3 ms·

I don't need days of power, but I wanted a few hours. I ended up getting a Belkin Battery Backup REV B, BU3DC001-12V off of ebay and modified the barrel connect

I don't need days of power, but I wanted a few hours. I ended up getting a Belkin Battery Backup REV B, BU3DC001-12V off of ebay and modified the barrel connector to fit my cable modem and router. I can get at least 3 hours (I haven't tested it longer than that). I'll probably get another while they're still available. As for my server, I have it on a UPS big enough to allow it to shut down (with some slack for battery degradation). That's all I really need.

bob1029 6y ago
If you want to run a handful of low current DC devices for an eternity and in a rock-solid manner, just get a DC-DC converter for each and a few batteries+charger. You can keep the devices permanently looped in on the battery while it is on trickle charge. Think of it as a car's electrical system in your network cabinet, replacing the alternator with grid power. If we are just talking about cable modem + wifi router + NAS, you cant be looking at more than 30 watts. Buck/boost DC-DC converters are upwards of 98% efficient, so you don't have a bunch of losses with that extraneous inverter/rectifier stage. All of this stuff can be purchased and assembled with minimal fuss.
- HumblyTossed 6y ago
  That's why I went with the Belkin, it isn't a "normal" UPS. 120V comes in and is stepped down to 12V, but there's no up-conversion the other way; the output is 12V (up to 3A) to a barrel connector. I bought a Y so I could energize my two devices (after making sure combined they don't exceed 3A).