The reason that the rating is at 25 amps specifically is that 25 amps is the typical rate of consumption for a car with a defective alternator or a missing fan belt. The 25 amp hour rating is an indication of how long you can drive your car before it quits operating altogether if one of the above failures occurs.
SAE (society of Automotive Engineers) adopted the 25 amp rate as a standard for that reason 4 or 5 decades ago. It’s strange the things you remember after years and years in the automotive industry. Rick Brass BSME from General Motors Institute, among other arcane things. From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Della Barba, Joe via CnC-List Sent: Friday, July 13, 2018 7:41 AM To: 'cnc-list@cnc-list.com' <cnc-list@cnc-list.com> Cc: Della Barba, Joe <joe.della.ba...@ssa.gov> Subject: Re: Stus-List [EXTERNAL] Re: 455 minutes at 25 amps... Yup – 1 amp for one hour is 1 AH. There is a reason for the 25 amp rate. A 200 amp hour battery will, in theory, provide 200 amps for 1 hour or 1 amp for 200 hours. In real life that does not work, at 200 amps you would get less than one hour and at 1 amp you would get more than 200 hours. Without the 25 amp rate a creative ad writer might advertise a 200 AH battery as a 240 AH battery (at 1 amp LOL ) Joe Coquina C&C 35 MK I From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of svrebeccaleah via CnC-List Sent: Thursday, July 12, 2018 8:12 PM To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> Cc: svrebeccaleah Subject: [EXTERNAL] Re: Stus-List 455 minutes at 25 amps... If I remember my electrical schooling. (It's been a looong time) 455 ÷ 60 × 25 = 189.5 amp hours. Hours × amps = amp hours. Doug Mountjoy Rebecca Leah LF39 Port Orchard YC, WA. -------- Original message -------- From: David via CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > Date: 7/12/18 15:13 (GMT-08:00) To: CNC CNC <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > Cc: David <davidrisc...@msn.com <mailto:davidrisc...@msn.com> > Subject: Stus-List 455 minutes at 25 amps... I'm still stuck in the old school amp hours capacity. And my new batteries are telling me 455 minutes at 25 amps. Could someone better at this basic concept help me equate this information to amp hour capacity? Rey to set my amp/volt meter. Thanks in advance. Get Outlook for Android
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