How to choose the right inverter & battery for your home?

How to choose the right inverter & battery for your home?

In the current setting, power outages may be highly inconvenient, as energy is necessary for practically every part of our lives. Inverters have a role in this situation. An inverter is a tool that transforms DC electricity from batteries into AC power, which can provide power equipment in the home while the power is off. However, choosing the right inverter for your home is critical to ensuring an uninterrupted power supply during such situations. Choosing the best inverter might be difficult because there are so many brands and types on the market. We will walk you through selecting the best inverter for your home in this article so you can make an informed choice and take advantage of an uninterrupted power source during a power outage.

Understanding power requirements

Before purchasing an inverter for your home, it is essential to understand your power requirements. Knowing your power requirement will help you choose an inverter with the right VA (volt-ampere) rating, ensuring it can support all the electrical appliances you want to run during a power outage.

Definition of power requirement

Power requirements are the total quantity required to run all of your home’s electrical equipment in the event of a power loss. The quantity and power requirements of the electrical appliances you intend to use during a power outage will influence this requirement.

Calculation of power requirement based on the number and power

List all the electrical devices you intend to use during a power outage to determine your power needs. For instance, if you want to run three fans, three tube lights, one CFL, and one television during a power outage, you will need to calculate the power consumption of each appliance.

Consumption of electrical appliances

Assuming that each fan consumes 70 watts, each tube light consumes 60 watts, the CFL consumes 25 watts, and the television consumes 120 watts, the total power consumption would be:

3 fans * 70 watts = 210 watts

3 tube lights * 60 watts = 180 watts

1 CFL * 25 watts = 25 watts

1 television * 120 watts = 120 watts

Therefore, the total power consumption would be 535 watts.

Knowing your power requirement lets you determine the VA rating of the inverter you need to run all your electrical appliances during a power outage. Selecting an inverter with the appropriate VA rating is essential, as an undersized inverter may need help handling the power demand. In contrast, a large inverter may lead to a waste of electricity.

Finding the VA rating of the inverter

Once you have determined your power requirement, the next step is to find the appropriate VA rating for your inverter. Volt-Ampere rating, or VA rating, refers to the voltage and current that the inverter supplies to your electrical appliances.

It is important to note that if an inverter operates at 100% efficiency, then the power required by your electrical appliances and the power supplied by the inverter will be the same. However, ideal conditions do not exist in reality, and most inverters have an efficiency range of 60% to 80%. The power factor of an inverter, which is just the ratio of the power needed by your electrical appliances to the power supplied by the inverter, is another name for this efficiency. The majority of inverters have a power factor between 0.6 and 0.8.

Calculation of VA rating using power requirement and power factor

You can use the following formula to determine your inverter’s VA rating:

Power supplied (the VA rating of the inverter) = Power requirement (power consumed by appliances in watts) / Power Factor (efficiency)

Here, the average power factor or efficiency, which is 0.7, is taken into account. For example, if your power requirement is 550 watts, then the VA rating of your inverter will be:

Power of inverter (VA) = 550/0.7 = 786 VA

An inverter with an 800 VA rating would be the best option for your home because they are widely accessible on the market. By selecting the appropriate VA rating for your inverter, you can ensure that your electrical appliances receive the right voltage and current, leading to their efficient functioning and longer lifespan.

Knowing the Battery Requirement

Any inverter system’s foundation is its battery, and the performance and lifespan of an inverter are mainly dependent on the battery’s quality. It is essential to select the proper battery capacity for your inverter if you want to ensure an uninterrupted power supply during a blackout.

Calculation of battery capacity

Battery capacity is the amount of charge the battery can hold. It determines how long the inverter can run all the connected appliances. Ah (Ampere Hours) units are used to measure battery capacity. There are various types of batteries on the market, including those with capacities of 80 Ah, 100 Ah, 150 Ah, 200 Ah, etc.

To determine the appropriate battery capacity, you need to consider the power requirements of your home and the number of backup hours you need. For instance, you would need to determine the battery capacity as follows if you wanted your inverter to run three fans, three tube lights, one CFL, and one TV for three hours during a power outage:

Battery capacity = power requirement (in watts) * Backup hours (in hrs) / Battery Voltage (in volts)

Assuming the power requirement for the given electrical appliances is 550 watts and a battery voltage of 12 volts, the battery capacity you would need is (550 * 3) / 12 = 137 Ah.

Consequently, a battery with a capacity of 137 Ah will be the best option for your inverter. Choosing a good-quality battery with a longer life span is essential to ensuring that the inverter runs efficiently for an extended period without any glitches.

Final Selection

After understanding the power requirement and knowing the VA rating, and battery capacity, it’s time to finalize the inverter for your home.

The appropriate VA rating and battery capacity can be selected based on the power requirement calculated earlier. For instance, an 800 VA inverter and a 137 Ah battery would be adequate to run three fans, three tube lights, 1 CFL, and 1 TV for 3 hours during a power outage if the power requirement was 550 watts.

Understanding these calculations is crucial to making the correct decision when choosing an inverter for your home. By doing so, you can avoid misleading information shared by inverter dealers and ensure that the inverter you purchase is appropriate for your power needs.


  • What factors should I consider when choosing an inverter for my home?

     The key factors to consider when choosing an inverter for your home include your power requirement, the VA rating of the inverter, and the quality of the battery used with the inverter.

  • How do I calculate my power requirement for an inverter?

    To calculate your power requirement, determine the number and power consumption of all the electrical appliances you plan to use with the inverter. Once you have this information, you can use a power consumption chart or an online calculator to estimate your total power requirement.

  • What is a VA rating?

    The VA rating of an inverter refers to the maximum amount of power the inverter can deliver to your appliances. It is calculated by multiplying the power requirement by the power factor.

  • How do I select the appropriate VA rating for my inverter?

    To select the appropriate VA rating for your inverter, calculate your power requirement and choose an inverter with a VA rating equal to or greater than your calculated power requirement.

  • What is the best battery to use with my inverter?

    Think about the type, capacity, and quality of the battery you choose for your inverter. A high-quality battery with sufficient capacity and a suitable type can ensure reliable backup power for your home.

  • Can I use any battery with my inverter?

    No, not all batteries and inverters work together. It’s crucial to pick a battery made especially for use with your inverter to have the best performance and longevity.

  • Why is it important to understand the calculations when choosing an inverter and battery?

    Making an informed selection and picking the appropriate equipment for your home can be aided by being aware of the mathematics involved in selecting an inverter and battery. This can guarantee the long-term dependability, effectiveness, and affordability of your backup power supply.

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