General > General Technical Chat

12V DC UPS

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Alex Eisenhut:
So the battery died on my very small home UPS that I used for the modem and router. I used it to give me maybe 5-10 minutes of connectivity to save stuff in case of power failure.

The thought occurred that it's quite silly to have this DC->chop to AC->wall wart chain just to have 12V for the modem.

So there are 12V mini-UPS things on Alix... Any good? Experiences? Thoughts?

It's the same price as trying to track down a new 12V gel cell for my UPS, so...

 :-//

https://www.aliexpress.com/item/1005004107179526.html

NiHaoMike:
Just get a 3S pack with BMS and connect it to the 12V bus using a Schottky diode and resistor, or directly if the DC supply is current limited to within the charge current limit of the battery. It turns out that 12V yields 4V/cell for 3S, which is OK to leave connected indefinitely.

Ed.Kloonk:
Under the mountain of paperwork on my desk there should be an envelope on which I've drafted a plan to build usb powerbank with power pass through and a 5v->12v boost converter module for the router/firewall in the garage in case of power failure.

I don't doubt it would work, I just haven't got around to doing it.


Cos I'm so lazy, I ended up just buying a 7Ah gel cell and put it in this:
https://www.altronics.com.au/p/m8561-12v-dc-ups-battery-backup-power-supply/

That was about 7 years ago. Still works OK as of two nights ago when our power got knocked out by some trees.

Alex Eisenhut:
For the price of the Alix thing I'm not motivated in the slightest to kludge something together. I just had this feeling that the clunky, chunky, and heavy lead-acid inverter UPSs, with their tiny battery life and at the same time six or eight AC outlets for 150$ CDN, just make no sense. I still can't really believe they're actively sold.

So I ordered the Alix thing.  8)

Ed.Kloonk:

--- Quote from: Alex Eisenhut on July 23, 2022, 05:06:30 am ---For the price of the Alix thing I'm not motivated in the slightest to kludge something together. I just had this feeling that the clunky, chunky, and heavy lead-acid inverter UPSs, with their tiny battery life and at the same time six or eight AC outlets for 150$ CDN, just make no sense. I still can't really believe they're actively sold.

--- End quote ---

WRT the lead-acid consumer UPS, not sure about your locale but here there was a push some years ago among the office supply big stores to shove these things down everyone's throats. And yeah, you're right. They're shit. I have a fine collection of dead soldiers.


--- Quote ---So I ordered the Alix thing.  8)

--- End quote ---

I like the wide input voltage range. Again, locale. I'd need to be watching the package heat during summer time.

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