12v power supply units for cameras

i=p/u · Jun 10, 2022

12v 5A power supply for four cameras, if using shotgun cable with the power cores being 0.15mm, what is max distance from the cameras the power supply can be, as these are normally mounted close to camera itself. I know I can power locally to camera but would prefer to keep it all together. Any help thx T

Electro-tech · Jun 10, 2022

Depends what cameras you are using, are you talking old coax Analoque or cat 5 digital. I think 100metres max would be okay. I have used cat 5 twisted pairs for power & video. You will need video baluns at each end to convert .

DPG · Jun 10, 2022

Electro-tech said:
Depends what cameras you are using, are you talking old coax Analoque or cat 5 digital. I think 100metres max would be okay. I have used cat 5 twisted pairs for power & video. You will need video baluns at each end to convert .

I reckon there would be considerable volt drop over 100M. Uess the camera is very very low power consumption.

i=p/u · Jun 10, 2022

Its 4 channel analogue DVR, 400mA cameras x 4

I have shotgun cable and camera distance is about 15m to furthest camera.

I want to buy multi power supply unit, which was hoping to mount beside dvr itself rather than local to cameras..

But when I look at the shotgun cable the power conductors are thin 0.15mm.

So am wondering if the psu will loose voltage over the 15m run or does it stay constant

[ElectriciansForums.net] 12v power supply units for cameras

i=p/u · Jun 10, 2022

As we all know ip cameras be best way forward but I've had this kit laying in cupboard for a while

Lucien Nunes · Jun 10, 2022

According to that label on the drum the power cores are 12 strands of 0.15mm diameter which equates to 0.21 sqmm. This will give about 0.18V drop per amp per metre run.
At 400mA per camera that's 0.071 V/m or 1.06V for the 15m run.
If you launch at 12V and the cameras are OK at 10.9V you're in. What is the camera spec? If it allows up to 13.8V as some 12V equipment does, can you launch at the higher voltage?

SparkySy · Jun 10, 2022

I think the 100m max on cat 5 is for video signal although I've had a run of 120m before and it still worked, not tried power at that distance always picked it up locally.

To the op,
I have a camera wired in shotgun cable on one of our sheds about 30m ish away this is fed from a 5a 12v supply and has been fine for 10 years, I think 15m will be fine!
Sy

i=p/u · Jun 10, 2022

It's a solid core, looks pretty much same as a cat/data cable size.. cameras are definitely 12v. It doesnt mention +- on the voltage.

i=p/u · Jun 10, 2022

SparkySy said:
I think the 100m max on cat 5 is for video signal although I've had a run of 120m before and it still worked, not tried power at that distance always picked it up locally.

To the op,
I have a camera wired in shotgun cable on one of our sheds about 30m ish away this is fed from a 5a 12v supply and has been fine for 10 years, I think 15m will be fine!
Sy

You can get that shotgun with 1mm cable also, maybe you have that, as said looks like a data core size

SparkySy · Jun 10, 2022

It may possibly be 1mm, I will have a look have to get up there to clean the d@mn cobwebs off them over the weekend!
Sy

i=p/u · Jun 10, 2022

Just pulled a bit of insulation off and it is strands as you say lucien.

DPG · Jun 10, 2022

In my limited experience 10M will be fine, but anything over I would definitely test it first.

i=p/u · Jun 10, 2022

DPG said:
In my limited experience 10M will be fine, but anything over I would definitely test it first.

I fitted cameras for a while years ago, and my thoughts were 10M, but we always fitted local to camera and sometimes used two core flex.

Similar to led drivers 5m .75, 10m 1.0mm, 15m 1.5mm etc

Lucien Nunes · Jun 10, 2022

In practice you will probably get less drop at the furthest camera because all the camera grounds will be interconnected by the video cable screens which (if it is decent cable) will be of a much lower resistance than the black core of the power pair. Even if the recorder ground is not connected to the PSU ground, some current from the furthest cameras will tend to pass through it, back to the nearest cameras, and to the 12V PSU through the power leads from those. I.e. the half of the drops contributed by the black leads will tend to average out between the cameras.

SparkySy · Jun 11, 2022

Stolen from another site and not verified, but I think looking at their figures then 0.21sqmm over 15m should be ok!

12v power supply units for cameras

i=p/u

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Electro-tech

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DPG

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i=p/u

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i=p/u

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Lucien Nunes

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SparkySy

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i=p/u

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i=p/u

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SparkySy

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i=p/u

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DPG

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i=p/u

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Lucien Nunes

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SparkySy

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