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How to Calculate UPS for CCTV System

This article is a collaborative effort, crafted and edited by a team of dedicated professionals.

Contributors: Muhammad Baballe Ahmad, Mehmet Cavas, Sudhir Chitnis, and Zhen-ya Liu.

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If you are looking for a guide on How to Calculate UPS for CCTV System, then you have come to the right place. This blog post will show you the step-by-step process on how to calculate the UPS for your CCTV system.


This guide will discuss how to properly size a UPS for a CCTV system. Electrical power systems and their associated loads, especially ones with critical applications, should always incorporate some form of backup power in case of an unexpected power outage. Uninterruptible Power Supplies (UPS) are an essential part of many security systems, providing both battery backup power in the event of a mains electrical outage and also surge protection against sudden increases in voltage caused by lightning strikes or other power-related issues. The correct sizing and selection of the UPS is vital to ensure the system runs smoothly throughout its life cycle.

The amount of battery capacity required for any given CCTV system or any other load is influenced by several factors such as: operating temperature, total current drawn from the batteries, availability of battery charging outlets and UPS efficiency rating among others. This guide will provide information on how to calculate and size each individual component in order to come up with the best overall solution for your project.

What is UPS?

Uninterruptible power supply (UPS), also known as a battery backup, is a device that supplies electric power to connected equipment when mains power fails. In the case of a mains failure, a UPS takes over as the main source of electricity, providing protection to valuable equipment and ensuring the smooth running of critical operations.

The UPS provides three key functions – it can protect against brownouts or momentary voltage sags in the mains, it can provide surge protection for electrical spikes and transients, and it can provide backup energy in case of an extended outage. The longer the duration of the outage, the larger capacity battery is necessary for adequate backup power.

For CCTV systems to remain operational during any type of outage or interruption, a UPS typically needs to be able to support enough wattage hours for an average camera load running at 12V DC and 5A (which is roughly 60 watts). Calculating how much wattage hours you need from your UPS depends on two factors – the total number and type of CCTV cameras you are using plus their average amperage draw together with how long you expect your cameras will need to remain powered in case of an extended blackout.

To calculate wattage hours/battery capacity needed: multiply your camera’s total amperage draw (5A x 12V DC) by the number of cameras times how many hours you want them to stay powered (60 watts x 10 cameras x 8 hrs = 4.8 Kilowatt Hours). Depending on these factors, a basic CCTV system may require anywhere between several hundred watt-hours up hundreds kWHr of battery capacity.

Calculating UPS

Uninterruptible Power Supply (UPS) is a critical component of a CCTV system. The UPS is used to provide backup power for the cameras in case of a power outage. This can help ensure that the CCTV footage is not lost. Calculating the UPS for a CCTV system can be a difficult task. And it is important to get it right to ensure the safety and security of your premises. In this article, we’ll discuss the process of calculating UPS for CCTV systems.

Calculate the total wattage of the system

When considering the power requirements for a CCTV security system, the total wattage is one of the most important factors. This total wattage includes both the cameras and their accessories such as pan-tilt, motorized zoom and any other peripheral components. The total sum of all these loads is known as the Total System Wattage or UPS (uninterruptible power supply).

To measure the total system wattage, first determine how many power supplies are in use. Multiply the current rating of each one by its voltage rating to get an individual component’s wattage. Then add up all these component wattages to get your total system wattage. Some cctv systems also use DC power supply instead of an AC-to-DC converter, so factor that into your calculation as needed. Also consider that a marginal level of excess capacity helps protect against overloads in case additional accessories are added.

To calculate your total estimated watts required for your CCTV security system you need both voltage and current information listed on each component datasheet or website specification page along with its operating temperature range taken into account for good measure. Many security camera systems today provide monitoring video streams over Cat 6 Ethernet networks so you need factor network related components such as switches and routers into your equation as well if applicable. Also be sure to take lighting fixtures into consideration when computing Watts requirements if that’s part of your set-up to best understand what type of UPS unit will fit your needs from both a voltage and amperage perspective .

Calculate the total current of the system

Knowing the power requirements of a Closed Circuit Television (CCTV) system is crucial when calculating the necessary Uninterruptible Power Supply (UPS) needed to back up the system. In addition to providing emergency power when there is an interruption of utility power, UPS also protect equipment from data spikes and over voltages. The following steps will help you calculate the total current of your CCTV system and determine the correct UPS for your needs.

The total current of any CCTV system can be found by adding together all individual device currents, as well as any additional surge protective components that may be part of the setup. The first step is to list each camera’s current draw – this information can usually be found in the camera’s documentation or in its product specification sheet. The total current for each camera should then be multiplied by its operating voltage – typically 12 volts DC or 24 volts AC – to determine its wattage consumption.

Next, list any additional surge protection components that are part of your CCTV setup, such as an automatic voltage regulator (AVR). By combining these parts and their corresponding wattage ratings, you can arrive at a total figure for your entire CCTV system’s off-load current draw in Watts. This number must then be converted into Amps by dividing it by the standard operating voltage used in the project (either 12v or 24v).

By taking into account all components that make up a CCTV system’s power requirements, it is possible to calculate the necessary UPS that will adequately back up and properly protect this type of electronic equipment. To ensure uninterrupted operation during a power outage, it is important to select a UPS with enough capacity to handle both initial surge currents and long-term load requirements.

Calculate the total VA of the system

To calculate the total VA of your CCTV system, you need to know the power requirements for each component. Most equipment will have the power requirements listed on its label. If not, you should contact the manufacturer for information. You also need to factor in any addition components such as illumination or a surge protector for lightning protection.

Once these power requirements are calculated and added together, this is your total VA (or Volts-Amps) requirement for your system. This is the key number used by UPS manufacturers with their other formulae to work out how much battery backup time you should need in an emergency.

If you’re unsure what size of UPS is appropriate for your system, it’s best to seek advice from a qualified Electrician/CCTV engineer who can offer professional guidance tailored to your specific installation needs.

Calculate the total battery capacity

In order to accurately calculate the total battery capacity for your UPS system, you need to understand how power output from a battery can vary. As a general rule of thumb, when calculating battery capacity, you should add one hour of run time for each amp-hour that your batteries can output. This means that the total capacity of your batteries will be determined by the amount of current and voltage that are stored by the batteries in a given hour.

For example, if your UPS system needs 600 Watts (W) of power and your battery is capable of outputting 10A at 12V/DC (or 120W), then you should add 10Ah to your calculation since it will provide approximately 1 hour’s worth of power at this rate.

It’s important to remember that different types of loads require different amperages and hence require different calculations; so make sure you understand the load before you calculate what size or type of batteries are required for you CCTV system. Additionally, as most CCTV systems will have cameras installed over long distances (sometimes in hard to reach locations), it is important to factor in any voltage losses due to resistance caused by long cables when figuring out how much reserve power is needed.

Calculate the total run time

To Calculate the number of UPS (uninterrupted power supply) required for your CCTV system, you need to first calculate the total run-time of all associated equipment, including cameras, monitors, lighting and other components. Convert all run times into one standard unit such as watts or amps (amps = watts/volts). Multiply this total by the number of hours you need to maintain an uninterrupted supply. If multiple components are running simultaneously, add them together for a total amount of power that needs to be supplied by the UPS.


The UPS for a CCTV system must be selected based on the total wattage of all components in system. It is important to understand the difference between continuous wattage and peak watt rating, as this will help ensure adequate power is provided for the installation. Additionally, you should factor in surge protection and other features that may be included with some UPS models for added protection of your camera system. After taking all these factors into consideration, you’ll be able to select an appropriately sized UPS that can adequately power your CCTV installation.

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