Selecting Power for Video Surveillance

Author: Ethan Ace, Published on Feb 24, 2013

Power is an important, yet unfortunately overlooked, element of video surveillance systems. While power is relatively inexpensive, mistakes in designing, supplying and backing up power can cause significant reliability problems.

Many of the most common service problems can be traced back to issues (or flat out errors) with specifying and planning power for video surveillance.

When power is commonly discussed in the industry, the focus is on Power over Ethernet (as if PoE is the one key issue). Though PoE is important, many times it cannot be used and, even if it used, it does not eliminate the other issues involved in powering surveillance systems.

In this report, we examine power options for video surveillance and factors impacting their selection and use. We recommend users review 6 main issues in designing power for video surveillance:

  • Determining Power Budget (Power Needed vs Provided)
  • Appreciating Specific Application Power Requirements
  • Deciding on Form Factor for Power Supplies
  • Deciding on AC vs DC (where applicable)
  • Specifying Backup Power
  • Selecting Overcurrent Protection

***** ** ** *********, *** ************* **********, ******* ** ***** surveillance *******. ***** ***** ** ********** ***********, ******** ** *********, supplying *** ******* ** ***** *** ***** *********** *********** ********.

**** ** *** **** ****** ******* ******** *** ** ****** back ** ****** (** **** *** ******) **** ********** *** planning ***** *** ***** ************.

**** ***** ** ******** ********* ** *** ********, *** ***** is ** ***** **** ******** (** ** *** ** *** one *** *****). ****** *** ** *********, **** ***** ** cannot ** **** ***, **** ** ** ****, ** **** not ********* *** ***** ****** ******** ** ******** ************ *******.

** **** ******, ** ******* ***** ******* *** ***** ************ and ******* ********* ***** ********* *** ***. ** ********* ***** review * **** ****** ** ********* ***** *** ***** ************:

  • *********** ***** ****** (***** ****** ** ********)
  • ************ ******** *********** ***** ************
  • ******** ** **** ****** *** ***** ********
  • ******** ** ** ** ** (***** **********)
  • ********** ****** *****
  • ********* *********** **********

[***************]

********, ** ******* ****** ***, ** **** ** ***** ***/** 12VDC *****. **** *********** ******* *** ***** **** ***/**** ***** also ****** ** ******* ***** ** ****. *******, **** ************* support**** ***** *****-**** *******. ** **** ******* *** ** ***** *******, but *****, ***’* ***** **** *** ******.

AC ** ** ************

** ** ** ** * *********** *********** ** ***** ************. Alternating *******, ** **, ************ ******* ***** (******** *********). ****** in *** ******** ******** *** *** **** ******* ************, ** can ** ******* ** *** **** ** ********* ******** **** easier **** **. ** ********, ****** ******* ** * ************** flow ** ***********, ****** ** ***-******* ************. ********* *** ***** cells **** ******* ** ******* *** **** ** ******** ** AC ** ******.

***** ************ ************ *** ***:

  • ****: * *********** ** ********** *****
  • ***: *** ******* ** ********
  • ****: * **** ** *****, *** **** ** ***** ********** energy ** ********* **** ****** *****. **** **** ********** *** Milliamps, ******* ** **, ***** ** *** ***-********** ** ** Amp.

Choosing ******* ** **. **

****, ** *** ****, ******* ***** * ****** ******* ***** and *****. *** ******* *********** ****** ******* **** ** ********. For ***** *********, ******* ***’ *** *****, ** ***** ** acceptable. ****** ****, ******* **** ******* *** ***** *** *** camera ****** ** *******. **** ** ***** ***** ***** **.

******** *** ******* ****** *** ******* ******* *** ******* ******* drop ***********. ** ** * ****** ** ***** ** **, at *****, ** ***** ******* .** ****, ** *** *********, of *******. ** * ***’ *** ** ** *** ****, this ******* ** ************* * **** ****. *****, *******, ******* that ******* ** .*** *, ********* ** **** .* **** loss. *** **** ******, ***** ***** ******** *** ********* ****, instead ** *****.

****, **** ** ***** ******* **** **** ****** *****, ***** power ******** *** ***** ** **** ** ***** ******** ***********, through *** *** ** ******* ********** (**** ** *********** ***). ***** ******* ******* ***** ***** ** ***** ** *** camera.

Power ******* - ***** ** ***

*** ******* *** ******** **** ** ******* ***** ************:

  • ******* + *******, *.*., ***** @ **: ***** **** ** power ****** *****, **** ***** ** *** ****** ******* *** total ******* ********.
  • *****, *.*., **: ********* **** **** ** **** ** ****** specs, ***** **** *** ********* ******* ** ********.

** ******* **** ** ***** *** **** *****, *** *** following ********:

  • ***** (** *****) = ******* (** ****) * ******* (** Volts)
  • ******* (** ****) = ***** (** *****) ÷ ******* (** Volts)

***** ****, *** *** ***** ** *******, **’* *** **** this ****** ******** .** ****, ** *** *********, ** ***** (A=9/12=3/4=.75), *** .*** ****, ** *** *********, ** ***** (*=*/**=*/*=.***). This ********** ******* ********* **** *********** *** ***** ******, ******* later ** **** ******.

Power ******

**** *********** *** **** ** ***** ****** ****** *** *** project, ** **** ** **** * ****** ** ******:

  • ** ***** * ***-******* ***** ******: *** ***** ******’* ***** supply *******, ** **** *** *** ***** ******’* *** ******* per ******. **** ** *** ****** ** *** **** ** PTC (********* *****) ** **** ******.
  • ** ***** * *** ****** ** *******: *** ****** ** midspan’s ***** *** ********.
  • *** ******’* (*** ***** *******) ***** *********** *******. **** **** occasionally, *** *** *** “********” *** “***” ** “*****” ***** consumption *******. ** ** *********** **** “***” ** ****, ** this ** *****-**** *** ****** *** **** ******** ** ************.

** **** ** *** ***** ******* *********** ** *** ******* and ***** ******* ***** **** **** *** ****** *** ***** current ******** ** *** ***** ******, *** ********** ****** *********** protection *******, *** ***** ****** **** ******** ********.

******* *: ********* ********** ******* ** ** *******, ***** ******* * ***** **** -- ***** @ ***** ** ***** @ *****. ** ** are ***** ********** **********, ** ***** *** ***** **** **** ***** ****** **** 16 *******, ** *** ***** ******* ***** ** *** (.******), and *** ***** ****** ** ***** *** **** ***.

******* *: ***** *** **** ******* ** *****, *******, ** could *** ********** *******, ***** ******** ** @ *****, ***** *** ***** ***** be .******* ** **. *** **** ** **** ***** ****** output ** **** **** ***** *** ****’* ******, ** **** present ** *******.

******* *: ********* ********** *** *******, *** ********** ***************** ******, ** *** ***** ***** ******* ****** ** ****** the ***** ******’* ******* ****** *******. **** ****** ******** ***, which ******* ** *.*** @ *****. **** ****** ** ***** the **** ****** ** *.**. *******, **** * ***** ****** current ** **.**, **** ***** ** *** ******* *** ** used -- * ***** ** ************* *** -- ** ******* four ** ***** ******* ***** ******* **** ***.

******* *: ********* ******** ** *******, *** ****** ******* ******, ** ***** ***** ***** *******, ** *** ****** ******** only ** (***** * ***). *** ****** ** **** ** supply *.** ****** *** *****, ** **** ***** **** ******* just ****.

******* *: ***** *** **** ****** ** *****, ******* *****-** *******, ** ***** **** ****** *** ** **** ** ***** cameras ****** ********* ***** ******, ** *** ****** **** ****** 15W ** ***** ** ** ** **** *******.

Power **** ********

**** ** ***** ************ ******* ***** *** ***, ********* ***** over *** **** ******** ***** **** ** **** **** ******* the ****** ** ***** ******, *** * ******.

*** ******* *** ********** **** *****:******* *** *******. ******** ***** *** *** ****** ******** **** *** ******, making *** ** ***-**-*** ************. ******** ********* ** ********** ********* between *** ****** *** *** ******. ****** *** ******* **** switch ** *******, *** **** *** ******* ** ** *** camera. ******** *** ***** **** ** ******** ************ **** ******** switches *** ***** ****, *** *** ******** *** **** ***** used ** *** ************.

*** ** ******* ** *** **** *********, ***.***-**** *** ***.***-****. The ******, ***.***, ********* ***** ** ** ** **.*** ** available ** *** ******** ******, ** * ******* ** *****. The ***** ********, ***.***, **** ***** ** ***+ ** *** Plus, ********* ** ** **.*** ** *** ******* ******. ***** are ******** ** *** ****** ***** **** ****** **** *****, in **** ***** ****** ****, *** ***** ** *** ****** to ***.* *********. *** ***+ ******** *** *********** ******** ******** more ***** **** ******** *** *** ********** ** **** ***** a ***** ******* ** **** *****-****** ******* ** **** ***** via * ****** *****. ***’* *** ******** ****** ******** ******** with ******* *** ******* ********* *** *** ** ******* **** a *** **, ** **** *****, * ***+ ****** ** midspan. **** ******** ** ********** ***** ** *** *** * separate ***** ****** ** *********, ***** *** ** **** ***********.

*** * ******* ********* ** *** ******** *** ******* **** PoE, ** ********* ********* * ********:

Non *** ************

*** ** ***** ********* *** ******** ******* ** ** ** surveillance ******, ***** ** ******* *** ******* ******** ** **** camera. ******* ******* ************ ******* *** *** ** ******** ***** supplies:

  • *** ** ******/******* ** ******* ******* ** *** **** ****** situation ********* * ********** ***** ****** ** ** ************. ***** outdoor ******* ***** ******* **-*** ** *****, *** *** ******* may ******* **-***. ******* ************ ** **** ***** *** *** possible **** ******** *** *** ******* ********-****** ***** ********.
  • ** ***** *************, ****** ******* **** ***** ******* ** ************ local ** *** ******, ** **** ********* **** **** ** it *** ** ********** ** ******** ***** *****, ******** *** use ** * *****-****, ***-*** ******.
  • **** ***** ********-****-**** ** ***** ***** **********, *** ****** **** require * ******** ***** ******, ***** ******* ** ***** ***** types **** ********* ***** ********* *****.
  • **** ***** ** ************, * ******** ***** ****** ** ********* required. ***** ****** *** ****** **** ********* ************ ***** ****** PoE *****, **** ** *** ********* ********* ****** ***** * PoE *******, ** ** ******** * **** ***** *** ********* be **** *** ****. ** *** *** ****** ** *** has ***** ********* *****, ** * ******* ** ***** ****, PoE ************ *** **** **** *****, *** ***** ** *** illuminators ** ******* ** ***** ***’, ** ***’ ********* *****. Note **** **** ****-********* ** ************ **** ******* ***-*** *** power, *** ***-*******.
  • **** ********* ******** ************ *******, ***** ***** ** ******. **** wireless ************ ******* (*** *** ******** *********** ****) ***** *** ******, ******** *** ****** ** ***********

Form ******* ** ***** ********

***** **** ************* ******* ** ********* ******, *****-****** ***** ******** are ********* ****. ***** ***** *** ********* ** ****** ****-***** or ****-***** **************. **** *****, ** * ******** ** ***** mounted ** * ****, *** ***** ****** **** ** ****-******* with **, ** ****** ******* **********. ** *** ******** ** a ******* **** ******, *** ***** ****** **** ********* ** wall-mounted, ***** ***** *** ******* *** ****** **********. *** ****** of ******* ** ***** ***** ******** *** **** ***** ** multiples ** ****, * ******** ********* **** ***** *** ** conjunction **** ****, ***** **** ******** ******** *, *, **, or ** ******. ****** ***** **** ***** $** *** * 4-output ****-***** ***** ****** ** $*** ** **** *** * 32-output ****-***** **** (******* **** ******).

***-******* ***** ******** *** **** ********* ** * ******-****** ****-** "wall ****" *****. **** **** ****** ** ****** **** ** multiple ****** ************* ***** ****, *** *** ***** ** **** in *********, ** *** ****** ***** *******. ******** **** **** a *** ******* **** *** ******** **** ******-****** ***** ******** greatly ********* *** ****** ** ** ******* ********, ** ** not ***********. ******, **** ***** *********, ******-****** ***** ******** *** often **** **** ******* ******* ******** **** ******/******* ***/** *** cameras. ****** ** ****** ****** ***** ******** ***** **** ***** $5 *** * ***** ****-** *********** ** $** *** * hardwired ** *********.

******* ************* *** **** ******- *** *****-****** ***** ******** ** whether **** **** ** ******* ******* ** ***. ******* ***** supplies *** ***** **** ********** ******* ** ************ ***** ************ in *********** *** ********, *** *** ********* ****** ** * weatherproof **** *********. ***** ********** *** ** ******* ******** ** a **** **** ****-******* *******, *** *******, **** ** ***** enclosure ******. *** ******* ** ******* ***** ***** ******** ******** in *** ******** ********* **** $**-*** ******* ** *** **** of * ****.

Backup ***** **************

***** **** ********** ****** ***** ******** ** ******** ********* ***** circuits, ***** ******** *** ** ****** ** ** *** ** two ****: ********* ** * *** ** **** ** ***** in *******.

********* ** * ***

*** ***** ****** *** ****** ** ********* ** * *** along **** ***** *********. **** *********** ** ********* *** ********** when **** *** ************ ********* ** ********. ******* *** ** calculated *** ****** ********* ** ** **** *** **** ******* each ********** **** *******. *******, ** ****** **** ***** ******* and * ****** ***, ******* ************** ** ******* ******* **** communication ******* *** ******* ******* **** *****. ***** *** ******** system ******** ******** *** ***** ** ****** ***** **** *** system *** ***** ******** *** *********, ***** *********** ******** * new ****** ** ***, ** **** */* ********* **** *** UPS ******* *** ****** ** ********* ***** ** *** ************ system, ** **** ******** ******* ** ***** *******.

***** ** *******

***** ******** **** ********* ******* ****** *** ******** **** *********. Use ** ********* ******* ****** ****** *** ************** ******** *** increases ************** ** ****** *******. *** *********** ********** (***** $*** ******) ******* ***** ****** ****** *** ($***+ ******) *** ********. ***** ***** ******** ***** ********* ****** power ** ** ********** ***** **** ** **** ** ******** to *** ***** ******. *******, ******** *** ***** ****** ** battery-backed, *** ********* ********* *** ********** **** **** ***** ******* backup ** **** ****, **** ***** * ***. **** *********** results ** ******** ********** ****** *** ********* ******* ** ***** failure, ******* ** ***** *** *********.

** ***** ***** ****** ***** ******** *** ******** *******, ******* backup ** *** ***** ****** ** ********** ** ************ ** a ***. ** ******* ** ***** ********** *** ********** ******, and * ***-******* ***** ******/******* **** ********* *** ****** *****-**** than * *** **** *** **** ******* ********.

*** ****** ** ****** ******* ***** ** ********* ** *** given *********** ** * ****** ** ********** *** ************ *** the ******** ******. ** *** **** *****, ****** ** ******** recommended *** ******* ***** ************ *** *********** ** ****** *** sags. * ***** ****** ** ****** **** ****** ******* ** shutdown **********, ***** ******* *** ****** ** ****** *** ** forced *********, ***** *** ******* ********* *** ************* *****. **********, if ****** ******, ** ** ********* ** ****** ** ***** 1-2 ***** ** ****** *******, ****** ** **** *** ***** losses ** ***** ******* *** ************ ** ****** *********.

Overcurrent **********

*** ***** ************* ** *********** **********. **** ******** *** ******** camera ** ***** ****** **** ***** ******* ****** * ***** come ** ******* **** **** ******* ******.

  • *** ***** **** ** *********** **********, *** ******** *********** *********** Resistor, ** ******* ** * ******* *******. ** ******* ******* through *** *** *********, *** *********** *****, ***** ****** * dramatic ******** ** **********, *********** ******* *** *******. ** *** PTC *****, *** ******* ** **** ***** ******.
  • *** ******, *** **** ****** **** ** ********** ** *** fuse, ***** ******** ** * **** ***** ***** ** **** that ****** ***** **** ******* ** *** *****. ***** **** are ********** ** **** **** ***** ********** **** *** *********** condition ** *******, **** *** ** ****** ********** *** **** to ****, *** *** ******* *** ********* ******. *****, ** the ***** ****, **** ****** **** ** *** ******** *******, almost ************ ******** ********* ** *********. **** *** ***********, *******, and **** ****** ******* ****** ************ ** ******* *****.

** ********* ***** ** ********* ** **** *** ****** *********. PTC’s **** ***** **********, *** ****** ***** **, * ******* call **** ****** ****** ** *********, ** *** ******** ****** is *** *******, *** **** ***** *** ***** ********* **** caused ** **** ***** ***** * ******* **** ******** *** situation. ***** *** *********** **** **** ** ** ********** *** not ********** ** ********* ******, *** ******** **** ** **** reset ****** *** *** ******* * ******* **** ******* **** weaker, *** * ****** *** ********** ** ********** ** *** fuse ***** ****.

Login to read this IPVM report.
Why do I need to log in?
IPVM conducts unique testing and research funded by member's payments enabling us to offer the most independent, accurate and in-depth information.

Related Reports

$8 Billion Utility Georgia Power Enters Surveillance Business Offering Avigilon And Genetec on Jul 19, 2017
Utilities are typically considered major customers of surveillance integrators but one utility, Georgia Power, with $8+ billion in annual revenue...
Power For Burglar Alarms on Jul 14, 2017
In order to operate, alarm panels require the high voltages found in electrical outlets be converted to the low voltages they run on. In this...
Batteries For Alarm Systems Tutorial on Jul 11, 2017
Alarm systems use backup batteries in order to continue working if an intruder attempts to disable the alarm by cutting power to the building. In...
Smoke Detectors Guide on Jul 06, 2017
Smoke detectors and carbon monoxide detectors add a life-safety component to burglar alarm systems. As intrusion detection sensors are used to...
H.265 / HEVC Codec Tutorial 2017 on Jun 30, 2017
For years, video surveillance professionals have talked about the potential for H.265. Now, in 2017, H.265 is starting to gain mainstream...
HID Edge EVO Tested on Jun 07, 2017
HID Edge controllers have been one of most common offerings in IP door controllers for years. The new generation is called Edge EVO. We tested...
Arlo Go Cellular Cloud Camera Tested on May 23, 2017
Totally wireless surveillance cameras are growing but almost all typically depend on a hub and local Internet access. However, many outdoor...
Selling and Valuing Security Integrators on May 12, 2017
This ia a tutorial in how to (1) determine your security integrator's value and (2) to sell your security integrator. If you own an integrator,...
Alarm Circuits Guide on May 09, 2017
Alarm circuits are a fundamental element of wired burglar systems. Designing the alarm circuit greatly affects its performance. In particular,...
Smartphone Controlled Kevo Lock Tested on May 04, 2017
Smartlocks are a growing market, with millions sold. Kwikset's Kevo is one of the most common choices, using the Unikey smart phone access control...

Most Recent Industry Reports

Security Robots Are Just Entertainment on Jul 21, 2017
Great entertainment, no real security value.  That is the happy (or sad) state of security robots in 2017. Knightscope robot's drowning, the...
Wireless Burglar Alarm Sensors Guide on Jul 21, 2017
Wireless sensors for burglar alarm sensors are an increasingly common option for the historical labor intensive wired alarm systems. However,...
Competing Against ADT on Jul 20, 2017
ADT is one of the biggest players in the security industry, with ~$4 billion revenue. In 2017, they were acquired / merged with Protection...
Hikvision Launching Deep Learning Recorders on Jul 20, 2017
Hikvision has become a common choice for super low cost NVRs. Now, Hikvision is aiming to move up market, with deep learning NVRs that claim far...
PR Campaign Exploiting Manufacturer Cybersecurity on Jul 20, 2017
Manufacturers increasingly have a bulls-eye on their back. As cyber security solutions providers grow, they realize a great way to get publicity...
Axis Door Station Tested (A8105-E) on Jul 19, 2017
Axis continues their push into niche markets, especially audio, with network speakers, an IP horn, and video door stations. We bought and tested...
Manufacturer Favorability Guide on Jul 19, 2017
This 120 page PDF guide may be downloaded inside by all IPVM members. It covers our 20 manufacturer favorability rankings and 20 manufacturer...
$8 Billion Utility Georgia Power Enters Surveillance Business Offering Avigilon And Genetec on Jul 19, 2017
Utilities are typically considered major customers of surveillance integrators but one utility, Georgia Power, with $8+ billion in annual revenue...
Knightscope Laughs off Robot Drowning on Jul 18, 2017
A day after a Knightscope robot drowned, Knightscope has issued an 'official statement' making fun of the issue: The implied message is that...
Microsoft Video AI Cloud Services Examined on Jul 18, 2017
Microsoft has released one of the most amazing video analytics marketing videos ever. In it, they detect oil spills, track individual people giving...

The world's leading video surveillance information source, IPVM provides the best reporting, testing and training for 10,000+ members globally. Dedicated to independent and objective information, we uniquely refuse any and all advertisements, sponsorship and consulting from manufacturers.

About | FAQ | Contact