12V DC-DC converters with UPS function.

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sajunky

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Purpose of this thread is to provide solutions for powering ADSL/3G WiFi routers or low power media streaming devices during blackout hours. Standard PC UPS is not designed for long time backup (if it does, it will cost fortune), is inefficient and frequently it will switch off after few minutes automatically under light load.

We need stable 12V (10W to 30W) power source. The most efficient way is to use 12V DC-DC converters to power up such devices (instead of generating 240V sine wave imitation). There are such devices designed for alarm systems which also have typical UPS function (lead-acid battery charge/discharge control). Example is here:
http://www.mantech.co.za/ProductInfo.aspx?Item=372M0705

If you know other devices available locally, post in this thread. We also need plugs to provide alternative wiring, clams (for car battery) links are welcome.
 
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sajunky said:
Purpose of this thread is to provide solutions for powering ADSL/3G WiFi routers or low power media streaming devices during blackout hours. Standard PC UPS is not designed for long time backup (if it does, it will cost fortune), is inefficient and frequently it will switch off after few minutes automatically under light load.

We need stable 12V (10W to 30W) power source. The most efficient way is to use 12V DC-DC converters to power up such devices (instead of generating 240V sine wave imitation). There are such devices designed for alarm systems which also have typical UPS function (lead-acid battery charge/discharge control). Example is here:
http://www.mantech.co.za/ProductInfo.aspx?Item=372M0705

If you know other devices available locally, post in this thread. We also need plugs to provide alternative wiring, clams (for car battery) links are welcome.
Click to expand...

I'm not sure I understand. If you need a stable 12V DC power source then just connect directly to a 12V deep cycle battery.
 
Still using this to power my ADSL and a few lights - including my biltong box at times. :)

IMG_5459.jpg
 
deweyzeph said:
I'm not sure I understand. If you need a stable 12V DC power source then just connect directly to a 12V deep cycle battery.
Click to expand...
How stable it is? It changes between 15V (when fast charging), 13.75V (on trickle charging) and you want to cut off when battery voltage drops below 10.6V. Battery will not rest for long if you allow it happen. So you need full battery charge/discharge control. And you must remember that some devices do require voltage with tighter tolerance than above. Do you want to take a risk and connect R2K router?
 
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