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How to Calculate Electrical Load for Home Appliances?

Calculate Electrical Load of a House in India

Electrical load calculation is a smart way to determine the units of power used to run all things that consume electricity. For many reasons, understanding the electricity usage of different appliances, fixtures, and electronics in your home can be important. You may want to know the energy cost of using an appliance to decide whether to upgrade to a more energy-efficient option. 

Picking the right size of a home solar energy system depends on how much electricity you use. House load calculation is the first step in a solar system design to achieve optimal energy output to run various appliances and systems. Here is a detailed guide on how to calculate the electrical load of a house in India.

What Is Load in Electrical?

Modern lifestyle depends on electrically-powered appliances and fixtures. An electrical load calculation assesses the electrical burden of running everything connected to an electric circuit in a household. The common devices your electrical load table may include but not be limited to:

  • Incandescent lights
  • Toasters
  • Ovens
  • Space heaters
  • Dishwashers
  • Washing machines
  • Refrigerators
  • Air conditioners
  • Electric motors
  • Smart gadgets
  • Medical devices, if used recurrently
  • And more

A home electrical load calculator is a key tool in figuring out the impact of your electrical load on your energy cost. Also, the information helps you with your decisions associated with solar and battery storage.

When approaching “how to calculate the load of a house”, it’s important to understand that an electrical load can be defined and further classified in several ways. The most important definitions that homeowners would want to comprehend first are:

  • An electrical load is any equipment that uses electrical energy to function and converts it into a different energy form.
  • Electronic gadgets also consume electrical energy and convert it into motion, light, and heat among other electrical energy transformations.

House electrical load calculator measures electrical load represented by the total quantity of electricity required to run appliances, machines, lights, and other outlets.

For an accurate electrical load calculation formula, one should carefully factor in every appliance in a household that uses electric power to function. Your circuits mustn’t carry a load to its maximum capacity to avoid electrical overload. Practical advice is to keep it to 80 percent.

How to Calculate Electrical Load for a Home the Right Way

Do you want to pick the right solar energy system size? Perhaps you wish to ensure your electrical service is capable of meeting your home’s energy demand in all seasons. In such cases, “how to calculate electrical load in a house” is an important question.

Homeowners can figure out their electrical load through this widely-used formula of load established by industry experts. This approach calculates the total units of power (measured in amps) required in your home. 

For this load calculation formula, remember to keep a 20% margin to not overload the main circuit and ensure the safe functioning of all the appliances.

Calculating the electrical load formula for a piece of equipment requires identifying its amps (a measure of current), volts (a measure of voltage), and watts (a measure of power generated).

Ampere = Watts/Volt

Watts = Volt x Ampere

Using these formulas, you can put together a detailed load calculation sheet and determine the capacity of the main circuits and individual circuits. Start by jotting down the power consumption of your household appliances.

Here’s a representation of common appliances and their average power rating (in watts):

Appliances/Fixtures Power Rating (in watts)
Incandescent lamp 40 – 150
LED Bulb 4 – 25 
LED tube light 8 – 36
Fluorescent tube light 18 – 60
Table fan 30 – 70
Induction motor Ceiling fan 60 – 80
Cooler 100 – 500
AC (1 ton) 3,517
Refrigerator 150 – 400
Computer 100 – 250
TV 60 – 120
Smartphone charger 4 – 7
Space Heater 1,000 and up
Washing Machine 300 – 500
Microwave  700 – 1,400
Coffee maker 800
Toaster oven 1,400
Blow dryer 300 – 1,200

To get to the bottom of the “how to electrical load calculation formula”, let’s assume you use the following appliances. Here’s how to calculate the load of electricity of a house:

Number of Appliances Power Rating Daily Use in Hours Load Calculation
4 LED Bulb 9-watt each 10 4 x 9W x 10 = 360 watt
1 Cooler 400-watt 6 1 x 400W x 6 = 2,400 watt
2 Ceiling fans 70-watt each 18 2 x 70W x 18 = 2,520 watt
1 TV 100-watt 4 1 x 100W x 4 = 400 watt
1 Refrigerator 300-watt 12 1 x 300W x 12 = 3,600 watt (approximately)
Here’s what the total will be 9,280 Watt Hour

Wondering how to calculate load in kW? It’s simple. 

1 watt = 0.001 kW

Therefore, your daily load is 9.28 kWh or 9.28 units per day.

Considering that you use these appliances for the same number of hours daily, your monthly power consumption will be 9.28 x 30 = 278.4 units per month.

If the electricity tariff for your region is ₹ 8 per unit, your monthly energy bill will be ₹ 2,227.2.

Benefits of Electrical Load Calculation

Whether you use the connected load formula or have your load calculated by an experienced electrician, knowing this numeric value empowers you to make confident decisions. 

Once you understand how much energy different appliances consume, you can find energy-efficient technology to replace the ones using a lot of electricity. As a result, your electricity bills will reduce.

An electrical panel load schedule allows you to ensure your family’s safety in the house by carefully regulating the use of appliances to prevent overload. You’d also know when to upgrade your circuit capacity if you wish to purchase more appliances and smart gadgets.

How to Increase Load Capacity

Now that you know how to calculate load, you can find ways to resolve your overload issues and increase the load capacity of your main circuit. Installing a new circuit is important to accommodate increased domestic power capacity. Here’s what you need to know:

  • Replace fuse boxes with a circuit breaker. Fuse boxes often lack the space needed for new circuits. 
  • The breaker box has many slots to provide enough space for new circuits and their corresponding cables.
  • If you still lack space, add a tandem breaker instead of a single breaker.

Design Your Solar System Based on Your Electrical Load

Electrical load calculation is a crucial step in solar sizing. Once you know how much electricity your appliances use, you can pick a system capacity suitable for your energy requirements.

Select a solar inverter: It’s recommended that you oversize the solar inverter to avoid energy loss during the DC to AC conversion of power. For a total electrical load of 1000 watts, select an inverter of 1600 watts / 24 volts.

Calculate the total current of your load: Using the formula: Current = Power (in watts) / Voltage, you can determine how much current your solar system must generate to run the connected electrical load. Assuming the power to be 1000 watts and voltage as 24 volts, current = 41.66 amps.

Calculate the size of solar panels: To run your electrical load of 41 amps (as calculated in the previous step) plus 30 amps to charge a 300Ah battery, solar panels should make 71 amps.

A 250-watt solar panel, on average, produces a voltage of 30v. With this voltage and the current of 71 amps, we get a power requirement of 2,130 watts. The closest solar panel size available for this power demand is 250 watts. Hence, with 10 panels of 250 watts each, you can generate 2500 watts of electricity.

Frequently Asked Questions

What is an electrical panel load schedule?

Mainly used by electricians or engineers, a panel schedule is a diagram representing the panel’s details and the circuits connected to it. The schedule also mentions their corresponding loads.

What should I factor in the electricity load calculator in kW for home?

Depending on our lifestyle, we utilize a variety of appliances, fixtures, gadgets, and electronics on a day-to-day basis. Hence, it’s important to consider everything that uses electricity to accurately ascertain your electrical load. Also, consider appliances you don’t use regularly or for long hours, such as a blow dryer.

Why should I calculate my electrical load?

Understanding your electrical load is important to ensure that your electrical service or solar system size can supply ample power to meet your household’s energy requirements. You can also seek expert assistance to help you with the electricity load calculator in kW.

What is the maximum amp value in a breaker panel?

On average, a breaker panel used for residential applications has a maximum amp value of approximately 100 amps.

Does a 2bhk house have an electrical load of 200 amps?

The power requirement of a house depends on the type and number of appliances that family members use. On average, 40-63 amps is mostly sufficient for houses. Many electrical service providers offer an electrical load calculation formula pdf to help you calculate and understand your load.

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Amplus Solar

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