Comparison between 5 Star and 3 Star Energy Electrical appliances.

By Vinay Prakash on: 30-04-2017

Energy Star (trademarked ENERGY STAR) is an international standard for energy efficient consumer products. Electrical Appliances carrying the Energy Star service mark, such as computer products and peripherals, Ceiling Fan, kitchen appliances Air Conditioner, Inverter Ac, Colour Television, Direct Cool Refrigerator, General Purpose Industrial Motor, Submersible Pump Set, LED Lamps and other products generally use 20-30% less energy. In India Energy Star Rating program done by Bureau of Energy Efficiency.

It is the average amount of electricity used by the equipment in a year i.e. kWh/year under standard test conditions.

The Objectives of Standards & Labelling Energy Star Program is to provide information to consumer about the energy saving and there by the cost saving potential of electrical appliances. Means that more (5 Star) rated Energy Star electrical appliances consume less Energy and save more Money and Reduce greenhouse gas emissions and other pollutants caused by the inefficient use of energy.

To compare Electricity consumption between 5 Star rated and 3 Star Rated electrical appliances, example of two Air Conditioners has been taken as per following details

Appliances Specifications 1.0T Voltas SAC 125 MY1.0T Voltas SAC 123 PYa-R
Capacity (Ton) 1.0T 1.0T
Star Rating ***** ***
Rated Power Consumption (W) 1011 1141

Calculation of Yearly Energy Consumption

Energy Consumption Formulae

Yearly Electricity consumption (kWh or Unit) = Running Hour(s) per Day x Rated Power Consumption Rate (kW) x No of Running Days in a Year

Following table provides calculation of Electricity Consumption Details using above formulae.

Consumption Details1.0T Voltas SAC 125 MY1.0T Voltas SAC 123 PYa-R
Yearly Consumption (Formula With values) 10 Hrs x 1.011 kW x 300 days 10 Hrs x 1.141 kW x 300 days
Yearly Consumption (kWh or Unit) 3033 3423
Electricity Charges (@ Rs 5/per Unit) 15,165 17,115

As per above example it is clear that 5 Star rated AC is consuming 390 Units (kWh) less than 3 Star Rated AC.

The Calculations are based on following assumptions.

  • Running Hours per day: 10 Hours/Day
  • Running Days per Year: 300 days/Day
  • Rate of Electricity Charges: Rs 5 /Unit

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