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 Post subject: Re: Advice on UPS backup power supply - DVR & 8 cameras
PostPosted: Thu Apr 19, 2012 1:59 pm 
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Been a while, but thought I'd report back. Went to a store specialising in CCTV systems and They have the following UPS:
http://www.argseguridad.com/producto_detalle.php?id=459
With 1 x 4A output, 4 x 1A outputs and claims to run for 5 hours.

The cameras were about 0.5A so I imagine I could connect 2 to each 1A output. The price is equivalent to 200 US or 130 pounds.

They recommended coaxial cable with power cables incorporated, and said using passive baluns that the cables could stretch up to 100m without losing too much signal.

The standalone linux system they have powers up automatically on hard shutdown.


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 Post subject: Re: Advice on UPS backup power supply - DVR & 8 cameras
PostPosted: Mon Apr 23, 2012 10:33 pm 
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weeboludo wrote:
Soundy wrote:
shockwave199 wrote:
My dvr doesn't like a hard shut down at all, so when there's an outage I can do a soft shut down, in which case having the monitor to see that bit of navigation is helpful.

If it's a Windows-base DVR, you can install the UPS software that will monitor the UPS status and initiate a proper shutdown automatically when the power gets low.


The idea was a standalone Linux based DVR, running without monitor. There will be power outages, and they will drain the battery completely and there will be noone around to reset it. So .. I'll be wanting somehting with BIOS wake ... wake-on-lan or something.

I'm fairly handy with Linux, so as long as it will wake up and connect to the internet I am happy entering the system myself by SSH and fixing anything by hand. So either wake-on-lan or some BIOS setting. Though maybe I might have to build a system myself rather than buy a standalone (later I'll maybe ask you all for opinions on the models available here to see if you have experiences)

Cheers



they wake on ac resume on most stander bios


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 Post subject: Re: Advice on UPS backup power supply - DVR & 8 cameras
PostPosted: Mon Apr 23, 2012 10:41 pm 
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weeboludo wrote:
They recommended coaxial cable with power cables incorporated, and said using passive baluns that the cables could stretch up to 100m without losing too much signal.

They misspoke - 1000m would be more accurate.

Quote:
The standalone linux system they have powers up automatically on hard shutdown.

*ALL* PCs are capable of this - it's a BIOS option, independent of the OS.

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 Post subject: Re: Advice on UPS backup power supply - DVR & 8 cameras
PostPosted: Thu May 03, 2012 1:50 am 
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I don't have any knowledge about the calculation of circuit, but anyways you are doing a good job for your friend, all the best.


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 Post subject: Re: Advice on UPS backup power supply - DVR & 8 cameras
PostPosted: Tue Mar 11, 2014 8:07 am 
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Hi, you could try going to the following as they seems to know what I needed when i wanted to buy a cctv system for my house



Hope it helps ;-)

http://www.upscentre.com/index.php?route=product/category&path=62


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 Post subject: Re: Advice on UPS backup power supply - DVR & 8 cameras
PostPosted: Tue Oct 31, 2017 10:15 pm 
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The problem with a hard shut down is the MBR on the hard drive

The MBR is constantly updated as the data on the hard drive is updated and if someone is unlucky and the hard drive is powered down during an update of the MBR it "can" not only corrupt the data on the hard drive but in rare instances brick the hard drive

With this in mind I find it quite appalling that DVR manufacturers, especially larger ones like hikvision, Dahua, Samsung and so on haven't built in a Linux interface for standard UPS makes such as APC

As for a UPS, they tend to have two values, one is their watt/hour value which is the same as a batterys AH value, how much "power" it can store and a second which is its maximum load current

So you could have a 2kw UPC which can only provide a maximum of 500watts, but would supply that amount for "around" 4 hours or alternatively one that is a 2kw UPS that can supply 2kw for 1 hour. So you need to figure out what the value actually is

Many APC models state their "capacity" not their maximum load which is often quite a bit less than their capacity

But also bear in mind that even if a UPS has 2kw capacity you wont get that full capacity. Partly due to losses in the conversion process and partly because the batteries will reach the lowest voltage that the circuitry can effectively step up to 240v but some of the 2000 watts will still be in the battery as well as bearing in mind that any value stated is only the capacity when brand new, over time the capacity of the batteries, what voltage they charge to and how quickly their voltage drops will all change.

So a UPS that is a couple of years old might have a significantly lessened capacity compared to when it was new, so choosing a UPS that allows you to change the batteries (or battery packs) yourself is always the best way to go rather than sealed units that aren't owner serviceable

Most APC models either take standard batteries or have a simple lead/connector arrangement you can prise off and stick onto new batteries so I have tended to use APC models partly because of that and partly because their collect and return warranty service is handy as posting a faulty UPS back to the manufacturer is quite expensive and not all manufacturers will cover that cost


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 Post subject: Re: Advice on UPS backup power supply - DVR & 8 cameras
PostPosted: Mon Jan 29, 2018 10:20 pm 
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UPS labels will always state KVA and KW and they will be slightly different.

UPS are usually marketed in their KVA rating however

The KW rating (which accounts for losses ie power factor) will be the one to use for your loading requirements.

Typically small UPS have PF at 0.8 though can range from 0.6 to unity. So a 1kva UPS with PF of 0.8 will have a maximum load capacity of 800w (0.8Kw)

Battery AH is the rating that the battery should be able to continuously supply exactly for 1 hour - Which doesn't mean or help most that purchase UPS

UPS will usually state the full load runtime of the UPS on batteries, which Typically on a small UPS is usually all that is required

Often UPS are specified by consultants, which in reality means we calculate the battery requirements for a specified runtime at a specified load. If this runtime is to be required at end of life of battery, the industry standard is to add on another 20% for battery deterioration.

Hope this helps :0)


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