Hello, i`m looking for a nut-compatible low-power UPS (need to hook a home-server+dsl equipment with a load of ~50W to that) which should be as energy efficient as possible and be also affordable. i currently have an older powerwalker which constantly burns ~15W for nothing. The transformer inside getting that hot that you don`t like to touch it and i think 15W out of 50 is a little bit high and that inside a plastic case looks a little bit dangerous to me, too. since this ups is old anyway, i`d like to replace it with a better one. i have contacted several vendors and they could either not give accurate information or they gave information like "our UPS is 100% efficient in AC-AC mode" (Digitus DN-170020), which i cannot believe to be true, as an UPS is a electrical device which always consumes power for itself. so, this is not a very nut specific question, but i have no idea where this question is better placed, as i think HERE are the real UPS experts :) thanks roland ______________________________________________________________________ Haiti-Nothilfe! Helfen Sie per SMS: Sende UIHAITI an die Nummer 81190. Von 5 Euro je SMS (zzgl. SMS-Geb?hr) gehen 4,83 Euro an UNICEF.
Le dimanche 24 janvier 2010, devzero at web.de a ?crit :> > so, this is not a very nut specific question, but i have no idea where this > question is better placed, as i think HERE are the real UPS experts :)Cannot tell for all UPSes and I'm no expert, but an online (double-conversion) UPS should eat quite a lot power for itself, where an offline or line- interactive UPS should only eat, when AC is present, what's necessary for the battery charger part to charge the battery and maintain it charged periodically - plus what the UPS uses for its own driving logic. I've bought past week an EATON Ellipse Max 600 which is line-interactive, and I just purchased yesterday a plug with an LCD display that displays instant and cumulated power drawn from the plug. I've connected my Ellipse Max 600 UPS thru it so the plug displays on its LCD the overall power drawn by the UPS and everything connected to it. According to the plug's manual, it's supposedly accurate enough to display every eaten Watt. To answer your question I just turned off every equipment connected to the UPS, only letting the UPS itself powered and powering its outlets. The counter LCD plug then displays "Zero Watt" drawn. But the UPS battery is currently 100% charged. It surely uses some power to maintain it charged from time to time... Also the UPS case doesn't emit any noticeable heat or doesn't get even warm when running on AC power, so at least I can say there's surely not much power being lost into heat... -- Michel Bouissou <michel at bouissou.net> OpenPGP ID 0xEB04D09C Et si au dernier chapitre nous d?couvrions que la solution n'existe pas ? -- Hubert Reeves
Svein Skogen (Listmail Account)
2010-Jan-24 14:06 UTC
[Nut-upsuser] Energy efficient UPS - anybody?
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 24.01.2010 13:51, devzero at web.de wrote:> Hello, > > i`m looking for a nut-compatible low-power UPS (need to hook a home-server+dsl equipment with a load of ~50W to that) which should be as energy efficient as possible and be also affordable. > > i currently have an older powerwalker which constantly burns ~15W for nothing. The transformer inside getting that hot that you don`t like to touch it and i think 15W out of 50 is a little bit high and that inside a plastic case looks a little bit dangerous to me, too. since this ups is old anyway, i`d like to replace it with a better one. > > i have contacted several vendors and they could either not give accurate information or they gave information like "our UPS is 100% efficient in AC-AC mode" (Digitus DN-170020), which i cannot believe to be true, as an UPS is a electrical device which always consumes power for itself. > > so, this is not a very nut specific question, but i have no idea where this question is better placed, as i think HERE are the real UPS experts :) >While I'm no expert on the subject, I'm quite pleased with my CyberPower "Intelligent Series" 1500LCD. That's a line-interactive job, that currently powers two ITX-based servers, a 24port gigabit switch and my 3640 router with no problems whatsoever. Statistics from the ups can be found at https://statistics.stillbilde.net/ups/ //Svein - -- - --------+-------------------+------------------------------- /"\ |Svein Skogen | svein at d80.iso100.no \ / |Solberg ?stli 9 | PGP Key: 0xE5E76831 X |2020 Skedsmokorset | svein at jernhuset.no / \ |Norway | PGP Key: 0xCE96CE13 | | svein at stillbilde.net ascii | | PGP Key: 0x58CD33B6 ribbon |System Admin | svein-listmail at stillbilde.net Campaign|stillbilde.net | PGP Key: 0x22D494A4 +-------------------+------------------------------- |msn messenger: | Mobile Phone: +47 907 03 575 |svein at jernhuset.no | RIPE handle: SS16503-RIPE - --------+-------------------+------------------------------- If you really are in a hurry, mail me at svein-mobile at stillbilde.net This mailbox goes directly to my cellphone and is checked even when I'm not in front of my computer. - ------------------------------------------------------------ Picture Gallery: https://gallery.stillbilde.net/v/svein/ - ------------------------------------------------------------ -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.12 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAktcU/EACgkQODUnwSLUlKQifwCfcgXx4rf6SWt5eJ1KcgXlKGJb V1MAoI/ceLFNVs4FR18ZWheDANHjS2AP =o111 -----END PGP SIGNATURE-----
Citeren devzero op web.de:> i currently have an older powerwalker which constantly burns ~15W > for nothing. The transformer inside getting that hot that you don`t > like to touch it and i think 15W out of 50 is a little bit high and > that inside a plastic case looks a little bit dangerous to me, too. > since this ups is old anyway, i`d like to replace it with a better > one.This kind of zero load power is typical for low frequency (LF) UPS designs that use the inverter transformer for charging the batteries and to power the monitoring circuit. Usually, you'd expect about 2-5% core/iron losses of the nominal power rating of a small transformer. So for a 500VA UPS (transformer), a no-load loss of 10-25W will be typical. You'll only find this kind of topology in cost sensitive (consumer) devices up to about 1000VA, where wholesale price is more important than efficiency. [...]> so, this is not a very nut specific question, but i have no idea > where this question is better placed, as i think HERE are the real > UPS experts :)You should look for a small standby or line-interactive UPS using a high frequency (HF) inverter. For small UPS devices this is the most power efficient topology and usually meets the requirements for SOHO applications. The Eaton Ellipse ASR or MAX series would be a good choice, since they are one of the few vendors that actually support NUT. I'm not sure about their Protection Station series, but it probably also uses HF technology too. Best regards, Arjen -- Please keep list traffic on the list