How to Calculate Inverter Battery Backup Time?

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Whenever you plan to buy an inverter battery, there is a desire to know some important information in your mind. Like how much will be the backup of the inverter battery, how many hours of backup will be available for how many ah batteries, etc. In this informative information, here you will know the backup time calculation formula.

Backup Time Calculation Formula:

Backup Time = Battery Capacity (in Ah) * Battery Voltage (in V) * Battery Efficiency (in %) / Connected Load (in W/h)

For example:

Case 1: Lead Acid Battery

If you have any capacity of lead acid battery (80Ah to 200Ah), then you can calculate battery backup time as per below example. I have taken here the most popular inverter battery 150Ah battery. When we calculate battery backup time of any type of battery, we ideally use 400-watt home load, so the connected load is 400 watts per hour. Let’s calculate backup time now:

Backup Time = 150Ah * 12V * 0.75 / 400 W

= 1350 W / 400 W

= 3.3 hrs.

Note: An efficiency of lead acid battery is approx. 70% to 75%

That means, if we run 400-watt home loads on 150Ah inverter battery, then it gives approx. 3 hr. 30 minutes backup time. Depending upon backup time, you can choose battery capacity.

Case 2: Lithium Battery

If you choose a lithium battery for home inverter such as 100Ah, 12.8V, then you can calculate backup time as per above formula. All parameters will be same, let’s know backup time of lithium battery:

Backup Time = 100Ah * 12.8V * 0.98 / 400 W

= 1254 W / 400 W

= 3.13 hrs.

Note: An efficiency of lithium battery is approx. 95% to 98%.

That means, if we run 400-watt home loads on 100Ah lithium inverter battery, then it gives approx. 3 hr. 15 minutes backup time. Like this example, you can calculate backup time of CAML 100, 5kWh lithium inverter battery.

Source: Himanshu Chaprana, Student of B. Tech (Electrical & Electronics Engineering) - Manav Rachna International University, Faridabad, Haryana

हिंदी में पढ़ें: जानिए अपने Inverter Battery Backup Time को कैलकुलेट करने का तरीका!

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14 comments

Ntege Willy अगस्त 20, 2024 at 14:17अपराह्न

FM Radio Broadcasting Equipment, 8KW and 4KW Transmitter systems for two sites and at each location there is 12000btu Air Conditioner (3516w power capacity), I do need a Quotation for Grid Solar Inverter Battery Bank System for FM Radio Broadcasting.

Ntege Willy अगस्त 20, 2024 at 14:15अपराह्न

FM Radio Broadcasting Equipment, 8KW and 4KW Transmitter systems for two sites and at each location there is 12000btu Air Conditioner (3516w power capacity)

Abdul aziz from pakistan जून 15, 2024 at 13:15अपराह्न

V good sir

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My 1 one 5 ⭐inverter AC 8 fan 12 watt 20 nos. Who mach Requirement Microtek inviter
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Babul nath जून 07, 2024 at 21:09अपराह्न

My 1 one 5 ⭐inverter AC 8 fan 12 watt 20 nos. Who mach Requirement Microtek inviter

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