Battery Backup Time Calculator

Backup time is the duration your battery system can power your lights, fans, computers, or other essential devices without interruption. A battery backup calculator helps you quickly estimate this time so you can plan ahead with confidence.

To understand backup time, it helps to know how batteries store and deliver energy. Every battery holds a certain amount of power, determined by its capacity (measured in ampere-hours, or AH), voltage, and the number of batteries you’re using. However, you can’t use all of the stored energy. To protect your batteries and extend their lifespan, it’s best not to discharge them too quickly or too deeply. Most experts recommend keeping the load at or below 10% of your total battery power—exceeding this can shorten battery life and reduce performance.

Batteries are often paired with solar systems to provide backup power at night or during load-shedding when your energy supply depends entirely on stored solar power. The calculator below makes it easy to estimate how long your battery backup will last based on your specific usage.

To use the calculator, simply enter:

  • Your maximum load in watts
  • The number of batteries
  • Each battery’s voltage
  • Each battery’s capacity in ampere-hours

In seconds, you’ll get an estimated range for how long your batteries can power your devices.

Example

Suppose you’re using two 12-volt batteries, each rated at 100 AH, to run a 200-watt load. With an efficiency range of 60%, you can quickly estimate your backup time using the calculator:

Data:

  • Number of batteries = 2
  • Battery voltage = 12 V
  • Battery capacity = 100 AH (Ampere-hours)
  • Load power = 200 W (watts)
  • Efficiency range = 60%

Calculation

Formula;

Back up time = No of batteries * Battery Voltage * Battery Capacity * Efficency / Load Power

Back up time = 2 * 12 * 100 * 0.6 / 200 = 7.2 hrs ≈ 7 hrs

Battery Backup Calculator

Q/A Section

Q1- What is a battery backup time calculator?

A battery backup time calculator is a tool that estimates how long a battery can power your devices based on its capacity and load.

Q2- Why is calculating battery backup time important?

It helps you plan for uninterrupted power, avoid equipment shutdowns, and manage your energy use efficiently.

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