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439 posts

Ultimate Geek
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Topic # 154359 25-Oct-2014 15:14
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looking at making a sorta DC UPS for my router by having it powered from the alarm battery that gets charged by the alarm (arrowhead elite S) with a bigger backup battery, that way in case of power outage the router will stay up.
  Any thoughts??

if not anyone know of a cheap DCDC UPS that will charge/maintain a car battery for instance to power the router and maybe some emergency lights?? i remember seeing a thread a while back possible about arduino DCUPS that had a link but ti cant find it now??

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8995 posts

Uber Geek
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  Reply # 1162017 25-Oct-2014 15:41
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I can't claim special expertise but I have done things like this in the past and it sounds to me like it should work. A battery is a battery and a charger is a charger as long as you don't do stupid things. If you increase the capacity of the alarm battery it ought to eventually fully charge, it just takes longer. Of course you want to use the same type, just bigger. However, since this is an alarm, it might be better to keep things separate. I do everything on a budget and would probably just get an old car battery (sealed) and a trickle charger. The battery acts as a buffer and a trickle charger is like your alarm charger, low enough current that it can't hurt anything if you just let it run all the time so you don't have to mess with voltage regulators and that kind of thing. Another option is a cheap battery booster, which is essentially the same thing. Just leave the charger plugged in. Repco often sells 400 amp units for around $40 or so. Don't forget fuses and a smoke alarm.



I reject your reality and substitute my own. - Adam Savage

14371 posts

Uber Geek
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  Reply # 1162043 25-Oct-2014 17:40
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Have a look at this thread - there may be another thread too, not sure. Do you want a UPS or do you just want the ability to plug it into a battery? I don't think I want a UPS, because then if the battery's small and I'm not home when a disaster hits the battery could be completely run down before I get home. Switchable would be ideal.

The battery is probably 12V, which should be fine to run the UPS.

Stuff from this site may be useful.

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