After reading through 20-something posts about 'car/12V/power supply/computer' I've still not found a definitive answer to what I'd like to try here. If this turns out to be a dupe after all, my apologies.
I have this little machine running as a media/file/whatever server in my basement. It's currently (hahaha) being powered by a 65W 12V external 'brick' that came with the box it's mounted in. My (cheapo) kill-a-watt says it uses about 19W, most likely a big part of that are the 2 disks attached to it. Anyway, this works fine but I was wondering if it would be possible to create a 'cheap' UPS for it by 'simply' putting an old car battery in parallel with a PSU (and a 6A fuse).
From my little knowledge I realize that I won't be able to use the 'brick' that's currently powering the setup (need more volt for charging to start with), but I guess I could replace it with a (smallish) car-battery-charger. Going by the technical specifications (see 188.8.131.52 (pdf)) the board allows for an input voltage between 8 and 19 Volts, so I wouldn't be too concerned about things not providing a 'proper' and 'stable' 12V any more.
- Am I simplifying things too much? Should I rather use something else than an (old) car-battery?
- Assuming the charger is of the 'trickle-type', is it (un)likely to be smart enough to see the battery go down over time and then do a 'full' recharge or would that bring me into the 'profe$$ional' kind of equipment?
- And what is my kill-a-watt going to say about this? If this brings my average consumption to like 50W I might just as well rather have the thing crash once a year due to a power-failure.
Alternatively I could go for a sightlier 'more basic' approach and apply the solution found here and make sure my battery is charged "manually/off-line" every once in a while for when it is really needed.
Thanks for any input and remarks!