Hello,

Does anyone have any experiences with GOOD Ubuntu OSes supporting UPSes that can supply 450+ watts of "juice" on a full charge for at least 10 minutes?

If so please also state how much replacing the batter(ies) will runs for as well if all possible.

Thank you in advance.

The two UPS manufactures I have used for home systems is APC and CyberPower. If you really need 450 Watts for 10 minutes according to the APC selector tool (assuming US 120V power) you need a Back-UPS Pro 1500VA. You can get that on Amazon for $170.

I assume that 450 watts is what is listed on your computers power supply. There are calculators on line that will take into consideration your CPU, number of drives, monitor type, etc and estimate the power load which should be less then 450 watts. Using the actual load will allow you to purchase a cheaper UPS.

The Batteries depending on usage should last at least 5 years. Once you pick out a model you can find the battery number and determine its current replacement cost.

1 members found this post helpful.

http://networkupstools.org/ddl/index...ported_devices has some listed.

Kind of hard to judge how much a replacement battery will cost. At work we used to just replace the entire UPS as the battery pack was nearly as much as the UPS was. The price if lead has gone up and may keep going up.

I'd guess most home uses would try to find an online source. Weight is the killer in shipping these but some makers offer replacement as well as shipping back.

Don't forget that some of these UPS's are not "green" and can use a lot of power. Also you may desire advanced features like voltage correction, pfc and true sine.

Thanks I went to http://powersupplycalculator.net/ and found out a maxed out system will ever use ~124 Watts of juice. Even though I would want to account for two systems including a pair of basic monitors a 300 Watts UPS should do me then right?

Not exactly. According to the APC selector 300 watts for 10 minutes requires a Back-UPS Pro 1000. Depends on manufacture but most ratings at full load run times are only about 5 minutes.

That's what doesn't make sense to me...

Why are "Half load runtimes" so much longer than "full load runtimes"??

If I were to find a 300 Watts UPS that says....

15 minutes half load runtime (meaning only using ~150 watts)

Then why would that SAME UPS only rates for 3-5 minutes on an actual 300 watts load? Especially since battery loaded into them just don't "lose" their capacity running at higher loads right??

Yes, they do. The Amp-hour capacity rating for a battery is usually calculated for a 20 hour discharge time, i.e. 20 times the number of Amperes that the battery can supply for that time. Amp-hour capacity at higher dischange rates is substantially reduced, approximately by the 1.2 or 1.3 power of the actual discharge current for the lead-acid batteries typically used in UPSs. See Peukert's Law. And then there is the issue of how the temperature rise in a heavily loaded UPS affects its conversion efficiency.

For a UPS rated for 15 minutes at half load, 5 minutes at full load sounds about right. That's with new batteries. As batteries age, their internal resistance increases, and that has a heavier impact at full load than it does at half load. It doesn't take much resistance to make the voltage drop immediately to the "dischanged" level with full load on the UPS.

So I guess in short... The less power drawn from a battery in a given time the more power it can provide overall (the more efficient it is). If that is so true then why it not easy finding multiple cells? Wouldn't that allows other cell(s) can help "spread the load"? Therefore splitting out more run time overall?

For instance why are even UPSes that are rated up to 900 watts yet have a single battery that can only deliver 10 minutes at half run time (450 watts)? Why not have two batteries delivering up to 450 watts each delivering a half time value 20 minutes (or even longer)? Given a pair of batteries would take a less strain than a single bulky one.

Many of the larger UPSs like the APC model BR1500 I posted above do have an external battery option. The typical role of a UPS for a computer is to provide short term power which the industry seems to have determined to be for the home consumer ~5 minutes.

Interesting, some people do find the need to have a little more time than that. In addition to shutting down finishing using an application, installing, and etc. So it weird that 5 minutes is the "standard".