Calculating the backup time of an inverter battery is crucial for ensuring uninterrupted power during outages. Backup time is essentially how long the battery will last while powering connected devices. The calculation is influenced by multiple factors, such as battery capacity (measured in ampere-hours, or Ah), the total load on the inverter, and the efficiency of the inverter itself. The formula for calculating the inverter battery backup time is straightforward:
Backup time (in hours) = Battery capacity (Ah) x Battery voltage / Total load (in watts).For example, if your inverter has a 150Ah battery and operates at 12V with a load of 300 watts, the backup time will be approximately 6 hours. However, the efficiency of the inverter (usually around 80-90%) should also be considered, as it can affect the actual backup time. With this knowledge, you can accurately assess how long your inverter will keep your devices running during a power cut. Experience seamless power back up with a
UPS battery designed to protect your devices from outages and voltage fluctuations, ensuring your work continues uninterrupted. Explore your options now.
How to calculate inverter battery backup time: Key steps
Determine battery capacity:
The first step is to know your battery’s capacity, usually expressed in ampere-hours (Ah). This figure shows how much charge your battery can store. For instance, a 150Ah battery can deliver 150 amps of current for one hour or 75 amps for two hours. Higher capacity batteries will provide longer backup times, but it is important to choose the right one based on your power needs.
Understand the battery voltage:
Inverters typically operate with 12V or 24V batteries. Battery voltage affects how much power is available for use. For a 12V inverter battery, the formula will take this voltage into account when calculating backup time. Make sure to choose a battery that is compatible with your inverter’s voltage rating to ensure optimal performance.
Identify the total load:
The load refers to the total power consumed by the devices connected to your inverter. This is measured in watts. To calculate the load, add up the wattage of all devices you plan to use during a power cut. For example, if you are running a fan (75 watts), a TV (100 watts), and a few lights (50 watts), your total load is 225 watts.
Use the formula:
Once you have the battery capacity, voltage, and load, you can apply the formula:
Backup time (in hours) = Battery capacity (Ah) x Battery voltage / Total load (in watts)
This will give you an approximate figure for how long your inverter battery can run before it needs to be recharged.
Factor in inverter efficiency:Inverters are not 100% efficient, and most operate at around 80-90% efficiency. This means you should multiply the backup time by the efficiency rate to get a more realistic estimate. Maximise your solar energy potential with a
solar inverter, efficiently converting sunlight into usable electricity, making it a smart choice for sustainable living. Explore today.
Inverter battery backup time calculation: A comprehensive table
Here is a table that outlines the estimated backup times for various
inverter battery combinations. Please note that the actual backup time can vary based on the efficiency of the inverter and other factors.
| Battery Capacity (Ah) | Voltage (V) | Load (W) | Backup Time (hours) |
| 100 | 12 | 200 | 6 |
| 150 | 12 | 300 | 6 |
| 200 | 12 | 400 | 6 |
| 100 | 24 | 300 | 8 |
| 150 | 24 | 450 | 8 |
Updated price list of inverter battery in India (2025)
| Model | Price |
| Livguard IT 1548TT | Rs. 11,999 |
| Luminous red charge RC 18000 150 Ah | Rs. 12,999 |
| Amaze 5260TT | Rs. 17,800 |
Disclaimer: The features, availability, and pricing of each model are subject to change and may vary. For the most accurate and up-to-date information, please visit the official website.
Head to your nearest Bajaj Finserv’s partner store to explore and choose from an extensive range of batteries. You can utilise a limit of up to Rs. 3 lakh to purchase your preferred model and repay the amount over flexible tenures ranging from 1 month to 60 months.
Explore inverter batteries on EMI with Bajaj Finserv
Bajaj Mall is the greatest online store for finding a large selection of inverters and batteries from top brands. Once you have decided on the perfect goods, head to one of our partner stores to make your purchase. With simple EMI options, you may choose a repayment period that meets your financial demands. Get zero-down payment incentives on select models, making it easier than ever to stay powered during outages. Discover the convenience of a
mini inverter, perfect for powering small devices on the go, ensuring portable energy solutions for your travels and outdoor adventures. Explore your options now.
Benefits of shopping with Bajaj Finserv
Competitive prices
Bajaj Finserv partner stores offer competitive pricing, ensuring that you get the best deals on your inverter battery purchase. By shopping with us, you can save on costs while ensuring you get a quality product.
Easy EMIs
Purchasing an inverter battery on Bajaj Mall is simple and stress-free, thanks to our Easy EMI options. You can break down the cost into manageable monthly instalments, allowing you to enjoy uninterrupted power without a financial burden.
Zero down payment
For select products, you do not have to worry about paying anything upfront. With our zero-down payment offer, you can take home your chosen inverter battery without any initial investment, making it more affordable for you.
Wide selection
Bajaj Finserv provides a wide variety of inverter batteries from renowned brands, so you can find the right product that meets your needs. With options available online and at partner stores, shopping is convenient and hassle-free.
Special offers and cashback
Take advantage of special offers and cashback deals when you purchase an inverter battery through Bajaj Finserv. These promotions help you save even more while ensuring you get the best possible product for your needs.
Complimentary home delivery
On select products, we offer free home delivery to add to your convenience. This means you can receive your new inverter battery without any extra charges or hassle.
