How to Calculate Your Energy Consumption: A Simple Guide

The cost of electricity in Nigeria is at an all-time high especially if you belong to Band A. Managing your electricity bills and making informed decisions about energy usage can save you some money. If you’re considering a switch to solar power, knowing your energy needs can help you choose the right solar inverter system. While the topic might seem complex, calculating your energy consumption is simple. Let’s walk through the process step by step, without technical jargon.


Why Knowing Your Energy Consumption Matters

Before diving into the calculations, let’s talk about why it’s important to know how much energy you use. When you understand your energy consumption, you can:

  • Save Money: Identify areas where you can reduce electricity usage and your bills.

  • Choose the Right Solar System: Determine the size of the solar inverter and panels you need.

  • Be More Energy Efficient: Make informed decisions about appliances and their usage to conserve energy.


To calculate your energy consumption, you’ll need the following:

  • A list of your electrical appliances: Include everything you use daily, such as your refrigerator, TV, lights, and air conditioner.

  • The wattage of each appliance: This is usually listed on a label somewhere on the appliance or in the user manual. If you can’t find it, you can look it up online.

  • The number of hours each appliance is used daily: Estimate how long you use each appliance daily

Step-by-Step Guide to Calculate Energy Consumption

Step 1: List Your Appliances

Make a comprehensive list of all the electrical appliances you use in your home. This includes big items like refrigerators, and air conditioners, as well as smaller ones like lamps and phone chargers.


Step 2: Find the Wattage

Next, find out the wattage of each appliance. The wattage tells you how much electricity an appliance uses when it’s running. You can usually find this information on the appliance itself or in the user manual. If it’s not listed, you can search online by entering the appliance’s brand and model number followed by the word “wattage.”


Step 3: Estimate Usage Time

For each appliance, estimate how many hours per day you use it. Be realistic with your estimates to get an accurate calculation. For instance, you might use your refrigerator all day, but only watch TV for two hours in the evening.


Step 4: Calculate Daily Consumption

Now, calculate the daily energy consumption for each appliance. Use the formula:


Daily Energy Consumption (Wh) = Wattage (W) × Hours Used Per Day


For example, if you have a 100-watt light bulb that you use for 5 hours a day, the calculation would be: 


100W × 5 hours = 500 watt-hours (Wh)


Step 5: Calculate Monthly Consumption

To find out the monthly consumption, multiply the daily consumption by the number of days in a month:


Monthly Energy Consumption (Wh) = Daily Energy Consumption (Wh) × 30


Using the light bulb example:


500Wh × 30 = 15,000Wh or 15kWh


(Note: 1,000 watt-hours (Wh) = 1 kilowatt-hour (kWh))


Step 6: Total Energy Consumption

Repeat steps 4 and 5 for each appliance on your list. Then, add up all the monthly energy consumption to get your total energy consumption for that month.


Example Calculation

Let’s put this into practice with a simple example. Imagine you have the following appliances:


  • Refrigerator: 150 watts, used 24 hours a day

  • TV: 100 watts, used 4 hours a day

  • Laptop: 50 watts, used 6 hours a day

  • Light Bulb: 60 watts, used 5 hours a day

Daily Consumption:

  1. Refrigerator: 150 W × 24 hours = 3,600 Wh

  2. TV: 100 W × 4 hours = 400 Wh

  3. Laptop: 50 W × 6 hours = 300 Wh

  4. Light Bulb: 60 W × 5 hours = 300 Wh


Monthly Consumption:

  1. Refrigerator: 3,600 Wh × 30 = 108,000 Wh or 108 kWh

  2. TV: 400 Wh × 30 = 12,000 Wh or 12 kWh

  3. Laptop: 300 Wh×30 = 9,000 Wh or 9 kWh

  4. Light Bulb: 300 Wh × 30 = 9,000 Wh or 9 kWh

Total Monthly Consumption:

108 kWh + 12 kWh + 9 kWh + 9 kWh=138 kWh

So, your total energy consumption for the month is 138 kWh.

Tips for Reducing Energy Consumption

Once you know your energy consumption, you can start looking for ways to reduce it. Here are a few tips:


  • Switch to Energy-Efficient Appliances: Look for appliances with high energy efficiency ratings.

  • Unplug When Not in Use: Many appliances consume power even when turned off. Unplugging them can save energy.

  • Use LED Bulbs: LED bulbs consume less power and last longer than traditional bulbs.

  • Optimize Usage: Use appliances like washing machines and dishwashers only with full loads to maximize efficiency.

  • Regular Maintenance: Keep your appliances in good working order to ensure they run efficiently.


Calculating your energy consumption doesn’t have to be complicated. By following the steps outlined above, you can easily determine how much energy you use each month. This knowledge can help you save money, make informed decisions about energy usage, and even help you transition to solar power effectively. Remember, small changes in your energy habits can lead to significant savings and a more sustainable lifestyle.

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© 2023 Uwana Energy. Copyright and rights reserved