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!

Arun Abraham

You can calculate backup time using the tool. https://backupcalculate.com

Ntege Willy

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

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

V good sir

Babul nath

My 1 one 5 ⭐inverter AC 8 fan 12 watt 20 nos. Who mach Requirement Microtek inviter
200Ah ×36 V ups 3750va

Babul nath

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

MARTINS LUTHOR

Coinfx market is a big scam broker, i paid a huge amount of \$70,000, they persuaded me, into putting more of my hard earned money with all hope to get profits in return, they won’t allow me to make a withdrawal of my investment, all because all they wanted is to steal my money, i got advised to file a refund case against them, which to my greatest surprise i was able to withdraw my money, i contacted a recovery expert { MORRISGRAY830@GMAIL.COM } and his team of recovery experts, they where able to assist me with the withdrawal of my money, and restore my funds, they are very responsive, and you can reach out to him for help also, i know am not the only one who has fallen victim, people out there might also need this information!

How to calculate backup time of lithium battery. And how to determine capacity of inverter to charge lithium battery?

JOEY AJAINO

but this is how I calculate mine, in lead Acid/tubular battery,
battery (ah) x battery (v) / load… =backup time in hrs

For lithium battery 15kwh/2000w(load) =7.5hrs backup time…

Ch.poojitha

Battery backup calculation

joy halder

how do i calculate battery backup time for two batteries each 100Ah 12.8v lithium connected in series with a load of 5000kwh

Ssali

Hello Eng. How can I calculate the backup time for 2 batteries connected in series, 200ah/12v lead acid, supplying a load of 450w. Thx

Ssali

Hello sir , how do I calculate battery backup time for two batteries each 200ah, 12v lead acid connected in series with a load of 450w?

Looking for laptop UPS backup

Syed afaq

Hi sir . Plz tell me about battery .
Battery capacity??

ഏറ്റവും കൂടുതൽ വിറ്റഴിക്കപ്പെടുന്ന ഉൽപ്പന്നങ്ങൾ

Loom Solar Engineer Visit
Sale priceRs. 1,000 Regular priceRs. 2,000
Reviews
Loom Solar Dealer Registration
Sale priceRs. 1,000 Regular priceRs. 5,000
Reviews

Available near you

ജനപ്രിയ പോസ്റ്റുകൾ

Solar Resources

Work with Us

Calculators