Ringo4422
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theimmc wrote:You can use a UPS. Then you don't have to worry about how to cut over from mains to battery when power goes out.
A UPS would be pointless. The guy suggesting a car battery was much closer to what you would want to do. Unless you spend a buttload of money on a huge capacity UPS which will still only run for under an hour, a 12v deep cycle marine is the only way to go, and for a fraction of the price of a UPS. It can be paralleled with with the power supply to maintain the battery charge, but suggest an isolation diode and .5 ohm resistor to prevent overload to the power supply when the battery becomes exhausted. It will run for hours and hours without AC power.
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Ringo4422
quality posts: 19
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tirk wrote:I was about to order one then saw this:
DVR-H8114UV DVR (HD is not included)
No Hard drive? Is that correct?
isnt a 500gb standard in these systems? How the hell do you record.
LOL!!
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Caffeineismydrug
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Ringo4422 wrote:A UPS would be pointless. The guy suggesting a car battery was much closer to what you would want to do. Unless you spend a buttload of money on a huge capacity UPS ...
A standard UPS would work fine; Even a cheapo 600VA unit should run for several hours.
The main switching adapter is 12V 3A; The wall-wort for the cameras is 12V 1.5A; Total power is 54W max, but probably less than 30W average.
A cheapo ups will have a 12V 7AH battery (84W-Hr, less some nominal conversion losses)
Don't forget to allow 10-20W for an old LCD monitor; And, if you want it to maintain network connectivity, you'll also need to backup your internet, network hub/switch, etc.
Running directly off a car/marine battery might work, but they used switching power supplies for a reason, the unit (and cameras) may like the nice, filtered 12V power supply. A lead acid battery sitting at 13.8-14.4V with some form of crude charger attached might be a little harsh for the cheap electronics.
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Ringo4422
quality posts: 19
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Caffeineismydrug wrote:Don't forget to allow 10-20W for an old LCD monitor; And, if you want it to maintain network connectivity, you'll also need to backup your internet, network hub/switch, etc.
Running directly off a car/marine battery might work, but they used switching power supplies for a reason, the unit (and cameras) may like the nice, filtered 12V power supply. A lead acid battery sitting at 13.8-14.4V with some form of crude charger attached might be a little harsh for the cheap electronics.
I did this for a living up until a few years ago and feel I pretty much know everything on this subject. This is a toy but it will get the job done cheaply. Very low res cameras, 30/15fps recorder, no motion detection, consumer entry level stuff.
Nothing is cleaner than battery power. Switching supplies that come with this are noisy crappy power sources, but they are cheap and they work well on cheap equipment.
I agree that a UPS is necessary to maintain internet connectivity, but that's it. Who cares if the monitor is working when the power is off anyway. It's a survielllance system to capture intruders, etc.
Look up Geovision on Google for real stuff.
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