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1. [Shop-talk] EE question (score: 1): Author: "Matt" <mbarre@juno.com>; Date: Sat, 3 Nov 2007 18:46:57 GMT; Our flight department generates some nice 28V batteries that have a time limit in the planes but have a lot of life still in them. I was thinking of making a UPS with them. I guess it would mean a 28; /html/shop-talk/2007-11/msg00020.html (7,543 bytes)
2. Re: [Shop-talk] EE question (score: 1): Author: "David Scheidt" <dmscheidt@gmail.com>; Date: Sat, 3 Nov 2007 15:11:31 -0400; Is it really a "28V" battery? How many cells does it have? I have a feeling that they're called 28V batteries because it's used in a 28V electrical system, but the rest of the non-aviation world call; /html/shop-talk/2007-11/msg00021.html (8,396 bytes)
3. Re: [Shop-talk] EE question (score: 1): Author: "Matt" <mbarre@juno.com>; Date: Sat, 3 Nov 2007 20:34:33 GMT; Doohhhh! in my best Homer Simpson voice... They typically read 24-26 volts. That is good news, I am sure that your are right and there should be some off the shelf components to make this easier... M; /html/shop-talk/2007-11/msg00022.html (7,847 bytes)
4. Re: [Shop-talk] EE question (score: 1): Author: Peter Murray <pete@partnercomm.com>; Date: Sat, 3 Nov 2007 16:51:32 -0400 (EDT); Most of the UPS systems I have use 24V or 48V battery systems (12V batteries in series). You could pick up some used APC SmartUPS700, 1000 or 1500 and hack in several of those "28V" batteries (wired; /html/shop-talk/2007-11/msg00023.html (7,478 bytes)
5. Re: [Shop-talk] EE question (score: 1): Author: "Randall" <tr3driver@ca.rr.com>; Date: Sat, 3 Nov 2007 14:19:32 -0800; Are you sure they are lead-acid ? The ones my helicopter pilot buddy used to give me were nickel-cadmium. FWIW, some APC UPS units at least used to have external battery connections. Even if you had; /html/shop-talk/2007-11/msg00024.html (7,029 bytes)
6. Re: [Shop-talk] EE question (score: 1): Author: "Matt" <mbarre@juno.com>; Date: Sat, 3 Nov 2007 21:33:41 GMT; Definitely lead acid for us. OEMs often use NiCad but they are pricey and come with the risk of thermal runaway at no extra charge... I hear the risk of TR isn't what it used to be when they first ca; /html/shop-talk/2007-11/msg00025.html (7,652 bytes)
7. Re: [Shop-talk] EE question (score: 1): Author: "Bill Gingerich" <bill@gingerich.us>; Date: Sun, 4 Nov 2007 22:26:35 -0600; We have several 3, 5, and 10 KVA APC rack mount UPS' at work, and all of them have plugs for eternal battery packs. I believe they are 48 volt, but I'm not 100% sure. I would think finding used units; /html/shop-talk/2007-11/msg00026.html (7,784 bytes)
8. Re: [Shop-talk] EE question (score: 1): Author: Steven Trovato <strovato@optonline.net>; Date: Mon, 05 Nov 2007 01:21:09 -0500; Ah, eternal battery packs. If only there was such a thing, wouldn't it be great? :-) _______________________________________________ Shop-talk mailing list http://autox.team.net/mailman/listinfo/shop; /html/shop-talk/2007-11/msg00027.html (6,937 bytes)

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