I found a big 3 kW UPS that was being tossed because the batteries were dead. It ran on 72 volts. six gel cells. I brought it home and bought six deep cycle external lead acids and use it for my house primary backup.
Unfortunately in the 6 years I have had it, we have never lost power for longer than it would take me to go to the base,ent to activate it. I leave it off line since I measured it once and it draws 750 kVa just stting there when there is power. So I only plug it in to charge the batteries when I anticipate a power outage. bob On Sun, May 23, 2021 at 9:16 PM Peri Hartman via EV <[email protected]> wrote: > > Somewhat off topic... > > For some time, I've been meaning to get a small UPS to power my router, > laptop, and other electronics in case of an emergency. Well, our power > will be off monday for utility work and so I bought a small UPS. But, > I'm disappointed with it. > > The spec claims it has 1080 joules, which would be 0.3wh. That's > obviously not true, so I don't know what that number is supposed to > mean. However, its display says it has a load around 60w and that it > should sustain for 96 minutes. That would be around 100wh. I would like > something that can last a day or two, not an hour. (I can turn off my > external display and probably cut the load in half, but still...) > > My thought is to buy a 12v deep cycle battery and hook up a charger, an > inverter, and contactor to switch from wall to battery. I'm pretty sure > there are products which do all that but I haven't found any yet. > > Does anyone have a suggestion ? > > Peri > > << Annoyed by leaf blowers ? https://quietcleanseattle.org/ >> > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20210524/680a7879/attachment.html> > _______________________________________________ > Address messages to [email protected] > No other addresses in TO and CC fields > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > ARCHIVE: http://www.evdl.org/archive/ > LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org _______________________________________________ Address messages to [email protected] No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
