Usually a spinning disk need about 1amp at 12v to spin up each disk. I have had to upsize a power supply because the original ps was no longer quit big enough after the disks had aged and increased startup current closer to the max specified for the disk. Max x disks was a few amps over the ps rating, but worked when the disks were new.
If your 3kva ups shuts off on a 1.2kva load that means it has a battery with at least one dead cell in it. If multiple new batteries are in it you need a load tester to put a load on the batteries and see which one has a low voltage. I have had to do that on a 7.5kva/4×12v system and at idle all 4 batteries voltages look about the same, but under load one battery was about 2v low. My batteries were under 12 month warranty still so i was able to get a new one sent. On Wed, Dec 22, 2021, 2:46 PM George N. White III <gnw...@gmail.com> wrote: > > On Wed, 22 Dec 2021 at 10:36, Tim via users <users@lists.fedoraproject.org> > wrote: > >> On Fri, 2021-12-03 at 10:45 +1030, Tim via users wrote: >> [...] > > It's scary when you see PCs with 500 watt power supplies (or the >> hardware manuals saying you need one), but they don't use 500 watts all >> the time, if at all. It's just their capability. The main idea is >> that a beefy power supply doesn't have any problems when everything >> cold boots. Probably the only thing that's really going to cause the >> average user's PC to use a lot of power is gaming with fancy on-the-fly >> graphics rendering. >> > > Spinning up a bunch of rotating media disks can be a problem booting. Even > if the server has a big power supply, your UPS may not handle the load. I > used > get around that by booting from a small disk and manually mounting the RAID > array. Newer disks do use a fraction of the power of older models. but > lower prices just mean people stuff boxes with as many drives as it can > hold. Maybe current systems are smarter about staging drive startup. > > It isn't only gaming that that is power hungry -- vendors have to consider > a > range of use cases. My group at work once got the loan of a high-end Dell > workstation that had been used as a node in a large numerical model. On > boot the system immediately started heavy numerical processing and > the 1.4 KVA UPS cut it off. The manual said it needed 1200 VA power. > Fortunately we had a 3KVA UPS originally used for deskside SGI > "mini-super" > system. > > > -- > George N. White III > > _______________________________________________ > users mailing list -- users@lists.fedoraproject.org > To unsubscribe send an email to users-le...@lists.fedoraproject.org > Fedora Code of Conduct: > https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: > https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org > Do not reply to spam on the list, report it: > https://pagure.io/fedora-infrastructure >
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