Comments on: Turn a small home UPS into a giant UPS (video)

By: Sanix

Sanix — Mon, 19 May 2008 06:56:21 +0000

This is really a cool trick. It’s a must for our types of countries where power outage is for hours, not minutes. I’ll try it out with my own UPS.

By: Denis

Denis — Thu, 06 Mar 2008 10:54:11 +0000

You should not charge non-sealed lead acid batteries indoors, as they can give off toxic fumes. This is something your girlfriend will be pissed about, let alone being woken up at 3am in the morning to a beeping UPS.

You should be using sealed lead acid batteries, or AGM batteries, which are designed to be charged safely indoors and do not give off these fumes. These are available from marine stores as they are used for powering electric motors used for trolling.

By: jil

jil — Wed, 05 Mar 2008 14:56:47 +0000

How long does it take to recharge the batteries now using the small UPS? Can it really charge the battery to full potential? Just curious.

By: Per Hansson

Per Hansson — Sun, 02 Mar 2008 08:33:33 +0000

The UPS you mod _must_ have a fan
The limited runtime is calculated so that the inverter does not
overheat, if the inverters heatsinks are not cooled it will
overheat and cause damage to the UPS

Also the same is true for the carging circuit, it might not be able to properly charge 80 amp batteries without overloading itself

It’s better to mod a UPS that it made with external battery packs in mind from the beginning, then you are 100% sure that it will be safe

Oh, and a RAID-0 is never safe, not ever ever ever :D