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In comparison to the past, electricity consumption in our homes has significantly increased. However, the supply from the grid doesn’t always remain consistent. Due to this, when the supply is interrupted, we need inverters and batteries to power our appliances at home. But many times, we impulsively buy inverter batteries without proper consideration, and later regret it because we don’t get the desired backup.
The primary reason for this is that we choose inverter batteries without calculating our home load. For example, if you need to run a cooler, fan, and lights on the inverter for 10 hours, and if your fan, cooler, and lights run only for 5 hours, you would need to double the number of batteries in such a scenario. If you have a single 150 Ah battery, you’ll need to add another 150 Ah battery.
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How to Calculate Inverter Battery Backup Time
Determining the backup of an inverter battery is not as straightforward as it may seem. The backup of a battery depends on various factors such as the load you’re running, the duration for which the load operates, the capacity of the battery in ampere-hours (Ah), the quality and rating of the battery, and more. Below, I will provide you with a formula that will help you estimate how many batteries or Ah capacity you might need.
To calculate the battery backup, first sum up the loads that will run on your inverter, like:
Fan (1) = 70 W
Lights (3 * 10 W) = 30 W
Cooler (1) = 150 W
Refrigerator (1) = 100 W
Total = 350 W
Now, multiply the battery capacity by 0.8 (power factor) and divide it by the total load:
Battery Backup = Ah x V x N x 0.8 / Total Load
For instance, if you have two 150 Ah batteries and are running a load of 1750 W:
Battery Backup = 150 Ah x 12 V x 2 x 0.8 / 1750 W = 1.6 hours (approximately)
However, it’s important to note that we assumed a power factor of 0.8 here, which varies in different inverters and can be 0.7 or 0.9. Inverters with higher power factors provide better backup. You can use this formula to estimate backup, keeping the power factor in mind.
According to the above example, if you need a backup of 3 hours, you would require four 150 Ah batteries.
When purchasing batteries, consider your needs. If you need to run a heavy load, opt for C10-rated batteries, and if you require prolonged backup, go for C20-rated batteries to ensure a good backup.”
Note: The formula and calculations provided are based on the information you’ve given. Real-world scenarios might have additional complexities, so it’s advisable to consult a professional before making any decisions.
How to increase backup of inverter battery
Many people face issues with inadequate backup from their inverter batteries, often feeling that their investment was wasted. However, this isn’t necessarily the case. If you find that your battery backup is not sufficient, there could be several reasons for it. Here are a few common factors to consider:
High Power Consumption
Many people mistakenly attribute their poor backup to excessive load on the inverter. However, the real issue could be a low battery capacity. To address this, it’s advisable to minimize appliance usage and only run essential devices during power outages. This practice can help you achieve better backup times. If needed, consider adding an extra battery to increase backup capacity.
Incomplete Charging
It’s important to understand that a normal 150 Ah battery with a C20 rating typically requires around 20 hours to fully charge. Ensure that you have sufficient charging time, especially if you receive limited hours of electricity during the day. If you have a 150 Ah battery with a C10 rating, it would need approximately 10 hours to fully charge.
Pay attention to whether your battery is reaching a full charge. If you face extended power cuts and your battery doesn’t fully charge, considering solar panels might be beneficial. Solar panels can help you charge your battery during daylight hours.
Battery Health
Although the chances are low with a new battery, it’s possible to receive a defective one. In such cases, consider replacing the battery with a functional one to ensure reliable backup.
If you find that your battery is in good condition, yet the backup remains insufficient, it might be a good idea to consult with a professional who can assess your specific situation and provide tailored advice. Remember that the quality of the battery and its compatibility with the inverter also play crucial roles in determining the backup time.
By understanding the factors that affect battery backup and taking appropriate steps, you can optimize the performance of your inverter battery system and ensure reliable backup during power outages.
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