<html><p><br><br><br><br>On Sunday, December 01, 2024 05:58 AEST, Dan Langille via Nut-upsuser <nut-upsuser@alioth-lists.debian.net> wrote:<br><br> </p><blockquote type="cite" cite="e9898733-e4bf-4a39-825d-96d999575417@app.fastmail.com"><p>On Fri, Nov 29, 2024, at 3:35 PM, Dan Langille via Nut-upsuser wrote:<br>> On Wed, Nov 27, 2024, at 10:56 AM, Greg Troxel via Nut-upsuser wrote:<br>>> Dan Langille via Nut-upsuser <nut-upsuser@alioth-lists.debian.net><br>>> writes:<br>>><br>>>>> On the website, they say 5.73 pounds (5 lbs 11.6 oz).<br>>>>><br>>>>> Two of the batteries were 5 lbs 11 oz. The rest were all 10, 9, or 8 oz.<br>>>>><br>>>>> See my bar chart at https://bsd.network/web/@dvl/113555334752647203<br>>>><br>>>> The batteries are all within 3% of the expected weight. Seems good enough for me.<br>>>><br>>>> I gave some thought as to how to distribute those 16x batteries within the UPS (4x) and the external battery unit (12x).<br>>>><br>>>> In the following, I'm omitting the 5lb part of the weight and mention only the ounces.<br>>>><br>>>> Not that I think it will make much difference, but I'll put all the four equal batteries into the UPS (4x 10oz batteries).<br>>>><br>>>> That will leave the following for the external pack:<br>>>> '<br>>>> * 2 x 11<br>>>> * 1 x 10<br>>>> * 7 x 9 <br>>>> * 2 x 8<br>>>><br>>>> The other choice I'd make: put 2 x 11 and 2 x 10 in the UPS, leaving the external battery<br>>>> unit with:<br>>>><br>>>> * 3 x 10<br>>>> * 7 x 9 <br>>>> * 2 x 8<br>>>><br>>>> I don't know enough to know if this matters and I expect I'm merely overthinking this.<br>>><br>>> You are definitely overthinking it :-) Perhaps you've previously been<br>>> diagnosed as a nerd!<br>><br>> Possibly. I also have a rain-barrel project underway, and I know I'm <br>> overthinking that one too.<br>><br>>> But, I would either put the 4 strongest in the UPS, or the 4 weakest,<br>>> making the external pack better, since it is more important.<br>>><br>>> I would suggest that you get a West Mountain CBA, if you want to<br>>> continue to overthink this. We are assuming that more lead is more<br>>> capacity, but there are also weak cells, not clearly related to missing<br>>> lead. What really matters, IMHO, is how many Ah one can pull out of<br>>> the battery, and measuring that directly seems more direct.<br>><br>> I understand, and no, I'm done with this stage of the process. I don't want<br>> to geek out any further.<br>><br>> So far, every battery has been charged. Each took about 30 minutes. When charged<br>> they measured about 13.3-13.5V. The first batteries I charged are now at about<br>> 12.9-13.1V - one was 12.8V<br>><br>> They're sitting in a room that is about 63F.<br>><br>> My next step is to pull the main battery from the 5PX and replace those <br>> units. However,<br>> it's 3:30 PM and I'd rather start such a project earlier in the day <br>> should<br>> thing take longer than expected. <br>><br>> One server has a drive ready to be replaced and two drives are to be<br>> relocated from the drive bays at the front to PCI slots in the rear of <br>> the server.<br>> That process is waiting on parts. I was going to wait for those parts <br>> and do the drives<br>> and batteries at the same time. I changed my mind; I'm not going to <br>> wait. Plus,<br>> the batteries may be a big enough job by themselves. I am sure the <br>> Eaton 5PX legacy<br>> is not a hot-swappable unit. I'll power everything down.<br>><br>>> Thanks for posting about your journey; it has been illuminating to me.<br>><br>> I'm glad it helps. I write mostly for selfish reasons and encourage <br>> others to do so<br>> too. It helps to know what you did should something go wrong and/or you <br>> want<br>> to repeat the procedure later. If you make your writing public it will <br>> also<br>> help others and I'm thankful of that.<br><br>The batteries were replace earlier today. Details with photos in the this blog post:<br><br>https://dan.langille.org/2024/11/30/replacing-batteries-eaton-5px-5px2200rt-5pxebm48rt/<br><br>Some tricky bits, especially a metal nut very close to the fuses... A slice of cardboard<br>helped me through that part.<br><br>BONUS: I ordered four more batteries than I needed (12). This means the UPS in the office,<br>which I'm sure will start screaming for new batteries soon, has a supply already on hand.<br><br>-- <br>Dan Langille<br>dan@langille.org<br><br>_______________________________________________<br>Nut-upsuser mailing list<br>Nut-upsuser@alioth-lists.debian.net<br>https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsuser<br> </p></blockquote><p>None of the images load for me on that blog - maybe double check that?</p><p>Simon<br>-- <br> </p><div class="raw-html-embed sogo-raw-html-embed">Simon Wilson<br>M: 0400 121 116</div></html>