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EnCalcE Formulae Latest Version: 4.4 Size: 459KB Released 14-April-2010

EnCalcE uses the following formulae to calculate the results:

Hours Used = Payback Period * 365 * (Normal Rate Hours On + Cheap Rate Hours On)

Standby Hours Used = Payback Period * 365 * (Normal Rate Standby Hours + Cheap Rate Standby Hours)

Number Of Replacement Items = Hours Used / Item Life (Rounded up to next whole number)

Inflation Multiplier A = (1 + Inflation / 100)^{Payback Period}

Inflation Multiplier B = (1 + Inflation/ 100) + (1 + Inflation/ 100)² + . . . . . . . . . . + (1 + Inflation/ 100)^{Payback Period}

Item On Cost per Day = ((Normal Rate Hours On * Normal Rate * (100 + VAT) / 100) + (Cheap Rate Hours On * Cheap Rate * (100 + VAT) / 100)) * ( Item Wattage / 1000) * Inflation Multiplier A

Item Standby Cost per Day = ((Normal Rate Standby Hours * Normal Rate * (100 + VAT) / 100) + (Cheap Rate Standby Hours * Cheap Rate * (100 + VAT) / 100)) * ( Item Standby Wattage / 1000 ) * Inflation Multiplier A

Item Cost per Day = Item On Cost per Day + Item Standby Cost per Day + Cost Of Item / (Payback Period) * 365)

Item Cost per Quarter = Item Cost per Day * 365 / 4

Item Cost Over Payback Period = ( Item On Cost per Day + Item Standby Cost per Day * 365 * Inflation Multiplier B / Inflation Multiplier A ) + Item On Cost per Day + Item Standby Cost per Day

Item Standby Percentage = Item Standby Cost per Day / (Item On Cost per Day + Item Standby Cost per Day)

Item CO2 Generated Over Payback Period = (((Normal Rate Hours On + Cheap Rate Hours On ) * Item Wattage / 1000 ) + ((Normal Rate Standby Hours + Cheap Rate Standby Hours ) * Item Standby Wattage / 1000 ) ) * CO2 Conversion Factor * 365 * Payback Period

Note 1: VAT is not applied to Item1 or Item 2 cost.
Note 2: If the currency selected is not UK Pounds (£) or Euros ( €) then VAT is changed to TAX.
Note 3: The CO2 generated does not take into account the CO2 generated in manufacturing and supplying an item.
Note 4: Number of replacement items assumes that standby time does not affect item life.
Note 5: Annual inflation is only added to the electricity costs not item costs.
Note 6: Annual inflation is added for each year of the payback period starting at the end of year 1 with no allowance for part years.
Note 7: If inflation is greater than zero and the payback period is at least one year all electricity use costs calculated reflect the coat at the end of the payback period except for the cost over the payback period which is a true cost including inflation.