Powering Cameras over Long Distances

Author: Brian Rhodes, Published on Sep 19, 2013

In the age of Power over Ethernet, specifying external camera power is becoming a lost art. Increasingly what was once a common skill - estimating voltage drop - is an uncommonly needed exercise. However, cameras cannot always use PoE, and powering devices over long distances (e.g., hundreds of meters) requires proper calculation and sizing.

Sizing Power in 5 Steps

******** **** ****** **** *** ******** ******* *** ******** **** it ** **** *********** **** ******** ** **** **** **** the ****** ******** **** **** ********. ** *** ***** ********, the ****** *** *** **** ** ***, ** *****, ************* malfunction. ********* *** **** ***** ***** **** ****** *** ***** power ** ********, ***** ****:

  1. ******* ***** ******* ** ******
  2. ********* ****** ********
  3. **** **** **********
  4. ********* ******* ****
  5. ******* ******* ****/ ***** ******

An ******* *******

**** ** *** ***** ***** **** ** **** *** * theoretical *******: ****** ** **** ** ***** ****** *** ****** **** *** ****** **** *** ***** ******. (** **** ****** ******, assume * ********* *******.) ** **** *******, ** *** ***** * run ** **** ***** ****** **** *** ********(**** ** *** ******* ******** *** ******) *** ******* ************. As * ******, ** **** ** **** *** ***** ***** supply ** *** ** *** **** ***.  ** ***** **** step *** *****:

*. ******* ***** ******* ** ******: **** *** *** *******, ************ ******* *** ********* ** ** 24 **** *******. *******, *** **** ** ******* ****** ******* either ****** ******* (**) *** *********** ******* (**) **************. ******* it ** ***** (***** ********) *** **** ****** ** **** ranges, ** ***** ** (***) ** * ****** ***** *******. This ***** ********** ***** **** ** ***** ****** ** **** use, ** *** *** ***** ******** (**** ***** ******** *** surveillance ************) ****** *** ***** ** ****** ********.

*** **** *** ** ******* **** ***** ** ** ***** the******'* **** ***** ** **** ****. ** *** *******, ** *** *** ****** ******** *****:

*** ***** ****** **** ****** ~** ***. ** **** *****, we **** **** ***********, ******* ** ******* ****** *****.

*. ********* ****** ********: ****, ** **** ** ********* *** **** ******* *** ****** pulls ****** *********. **** *** ** ********** **** *** ****** wattage ** *** **** *****:

** *** *******, *** ****** **** ** *****. ******* *** unit ** * *** **** ********* **********, **** ** * rather **** ***** ******** ********* '*****' ***** ***** ***********. ***** *** ******** ** *** *******, ** *** *******/********* requires *****, ** **** ** *** ***** ****** ********. ** any ****, ** **** ****** '*******' **** '********' ***** *** following *******:

* = *(*) / (** × * )

***** * = ****, *(*) = *****, ** = ***** ****** (*** ********** *******, *** a value ** *), *** * = ****** *******. *********:

*.** **** = ** /(* * **)

*** ******* ****** ******** **** **** * *** *** *********. Again, **** **** *** ****** ***.

*. **** **** **********:*** *** '**** ********** ****' *****, **** ** * ************ value ***** **** * **** ********* ** ********* ****. (****** vs. ********, ******** **. ***** *********) ***** ******* *** ******** provided ** ***** *************. ****'* * ***** ** ********** (*** one ******** ****) ** *** **** ****** ****** ****** **** in *** ******* ****, ** ** ***** ** *******:

*******, ********** ********* ***************** ******** *** ****** ***** ** *******, ** ********* **** conductor *****. *** *** *******, ** **** **** ** *** 18 ***** ****** *****, ***** ***** ** * ********** ** 0.00651 **** (*** ****).

*. ********* ******* ****: ** *** *** *******, ** **** ** *** ***** *** meters, ** ***** *** ****. ** **** *****, ** **** all *** ****** ****** ** ********* ***** ******* ****, ** the ****** ** ******* **** ** ********** ****** *** ****** ** run:

******* **** = (**** ********** ****) / ((***** ********)/(****)) * (Camera ****)

** *** *******, *** **** ** ** ***** **** **** * camera **** ***** *.** **** ***** **** *** ******* ** follows:

*.** ***** ******* = *.** * (***/****) * *.** ****

****** *** ****** ** *** ***, ** **** **** ~ 5 ***** *** ** **** **********.

**** ******* *** ***** *** ****** ********* +/- **% ** the ******* '******' *******. **** ***** * ** *** ****** will ******* ******** **** * ** *** ****** ** *** voltage **** ** ****** * *****. *******, * * **** drop ***** **** ******* *** '*** *******' *********, ** ** are ****** ** ******** ********* *******:

*. ******* ******* ****/***** ******: ***********, ** **** *** **** ** ***** **** ******* -

******** ******* ** ****** ******:** *** ****** * ***** ****** ***** *** * ****** voltage **** **** ** **** ** *** ******. *** *******, **** ******** **** ******* ** *** ** *** ******. ****** * ***** ** the ****** ** *** *** ******* ** ~** *** ********* at *** ******, ***** ***** ****** *** '*** *******' *********:

******** **** *** ******** ** ****** **** *** ****** ** the ***, *** ** *** ****** ******** *.** ****, ** can *** **** ***** ****** ******** ** * ****. **** ********** **** **** ******* *** **** ****** ** *** example, **** **** ******* **** *** ******** **********. ** ***** ***** $*** *** ******.

******** ******** ********** ** ****:** ********** *** ******** ** *** ***** *******, ** ******** the ********** ***** ** *** *******. ** *** *******, ** **** 18 ***** **** **** * ********** ***** ** *.** ***/ thousand ****. *******, **** ****** **** ** *** ** ***** cable **** * ********** ***** ** *.** ***/ ******** ****. This ******* *** '******* ****' ***********:

******* **** = (**** ********** ****) / ((***** ********)/(****)) * (Camera ****)

** *** *******, *** **** ** ** ***** **** **** * camera **** ***** *.** **** ***** **** *** ******* ** follows:

*.** ***** ******* = *.** * (***/****) * *.** ****

****** *** ****** ** *** ***, ** **** **** ~ 2 ***** *** ** **** **********. ** **** ****, *** voltage **** ***** ****** *** '*** *******' ********* ******* ******* up * ******** *****/** ***** ******.

Bigger **** ** **** *****?

*** ******** ***** **** *** ******** "***** ****** ****** * chose, * ****** ***** ****** ** ****** ****?" ** *** example, *** ******* ***** **** **** ****:

*** ****** *, ***** * ** *** ****** *** ** AWG ****, *** **** **: ~($*** + $** =) $***.

*** ****** *, ***** * ** *** ****** *** ** AWG ****, *** **** **: ~($*** + $** =) $***.

** *** *******, ***** *** ****** ****** *** ******* **** is ********** **** *********, *** *** ****** ****** **** ********* to ********* ***** ** ***** *******. ********* ***** ** ***** ****** **** include greater **** ****** ******, ************* ******* ******, **** ***** ** ******/*******, *** ******* **** to **** *** **** ** *** *****.  *******, ****** ***** supplies *** ** **** *********, ******** **** ****, *** *** have * ****** ************ *********.

*** '**** ******' ** **** ******** ***** **** ******** ***** other *******.  ** **** *****, **** ******* - ****** **** AND **** ***** ******** *** **** *******-**** *** ********** ****** for ****** *** ****-**-***** *******.

**********

**** ** ***** ** ********** *****, ************* *** ******** *** 'five *****' ***** **** ********* ****** ********* ** ***** **********, every ****.

Comments (31)

12 **** ** *.** *** *** **** ?

" *** *** *******, ** **** **** ** *** ** gage ****** *****,

***** ***** ** * ********** **6.51 **** (*** ****). "

***, ***** **** *******

****'* * **** *****! *** *** ******* ***** ** ****, not **. *** *** **** ***** ****- ***** *** **** foot ******. **** ****** *******.

******!

**** ******* *** ****** ****, *** ** *** **** *** option, ***'** ****** ****** *** ******* * ****** ******* (*** 48 ** **) ******* ******* ***** *** ** *** ****** housing, *** ********** * ***** *********** ** ********* ******** ***** (such ** ******** ** ***** ** *****) ** ******** *** required ** ** ** ***** ** *** ******. ******** ********, this ******** ***** *** * *******-********* "*****" ****** **** ***'* change ****** ******* **** **** *** **** ******* ****** *** or ****** **********. ******* * ******** **** ** *** *** of * *** **** *****, *** ****** ** ********* ****** voltage ****** ***** *** ** * ******* ** ***'** ********* near *** **** ** *** ********* ****** (***** *** ** quite * *** **** **** +-**% ** ** **********).

**** ***** ** ** ********** ** ****. * *** ** put * ****** ** * ******** *** ** *** ****** of * ***-******-***** ********** **** ****, ****** ** * ******** for * ******* ****... ** ******** ****@**, ** * **** fed ***** **** * **/* **** **** *** ****** ***** supply ** *** ****** ***, *** * ** ********** ***** regulator ** **** *** ******, *** ****** ** *** *********** output. **** ******* ********* **** *** *** ***** *** ***** now...

****** *** *** ********, ***. ** ****** ** ***** *** fundamental ** ******* **** ***********, *** **** ************** ** ********** a '**** *****' ******* ***** ** **** *********/**********.

*** ******* * ***, *** *** ****** ******** **** * blower/heater/defroster/wiper/illuminator ** *********** ** * ******** ****, *****?

**!

** ***** **** ****** *** ** * **** ****** *********. The ******* **** **** ** ****** *** **** ** *** camera *** ******* *** **** **** ** *** ***** ****** to ******** *** *******. **** *** ***** ******* **** **** be ****** ** *** ******* **** *** **** **********.

*****, ****** *** *** *******.

* ** *** ********** **** *******/*********, *** **** ** **** voltage **** ** *** ****** ** **** ** *** ********* with.

***** ** *********** ** * ******* - * '****' ** both ******** (***/*****) *** ******** (*****) **********. ******* **** ** cumulative ** *** ********, ** **** **** *** ****** *** feet ****.

** * ************* **** ********, ****** *******. ******!

*****, * ******* **** ** ***** ** **** *** ******** side ** *** ******, ********* *** *********** ***** ** **** into ******* ***** ****. ** *** ****** ** ** *** ft, *** *********** ***** ** ******* **** **.

*******://***.***********.***/*********.****** **** ****.

**** ** *** **** ****** *********. ****** *** ****** ********** for ***** **** ** ******** ** ***. ******, *****

*****, **********:

****** *** *** ********. * **** ****** *** ***** *** mentions ** *** ** ******* ****** ***** *****. ****, ****'* a ***** ********* *****:

**!

"*********** (#*******) **********" *** ********* ** ******. ** ***** ** differently, *** ***** ******* **** **** ******* ** *** ******* drop ** *** ******** **** **** *** ******* **** ** the ****** ****, ******* **** ***** **** ********* **** ***** resistance. ( * ***** ***** *** **** ******** **** ***** that ***** ***** **** ** ** ***** ****). *** *** available ******* ** *** ****** **** ** *** ***** ****** voltage ***** ***** *** ******* *****. ** ** *********, *** resistance ** ****** ** *** ***** ** *** * ****** wire *** *** *** * **** ** ***** (******** *** return) ***** *** **** ************ ****** ******* ******* ** *** the ****** **** ** **** *** *** ****** **** *** current ********** **** *** ****. ***** *** ****** ** *** ft. ****, *** ******** ****** ** *** ******** **** *** the ****** **** **** ** **** **. *** *** ******* drop **** ** ****** ** **** ***** ** **** ************. Please ******* ** ** * ** *****.

*** ***** **** * ***** ***** **** ** ******. *** someone ******** *** ******** ** ******* ** ***? ** ***** electronics, ** **** * ***** ******* **** ****** **** ******* each ********** **********, ******* ******* ****** (***** ******) ***** ** current, ****** *** ******** *** *** *** ******** *** **** flow **** ** *** ******* ******. ** ***** ** * path * = ******** *** ******** *** **** * = flowing *** ** ********. ******* ** *********** *****, **** * and * ** ** ***** *** ******** ********** ** *** path ** ** *****, ** ** ******** ** ** **** or **********. *** ******* ** ******* **** * **** ***** wire, *** ******** ********** **** ** ************* **** ****** ** affect *** ******* ****** (***** ******). **, * ***** ** valid ** ******** **** *** ***** * + *, ** B ** *** ********* **** **** *** * ** *** entering **** ** *** **** (**** *** ** ********, ** it * ****, ** * *** ******). * ******, ** be **** ** *** ******** ********* ** * *********** *****, get * ***** ******** *** *** ****** ** ***, *** feet, *** ** *** **** *** *** *** **** *** black **** ***, ** **** ****. *** *** ** *******, and *** ***** *** ***** ** ****, *** * ********** and ******* *** ******** ********** ** ** *******. *** *** what *** ***.

***** ******, ** **:

*'** ***** **** **** ******* ** **** ********: ***** ** no '********' ****** ** ********* *** ****'* ***** ****** ** not:

*** *******: **********'* *****(*** ****: '****** ** **** ** *** ****'):

****** *****(*** ****: '****** ** ********* ** *** *********, ********** ** two'):

*********** *** ***** ****** ******* ** ***** ******* ** ********** values *** **** ** ********* *** ******* ****.

**** **** **** ********** ****** **** ****** ********* **** ********* paths (* '******* *****'), ** * ****** '*** ***' ****** gives * **** ******. *** *****, * ****** ******* ******* from *** ** ****** ** ********* ** *********** *** ***,*** '******** **' ** *** ******. *******, **** ************'* ****** do ***, ******* **** ***** ** *********** ** ***/** **** lengths *** *** ***** ********. *** ******* **** ***** ** strands **. ******. **. ********* ******** **. ********** *** ** terminations (***** ******** ** ********?). ** ** ***** * ************* subject, **** * ****** ** **** ******** *******.

*** ******: **** **** *** ****** ** ********* *** ***** to *** ** **** ******* ******-*** ** ****-*** ******.

****** *** ****** *** ********! **** ******** *** **** *******, and *** ** *** *** ** *** *** ****** ****.

** ** * **** ********* *** ** *****, ********* *** need ** ** * **** ** *** ******, *** **** to **** ***** *********, **, **********, ***** *********** (** **** out *** **** **********).........***

*** ***** *** *** ** ******* *******, ********** *** *******. If *** **** * ****** ******** ** ***, *.** ** 2A ** **** ** ** * ** ***** ******. ****** 3A ***** ****** *** ******* @ *** **** *** ****/******/***** a **** ****** ***** ***** @*** @** @**. ******** ****** amperage (**, **) ** *** ***********, ******* *** *** *** seriously ************ ** *** ************ ***** *** **** **** **** bare *****. ********* ** ** **** ** *** *********** ******* (AC) ****** **** ** (****** *******) ** ******** ** ******* in **** ******** ***********.

** ******!

***** *** ***** **** ** **** ********* "****** ** ***** supply *** *** **** *** ****/******/***** * **** ****** ***** works ** *** **@**" ** ********** *******, *** ****** **** is *** *******. *** ** **** ******* **** **** ***** will ***** ***** ************* ****** **** ***** ******** **** ****** cuts *** *** ****** **** *******, *** ** **** ******* neither ** *** ** **** ***** *************. * ******* **** you *** **** **** ************* ** ** ***** *** ** so. * ******* **** ***** *** ********* ***** ******* ********* carrying ******** ****** **** **** ** ** ******* *** *** left ******* ** ********** *****. **** *** **** * ***** supply ***** ** *** ** **** ** ** ** ****, if *** **** **** *** ****, *** **** ***** *********** of *** ******** ********** ** *** ***** ****** ***** ***** then *********. ** **** ******** ********* ** *** ********** ****** the ****** **** ** ***** ******* **** *** ******** ***** side (***/**** **), ******* **** ******** ** * **** ******** circuit ******, **** **** ***** *** **** * ****** ** electrocution.

*** **** ****** *** ***** ** (********* *** *** *******) over **** ********* ** **** ** ***** *** *** ******* to **** ** ** ** **** **** *** ******* (***** a ****** ***********) ** ****** ******, *** ******* *** ******* to *** ******** ** ** ***** ** ******* ** ******** by *** *********. ** ** * *** **** *********** ****** to ***** * *** ******** ** ******* ** * ****** working *******. **** ***** ******* *** *** ** ** ********, a **** ** ***********, ********* *** ********* *******, ****** ******* to *** **********, *** **** ***** **** ******* ******** *** reliability ** *** ******.

* ***** *** ********* *** **** ** *** ********* ***** using ** ** ***** ** ******* **** *** **** ********. I ** **** * ****** ** *** ******* ******** **** camera ***** ** ***** **** ** ***** ******** ******* ** DC. :-)

*******, ** *** *** ********* *** ******* *** ***** @ 3A ******* **** ** **** ***********, * *****, ************* ** a *** **** ************ ** ** ****, *** ***'* *** agree ** ******** ** ** *** ********* **** **** *** a ******** *********? * ***** **** ** ***** ** **** to ** ** *** **** ****. :-)

*** ***** **** * ****** *********, *****... * ****, *'** felt * "*****" ** *'* ******* ** *** ***, ********* on * **** ** *** ****, *** ******* **** ** me ******* *** ******** ******* ********... *** **/*** ***'* ***** to ***** *** **** ***** ****** *************. ***'* ****** **** actually ******* * ****** **** **** * ****** ***** ******, AC ** **.

**** ** **** **** *** ******* ********** ** **** *** skin ** ** *** ***** ** ******** - *** ****** 1meg ** .******. ** **** **** ** ****/******, *** ******* conducts ******* *** ********, **** **** ****.

****: ****, * ******-******** ***** ****** **** *** "****" *** where * ***-***** *** ******'*. ***'* *** ***** *******: ******* flow ** * ****** ** ******* *** **********. ** **** skin *** * * *** **********, ***'** ***** **** *** .0024mA **** *** ******* *** ***** ****** ** ******* ***** or ****.

** **** ******** ** *** *****. *** ***'* **** * thing. ***, * ***'* **** **** ** *****, **** ** volts *** **.

***, ** *** **** ******* ******** ** * ******, ****'* a ******* ********* **** ****. * ******** **** ************ ** an ******* ** *** ****** ******** *** **** ** **** of ****** ** ******* **** **** **** *** ***** ***** wet ***********. *'** ***** ****** ****, *** ***'*. ***** *** electricity ***'* ***.

******* **** ****** ******** ******** ** * ******, ******, ****** your ***** ****** *** **** **** ** ********* ** ** earth ******. *** ****** ** *** *** *** *** ** just ** *** **** *******, **** ******... ***'* ** ******** about ********** **** **** ** ******* *****.

******** **** **** *** **** ****** ***** ****** *** ***** ass-covering, ** ** ******* *** *****'* ********** *** *********** *****.

****, *** **** *** *** ****** ***** ****** **** ********* to ***** ******. * ******* *** ***** **** ********* ** ground.

*****,

****** *** *** *************. *******, * **** ****** **** ****** that **** *** ********** *** * ****** ****.

** * **** ** *** ********* *** ** ** *** missed *********. *** ***** *** ******.

****** *****,

*'* *** ***% **** **** *********** ** ****** *******, ***:

'*********** **********' ****** (***** ******, *** ********, ******* *********, ***) tend ** *** ******* '*******-*****' **********. ******* ********* *** ***** short, *** ********* **** ** * **** ****** ****** ** drop.

*******:

'*********** **********' ****** (****** ******, ****** ********, ****** *********, ***) tend ** ******** ******* ******. ******* ********* *** ** ****, covering ******** ** ****.

***** **** ******** ********* ** ****** *** *******, *** *** cover **** *********, ** *** ** ** * ********* **** area.

******* ** ******* *** *** ************ ***** ***'* *** (* = * * *), ** ***** ***** **** ** **** to ***** ********* ** *** **** *****, ***** ** ****? For *******, **** * *** * ******* ** ***** *****, cut ** ** ****, * ******* * **** ** *** cable, **** *** *** **** *** ***** **** ** ** short-ciruited ** *** *** *** **** *** * ********** ** measure *** ** ********** ** *** ***** *** ** *** cable *** ****** *** ** *** ** ********** ** ******* the ****?

******,

** ****** *** *** *******. ** ********, ** ***** ** better ** ** * *********** *********** *** **** **** **** you *** ***** *** ***** **** *** ***** ****** ***. than ** *** *** **** *** **** ******** **** *** have *** ***** ***** ** **** ** *** ***** ******* power ******. **** *** ***** ** ** **** ********* **** in ***** ** **** ** ******** *** *** *** ** terms ** ***** ******** ** ********* *** ********** **** ** power ****** **** *** ******* ****.

**** *** *****. *** ***** ***** *** **** **** * almost **** **** $$$ **** ** ** ******. :-). ****! I **** * *** ******** ** ** **** *********** ** powering ** ****** ******, **** * ** ** *** **'* and ******* **'*. ****** ** *** *** ******* *** ***** discussion ** **** *********** *****. **....* ** ***** ** *** a **** ******** ****, *** *********** *** ******* ******* **** on *** *******, ** * **** ** ****** ** *** resistance ** ** ** **** **

** ***** *** ******* ******, ** ******* ** *** **** tables **** *** *** *****. **** *** *** ****** **** I **** ****, *** ***** ** *.** **** *** **** ft *** ** ***** **** ** ******* *** * ****** run ****, *** *** **** **** ** ** ** *** the ***** ********** *** *** ******** ***. *** **** (*.** ohms *** **** ** *** ** *** ****) ** * reference ***** ** ***** *** *** ********** ***** *** ****** that *** **** ** *** *** *** ****** *** ** wrong. ****** ******** **** ***** *** ** ***** ********** ** the ***** (*.** ****) **** *** ************ ** *******.

***** ******* *****'* *********** ** *** ******** ***** *** ****** of ** *** **********, * ** ***** **** ** *** bush, ** * **** ** ****? :-) **, ****** ** is **** **** *** **** ** ****** ** *** ********** of *** **** ** **** *********** *****. ****, ***** **** be * ******* ***** **********, *** ******* **** **** ***** at *** *** ***/**** ** *** ****** (******* ********) ** the **** (***, **** ******, **** ******), *** *** ******* drop **** ***** ** *** **** ******, *** *** ***/**** voltage **** **** ***** ** *** ****** (******* ********) **** the **** **** ** *** ******* ****** (***** ****** ****):-)

*** ******: ***. ************* *** ********** **** ** ** *******.

**** ****** ****** ****, ***** ****** ** *** ******* **** double *** ***** ** *** ********** *******.*** *** ******* **** ** *** ****, *** ********** ****** either **** ** ** '*************', ** ******* *** *** ****** ***.

******* ** ****** *** ***** *****, **** ** **** ** yourself *** *** *** ** * ****** ** ****** ***********...**** **** *** (******* ******* *** ******* ** *** *** :), ****** ***, ** ** ***'** ******* ************ **** ***** (****** **** UTP, *** *******), * ******** *** *****.

******,

******* ** ** ******* ***********, ** *** ** ***** ** just ****** **** *** ********** ** **** **** *** ****** is **** *** * ****** ***, *** ****** *** ***** for *** ******** *** *** ** *****. ** ***** *** would **** **** * ******* ****** ****** *** ******** ************* lower *****, **** ** *** *** ***** *** **** ***** later *** **** *** ** ******* *** **** ***/** *** power ******. ****** ****** ** *** ** *** **** ****.

***** ***** *******... *** *** **** ***** *** ***** **** vs ******** *** ** ******** ********** ** ********? ** ** what *** *** ************* ** ***** ** *** **** ******** extenders *** *** ********* ***** (*** ***)...

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