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p.MsoNormal,p.MsoNoSpacing{margin:0}</style></head><body><div>On Sat, Nov 30, 2024, at 8:55 PM, Dan Langille via Nut-upsuser wrote:<br></div><blockquote type="cite" id="qt" style=""><div><br></div><div>On Sat, Nov 30, 2024, at 8:16 PM, Simon Wilson wrote:<br></div><blockquote type="cite" id="qt-qt" style=""><p><br></p><div><br></div><div><br></div><div><br></div><div><br></div><div>On Sunday, December 01, 2024 05:58 AEST, Dan Langille via Nut-upsuser <nut-upsuser@alioth-lists.debian.net> wrote:<br></div><div><br></div><div> <br></div><p><br></p><blockquote type="cite" cite="e9898733-e4bf-4a39-825d-96d999575417@app.fastmail.com"><p><br></p><div>On Fri, Nov 29, 2024, at 3:35 PM, Dan Langille via Nut-upsuser wrote:<br></div><div>> On Wed, Nov 27, 2024, at 10:56 AM, Greg Troxel via Nut-upsuser wrote:<br></div><div>>> Dan Langille via Nut-upsuser <nut-upsuser@alioth-lists.debian.net><br></div><div>>> writes:<br></div><div>>><br></div><div>>>>> On the website, they say 5.73 pounds (5 lbs 11.6 oz).<br></div><div>>>>><br></div><div>>>>> Two of the batteries were 5 lbs 11 oz. The rest were all 10, 9, or 8 oz.<br></div><div>>>>><br></div><div>>>>> See my bar chart at https://bsd.network/web/@dvl/113555334752647203<br></div><div>>>><br></div><div>>>> The batteries are all within 3% of the expected weight. Seems good enough for me.<br></div><div>>>><br></div><div>>>> I gave some thought as to how to distribute those 16x batteries within the UPS (4x) and the external battery unit (12x).<br></div><div>>>><br></div><div>>>> In the following, I'm omitting the 5lb part of the weight and mention only the ounces.<br></div><div>>>><br></div><div>>>> 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></div><div>>>><br></div><div>>>> That will leave the following for the external pack:<br></div><div>>>> '<br></div><div>>>> * 2 x 11<br></div><div>>>> * 1 x 10<br></div><div>>>> * 7 x 9 <br></div><div>>>> * 2 x 8<br></div><div>>>><br></div><div>>>> The other choice I'd make: put 2 x 11 and 2 x 10 in the UPS, leaving the external battery<br></div><div>>>> unit with:<br></div><div>>>><br></div><div>>>> * 3 x 10<br></div><div>>>> * 7 x 9 <br></div><div>>>> * 2 x 8<br></div><div>>>><br></div><div>>>> I don't know enough to know if this matters and I expect I'm merely overthinking this.<br></div><div>>><br></div><div>>> You are definitely overthinking it :-) Perhaps you've previously been<br></div><div>>> diagnosed as a nerd!<br></div><div>><br></div><div>> Possibly. I also have a rain-barrel project underway, and I know I'm <br></div><div>> overthinking that one too.<br></div><div>><br></div><div>>> But, I would either put the 4 strongest in the UPS, or the 4 weakest,<br></div><div>>> making the external pack better, since it is more important.<br></div><div>>><br></div><div>>> I would suggest that you get a West Mountain CBA, if you want to<br></div><div>>> continue to overthink this. We are assuming that more lead is more<br></div><div>>> capacity, but there are also weak cells, not clearly related to missing<br></div><div>>> lead. What really matters, IMHO, is how many Ah one can pull out of<br></div><div>>> the battery, and measuring that directly seems more direct.<br></div><div>><br></div><div>> I understand, and no, I'm done with this stage of the process. I don't want<br></div><div>> to geek out any further.<br></div><div>><br></div><div>> So far, every battery has been charged. Each took about 30 minutes. When charged<br></div><div>> they measured about 13.3-13.5V. The first batteries I charged are now at about<br></div><div>> 12.9-13.1V - one was 12.8V<br></div><div>><br></div><div>> They're sitting in a room that is about 63F.<br></div><div>><br></div><div>> My next step is to pull the main battery from the 5PX and replace those <br></div><div>> units. However,<br></div><div>> it's 3:30 PM and I'd rather start such a project earlier in the day <br></div><div>> should<br></div><div>> thing take longer than expected. <br></div><div>><br></div><div>> One server has a drive ready to be replaced and two drives are to be<br></div><div>> relocated from the drive bays at the front to PCI slots in the rear of <br></div><div>> the server.<br></div><div>> That process is waiting on parts. I was going to wait for those parts <br></div><div>> and do the drives<br></div><div>> and batteries at the same time. I changed my mind; I'm not going to <br></div><div>> wait. Plus,<br></div><div>> the batteries may be a big enough job by themselves. I am sure the <br></div><div>> Eaton 5PX legacy<br></div><div>> is not a hot-swappable unit. I'll power everything down.<br></div><div>><br></div><div>>> Thanks for posting about your journey; it has been illuminating to me.<br></div><div>><br></div><div>> I'm glad it helps. I write mostly for selfish reasons and encourage <br></div><div>> others to do so<br></div><div>> too. It helps to know what you did should something go wrong and/or you <br></div><div>> want<br></div><div>> to repeat the procedure later. If you make your writing public it will <br></div><div>> also<br></div><div>> help others and I'm thankful of that.<br></div><div><br></div><div>The batteries were replace earlier today. Details with photos in the this blog post:<br></div><div><br></div><div>https://dan.langille.org/2024/11/30/replacing-batteries-eaton-5px-5px2200rt-5pxebm48rt/<br></div><div><br></div><div>Some tricky bits, especially a metal nut very close to the fuses... A slice of cardboard<br></div><div>helped me through that part.<br></div><div><br></div><div>BONUS: I ordered four more batteries than I needed (12). This means the UPS in the office,<br></div><div>which I'm sure will start screaming for new batteries soon, has a supply already on hand.<br></div></blockquote><p>None of the images load for me on that blog - maybe double check that?<br></p></blockquote><div><br></div><div>Oh I see. It's working fine in Safari. I uploaded .heic images, not the .png I exported. I won't be able to fix that until tomorrow. Thanks for letting me know.<br></div><div><br></div></blockquote><div><br></div><div>Fixed. Thank you for letting me now. I appreciate it.</div><div><br></div><div id="sig65064480"><div class="signature">--<br></div><div class="signature"> Dan Langille<br></div><div class="signature"> dan@langille.org<br></div><div class="signature"><br></div></div><div><br></div></body></html>