How to Calculate Your UPS/inverter Battery Back-up Time? (2024)
How to Calculate Your UPS/inverter Battery Back-up Time? (2024)
In today's world, where power outages are becoming more frequent and unpredictable, having an Uninterruptible Power Supply (UPS) or Inverter at home or office is essential. But how do you calculate the battery backup time of your UPS or Inverter? This question has been a hot topic lately, with many people searching for answers online. In this blog, we will guide you through the steps to calculate your UPS/Inverter battery backup time, using popular methods and techniques. So, let's get started and learn how to ensure uninterrupted power supply during emergencies!
There are different methods to calculate the battery backup time of your UPS/Inverter. Here are two popular methods:
Method 1: Using Battery Capacity and Load
The first method to calculate UPS/Inverter battery backup time is by using the battery capacity and the load. The battery capacity is the amount of energy that the battery can store, while the load is the amount of energy that your appliances or devices consume.
Step 1:Determine the Battery Capacity in Ah
To determine the battery capacity in Ah, check the battery label or manual. For example, if the battery is labeled as 12V 100Ah, the battery capacity is 100Ah.
Step 2:Determine the Load Wattage in W
To determine the load wattage in W, add up the wattage of all the devices connected to the UPS/Inverter. For example, if you have a computer with a power consumption of 150W and a monitor with a power consumption of 50W, the load wattage is 200W.
Step 3: Calculate the Backup Time
To calculate the backup time, use the following formula:
Backup Time (in hours) =Battery Capacity (in Ah) * Battery Voltage (in V) * Battery Efficiency (in %) / Connected Load (in W/h)
For example,
1. If you have a 1500VA UPS with a 12V 100Ah battery, and the total wattage of your load is 800W, the backup time can be calculated as follows:
Backup time = (battery capacity ÷ power requirement of load) × 0.7
Backup time = (12V × 100Ah ÷ 800W) × 0.7
Backup time = 1.05 hours or 63 minutes
Note: The factor of 0.7 is used to account for battery efficiency and other losses.
2. Suppose you have an inverter battery with a capacity of 150 Ah and an input voltage of 12 V, and you want to power three tube lights, three fans, and a Wi-Fi router using this battery. In this scenario, you may be wondering how long your appliances will run on this battery and what will be the battery backup time. To find out, let's calculate the backup time of your inverter battery and determine how long your devices will be powered.
Taking your inputs into consideration, you can calculate your total load, like:
- 3 tube lights = 40 x 3 = 120 Watts
- 3 fans = 75 x 3 = 225 Watts
- 1 Wi-Fi router = 1×20 Watts = 20 Watts
So, the total load in your case is 120 + 225 + 20 = 365 Watts.
Now, let us apply all these values in the above-said battery backup time formula.
Backup Time (in hours) = 150 x 12 / 365 = 4.9
So, your inverter battery will last around 4.9 hours to keep your needed appliances running.
Method 2: Using Battery Discharge Rate
The second method to calculate UPS/Inverter battery backup time is by using the battery discharge rate. The battery discharge rate is the rate at which the battery discharges during a power outage.
To calculate the backup time using this method, follow these steps:
Step 1:Determine the discharge rate of your battery. This information can usually be found on the battery or in the product manual.
Step 2:Determine the capacity of your battery. This is the same as step 1 in method 1.
Step 3: Calculate the backup time by dividing the capacity of the battery by the discharge rate.
For example, if the discharge rate of your battery is 10A, and the capacity of your battery is 100Ah, the backup time can be calculated as follows:
Backup time = battery capacity ÷ discharge rate
Backup time = 100Ah ÷ 10A
Backup time = 10 hours
Calculating UPS/Inverter battery backup time is essential to ensure uninterrupted power supply during emergencies. The two methods discussed in this blog, using battery capacity and load wattage, and using runtime provided by the manufacturer, can help you determine the backup time of your UPS/Inverter accurately. It's important to keep in mind that backup time can vary depending on several factors, such as battery age, temperature, and load type. Therefore, it's recommended to test your UPS/Inverter regularly to ensure optimal performance during power outages.
FAQ-
How do you calculate battery backup hours?
Backup time of UPS (in hours) = [ Battery rating (in Ah) × Battery rating (in V) × Number of Batteries × Battery Efficiency ] / Load in Watts (W).
How many hours is UPS battery backup?
If you have a 1,000-watt UPS that has 125 minutes of standby time, your battery backup would last for 8 hours with no power outage. If you have an extended power outage that lasts longer than 8 hours, then you would need to replace your uninterruptible power supply.
How many hours is a 200ah battery backup?
The total load for the same is = 350 Watts. Therefore, 200*12/350 = 6.8 hours (Approx.) Finally, 6.8 hours is your inverter's battery backup. In simple words, your battery will last 6.8 hours while running these appliances.
How many hours is a 150Ah battery backup?
approximately 6.2 hours
Now, in the final stage, let's apply all these values in the formula. Backup Time (hours) = 150 X 12/290 = 6.2 (approx.) Hence, in this case, the 150Ah battery backup time is approximately 6.2 hours, i.e., it can power your devices for 6.2 hours when fully charged.
What is the formula for battery hours?
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.
What is normal battery backup time?
Most last between 3 and 10 hours on a single charge. If yours runs out of power more quickly than it used to, don't worry—there are some simple steps you can take to get it back up to full strength.
How to calculate battery run time?
The calculator applies the formula: Capacity (Ah) x Voltage (V) x Efficiency / Load Power (W). This equation gives an estimated runtime based on the input values. For instance, a 100 Ah battery at 12V with 90% efficiency powering a 50W load would have a runtime of (100 Ah x 12V x 0.9) / 50W = 21.6 hours.
How to calculate UPS battery run time?
Understanding the backup time allows you to know how much time your devices have to operate once the UPS switches to battery power. The calculation would be: battery Ah rating x battery voltage (v) rating x the number of batteries x battery efficiency. Then divide this number by watt load.
Can a 200Ah battery run a fridge?
200Ah battery can typically power a fridge
If the 200Ah lifepo4 battery has a voltage of 12V, its output power would be approximately 2400 watts (12V x 200Ah). This means it can meet the power requirements of most fridges and enable them to operate properly.
How long will a 200Ah battery run a TV?
How to Calculate the Battery Capacity Required for Your Home: 48V 200ah battery is equal to 9.8 kWh or around 9600 watts. This is enough to run essential home appliances like a refrigerator, six light bulbs, a TV, and a laptop charger for 3.9 hours.