DC Backup for Security Cameras, Communication, and Street Cabinets
A total of approximately 100 watts of devices need to be continuously powered 24 hours a day. This setup includes security cameras and communication elements installed in parks, streets, intersections, etc. DC backup systems for security cameras, communication, and street cabinets are essential. At Advice, there is a commitment to providing solutions for the implementation of this project.
In many cities worldwide, including in Israel, a project called "City Without Violence" or "Safe City" is emerging, aimed at providing security and peace of mind for city residents. Public safety and a sense of security are key elements in residents' quality of life, impacting the city's and region's ability to grow and thrive. This is achieved by deploying a technological infrastructure in the required areas, which is essential for the success of the program. This setup includes security cameras and communication elements located in parks, streets, intersections, and more. This requires the deployment of control centers, sensors, and a communication and control system that supports real-time intervention in law enforcement efforts.
To meet this need, Advice has developed a vision to provide solutions for the implementation of the project. The DC backup system for security cameras, communication, and street cabinets is designed to operate 24/7, providing constant and reliable backup power for applications. Advice designs and manufactures all solutions for providing stable power to these systems in locations without 24-hour electricity access or where there is no power infrastructure, often using solar energy.
In locations where electricity is available for limited hours, such as streetlights that operate only at night, backup power is needed to supply all site loads, such as security cameras, tracking systems, routers, cellular data modules, switches, etc. Advice takes on the challenge of ensuring continuous DC power throughout the day.
The DC backup systems for security cameras, communication, and street cabinets are designed and built to meet each site’s specific requirements. Considerations include the hours of available grid electricity, the internal and external loads, and the hours required for power backup. These systems are comprehensive, including the cabinet itself, designed for outdoor installation under harsh weather conditions, either mounted on poles or on the ground close to the cameras, with all necessary components inside. This includes chargers, batteries, battery protection systems against over-discharge, lightning protection, AC input breakers, DC output, and all communication equipment required for the site.
In general, DC backup systems for security cameras, communication, and street cabinets are outdoor cabinets with IP55 sealing for weather resistance, sun, water, dust, and other environmental factors. They come equipped with locks for protection against break-ins and can include ground bases or concrete foundations for stability.
Alternatively, these cabinets can be made with brackets for mounting on street poles (with limited weight). Typically, streetlights provide available grid power at night, which is used to power the cabinets and charge the batteries.
Typically, such power supply is calculated for 8 hours a day, so a backup power supply for an additional 16 hours is required to provide continuous power to the system throughout the day. For daytime hours when street lighting is inactive, the batteries in the cabinet take over as needed for the entire system. To charge this "battery bank," DC power is supplied, calculated for a suitable charger that can sufficiently charge the batteries and supply power to the loads during the designated hours of power supply set by the electricity company.
The protective system for the batteries includes a Low Voltage Disconnect (LVLD) system designed to protect the batteries from over-discharge and to prevent accidental power supply to the site due to a failure in the electricity supply.
The backup cabinets can be designed for various required voltage levels: 12V, 24V, 48V DC, and if necessary, they can include inverters for 220VAC in a PURE SINE WAVE configuration. Additionally, the cabinets are equipped with fans to ventilate the interior and circulate air from inside to outside.
In special cases where there is a demand, the cabinet functions can be enhanced to allow for remote monitoring of the battery status and remote reboot of the computing systems within the cabinet.
Here is an example calculation for designing a DC backup system for security cameras, communication, and street cabinets: At the site, predefined loads will be installed:
- 25W PTZ camera
- 30W DVR
- 15W Public Address System
- 30W Industrial Switch
This totals approximately 100 watts of consumers that need to be continuously powered 24 hours. If there is a regular power supply from a streetlight for 8 hours each night, then the remaining time for backup is 16 hours of the day, which means a total backup of 160 watts is required.
To determine the capacity, a CYCLING battery must be chosen for multiple charge and discharge cycles. For example, taking a European battery company called MONBAT, the MVR family can support over 1,000 charge/discharge cycles at a Depth of Discharge (D.O.D) of 50%, allowing for a total of 3,200Wh. Dividing the power by 16 hours, we need a battery capacity of 3200W/16, totaling 200A, which concludes the chosen battery.
For this battery, a charger must be selected that can charge the battery during the electricity supply from the grid at a charging current of 20% of the battery value, which is 40A. For this purpose, a charger from MEAN WELL will be selected to provide both the charging current and the power supply to the system loads.
The total current supply needed can be described as: I total = 40A + (100W/12Vdc) = 40A
The battery charging voltage is approximately 13.8Vdc, so we will take a charger with a capacity of: 13.8Vdc X 48A = 662W
For this, we will choose a charger from MEAN WELL's PB series of smart chargers with multi-stage charging regimes, specifically the PB-1000-12 model, which will confidently provide both the required charging current during the designated charging time and the necessary supply for all consumers in the system.
For free consultation and personalized matching to the backup system suitable for you, call Advice: 03-900-9000.