    200 - 350W 365 days Continuous 500 kWh
    (1370 WHD)
    Air conditioning 2600 - 4000W 60 days 5 h/day 960 kWh
    (1600 WHD)
    Leisure CRT TV "On" 80 - 100W 335 days 4h/day 121 kWh
    (360 WHD)
    CRT TV "standby" 4 - 10W 365 days Continuous 59 kWh
    (160 WHD)
    LCD TV "On" 90 - 250W 335 days 4h/day 241 kWh
    (720 WHD)
    LCD TV "Standby" 3W 365 days Continuous 22 kWh
    (60 WHD)
    Plasma TV "On" 261 - 344W 335 days 4h/day 402 kWh
    (1200 WHD)
    Plasma TV "Standby" 3W 365 days Continuous 22 kWh
    (60 WHD)
    Computer (cathode screen) 100 - 120W 240 days 4h/day 106 kWh
    (440 WHD)
    Computer (cathode screen)
    "Standby"
    40 - 60W 365 days Continuous 400 kWh
    (1100 WHD)
    Flat screen computer 70 - 80W 240 days 4h/day 72 kWh
    (300 WHD)
    Flat screen computer "Standby" 3W 365 days Continuous 25 kWh
    (70 WHD)
    Washing/Drying Washing machine
    AAA (60°C cotton)
    2000 - 2200W 48 weeks 4 cycles/week 0.9kWh/cycle ->
    173 kWh**
    Washing machine
    C (60°C cotton)
    2500 - 3000W 48 weeks 4 cycles/week 1.35kWh/cycle ->
    259 kWh**
    Tumble dryer C 2500 - 3000W 32 weeks 2 times/week 3kWh/cycle ->
    192 kWh
    Iron 750 - 1100W 48 weeks 5h/week 260 kWh
    Sewing machine 70 - 100W 48 weeks 1h/week 4 kWh
    Housework Vacuum cleaner 650 - 800W 48 weeks 2h/week 70 kWh
    Bathroom Electric razor 8 - 12W 335 days 5min/day 0.3 kWh
    Hair dryer 300 - 600W 48 weeks 30min/day 11 kWh
    Lighting Lamp with energy saving light bulb 15 - 25W 335 days 5h/day 34 kWh
    (100 WHD)
    Incandescent light bulbs
    3 light bulbs 3h/day
    100 - 200W 335 days 3h/day 151 kWh
    (450 WHD)
    300W halogen lamp 300W 335 days 5h/day 503 kWh
    (1500 WHD)
    Aquarium 100 - 300W 365 days Continuous 876 kWh
    (2400 WHD)
    Kitchen Stove oven 8000 - 10000W 335 days 35min/day 928 kWh
    Classic oven 2000 - 2500W 48 weeks 1.5h/week 162 kWh
    Microwave oven 1000 - 1500W 48 weeks 1.5h/week 90 kWh
    Deep fat fryer 1500 - 2000W 48 weeks 1h/week 84 kWh
    Meat grill 1000W 48 weeks 10 min/week 8 kWh
    Coffee machine 500 - 1000W 335 days 10 min/day 42 kWh
    Waffle maker 800 - 1200W 15 days 1h/day 15 kWh
    Toaster 500 - 1000W 48 weeks 10 min/week 5 kWh
    Blender 100 - 150W 48 weeks 10 min/week 1 kWh
    Extractor hood 70 - 150W 335 days 40 min/day 25 kWh
    Dishwasher 1200W 48 weeks 5 times/week 288 kWh
    Hot water 100L water heater 2000 - 2500W 335 days 80L/day 1554 kWh**
    5L under sink water heater 2500W 335 days 10L/day 194 kWh
    Heating Hot water pump
    permanent
    40 - 60W 240 days Continuous 288 kWh
    Hot water pump
    (temporary)
    40 - 60W 240 days 6h/day 72 kWh
    Electric heater 1000 - 2000 W 240 days 30min/day 180 kWh
    Other Radio-alarm 3 - 6W 365 days Continuous 20 kWh
    (55 WHD)
    Electric lawn mower 1000 - 1500 W 32 weeks 1h/week 40 kWh
    (1250 WHD)

     

    • *For refrigerators, wattage may fluctuate throughout the day. The data provided in the table is taken from the technical specification of each appliance.
    • ** For washing machines, wattage can vary during the wash cycle. The data provided in the table is taken from the technical specification of each appliance.
    • ***The formula used to calculate hot water requirements is the following: Hot water required = 80L/day at 60°C. Heat output of water = 1.16 kWh/m3.°K. T° entrance = 10°C. Power consumption = 0.08 x 1.16 x 50 x 335 = 1554 kWh
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