On Fri, Nov 29, 2024, at 3:35 PM, Dan Langille via Nut-upsuser wrote: > On Wed, Nov 27, 2024, at 10:56 AM, Greg Troxel via Nut-upsuser wrote: >> Dan Langille via Nut-upsuser <[email protected]> >> writes: >> >>>> On the website, they say 5.73 pounds (5 lbs 11.6 oz). >>>> >>>> Two of the batteries were 5 lbs 11 oz. The rest were all 10, 9, or 8 oz. >>>> >>>> See my bar chart at https://bsd.network/web/@dvl/113555334752647203 >>> >>> The batteries are all within 3% of the expected weight. Seems good enough >>> for me. >>> >>> I gave some thought as to how to distribute those 16x batteries within the >>> UPS (4x) and the external battery unit (12x). >>> >>> In the following, I'm omitting the 5lb part of the weight and mention only >>> the ounces. >>> >>> Not that I think it will make much difference, but I'll put all the four >>> equal batteries into the UPS (4x 10oz batteries). >>> >>> That will leave the following for the external pack: >>> ' >>> * 2 x 11 >>> * 1 x 10 >>> * 7 x 9 >>> * 2 x 8 >>> >>> The other choice I'd make: put 2 x 11 and 2 x 10 in the UPS, leaving the >>> external battery >>> unit with: >>> >>> * 3 x 10 >>> * 7 x 9 >>> * 2 x 8 >>> >>> I don't know enough to know if this matters and I expect I'm merely >>> overthinking this. >> >> You are definitely overthinking it :-) Perhaps you've previously been >> diagnosed as a nerd! > > Possibly. I also have a rain-barrel project underway, and I know I'm > overthinking that one too. > >> But, I would either put the 4 strongest in the UPS, or the 4 weakest, >> making the external pack better, since it is more important. >> >> I would suggest that you get a West Mountain CBA, if you want to >> continue to overthink this. We are assuming that more lead is more >> capacity, but there are also weak cells, not clearly related to missing >> lead. What really matters, IMHO, is how many Ah one can pull out of >> the battery, and measuring that directly seems more direct. > > I understand, and no, I'm done with this stage of the process. I don't want > to geek out any further. > > So far, every battery has been charged. Each took about 30 minutes. When > charged > they measured about 13.3-13.5V. The first batteries I charged are now at > about > 12.9-13.1V - one was 12.8V > > They're sitting in a room that is about 63F. > > My next step is to pull the main battery from the 5PX and replace those > units. However, > it's 3:30 PM and I'd rather start such a project earlier in the day > should > thing take longer than expected. > > One server has a drive ready to be replaced and two drives are to be > relocated from the drive bays at the front to PCI slots in the rear of > the server. > That process is waiting on parts. I was going to wait for those parts > and do the drives > and batteries at the same time. I changed my mind; I'm not going to > wait. Plus, > the batteries may be a big enough job by themselves. I am sure the > Eaton 5PX legacy > is not a hot-swappable unit. I'll power everything down. > >> Thanks for posting about your journey; it has been illuminating to me. > > I'm glad it helps. I write mostly for selfish reasons and encourage > others to do so > too. It helps to know what you did should something go wrong and/or you > want > to repeat the procedure later. If you make your writing public it will > also > help others and I'm thankful of that.
The batteries were replace earlier today. Details with photos in the this blog post: https://dan.langille.org/2024/11/30/replacing-batteries-eaton-5px-5px2200rt-5pxebm48rt/ Some tricky bits, especially a metal nut very close to the fuses... A slice of cardboard helped me through that part. BONUS: I ordered four more batteries than I needed (12). This means the UPS in the office, which I'm sure will start screaming for new batteries soon, has a supply already on hand. -- Dan Langille [email protected] _______________________________________________ Nut-upsuser mailing list [email protected] https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsuser
