This is a general question that arises in people's minds, and they ask it to battery dealers. Below is the way the battery shop owner can tell you the simple formula to calculate the backup time of the UPS, also generally known as battery inverter?
Back up Time of Inverter battery = Battery Volt x Battery AH rating / Total watts on Load.
The calculation shows the approximate value because there will be some energy loss when you are converting 12 battery power to 220 volts using an inverter. For example, we cannot figure out the exact power consumption of a ceiling fan as the power consumption will be low when the fan runs at a low speed.
The UPS allows the safe way for computers and connected equipment to shut down in an orderly manner. It depends on the size and design of the UPS to determine how long that power supply will be.
There are generally three types of UPS; it is explained below:
Standby has the most basic level topology of UPS. Standby UPS restores the battery backup power in the event during problems such as blackout, voltage sag or voltage surge. Whenever the incoming utility problem faces common problems like a blackout, voltage sag or voltage surge, the UPS switches to DC battery supply and inverters to AC power supply to run the connected equipment. Generally, this type of UPS is designed for consumer electronics, entry-level computers, POS systems, security systems and other basic levels of electronics.
This type of technology allows correcting minor power fluctuations without switching to battery. This type of UPS has an autotransformer that regulates low voltage and over voltage without switching over to battery. So it is typically used for PCs, gaming systems, network equipment, entry-to-mid range server.
It provides a consistent, clean and near-perfect supply of the power regardless of the incoming power. This UPS works on a technology that it converts incoming AC power to DC, and then while providing backup, it supplies back in AC. It has zero transfer time. It is used for critical IT equipment, data center installations, high-level servers, storage applications and advanced network equipment. So it protects the things from damage caused by power blackout, voltage sag, over-voltage, voltage spike, harmonic distortion, etc.