Re: [Repeater-Builder] Battery Back-up Question

[Doug Zastrow]

Kevin,   Before I take a stab at this could you give me a rough estimate of the physical size of the battery?  Where I'm headed with this is I'm trying to ascertain if your cells are truly rated at 460 amperes for a 10 hour duration or whether it's actually 460 ampere-hours (amps multiplied by the number of discharge hours) which is common for industrial cells in the US.   If truly *460 amperes for 10 hours* then your cells are capable of 4600 ampere-hours or 460 amps continuously for 10 hours.   If *460 ampere-hours at a ten hour rate* then you're looking at 46 amps over 10 hours.  A considerable difference.   (The physical size of the cell will hint as to which is correct.)   The other caveat is that the longer the discharge time (generally) the more effective ampere-hours that a cell will deliver before it is discharged.   If the cell is truly rated at *460 amperes for 10 hours* then you're looking at well over 460 hours at a ten amp continuous load.   If rated as *460 ampere-hours at a ten hour rate* then 46 hours at a ten amp continuous load.   As mentioned in an earlier post, the true load will play a factor.     Doug     ----- Original Message ----- From: Kevin & Natalia To: Repeater-Builder@yahoogroups.com Sent: Monday, February 13, 2006 12:07 AM Subject: [Repeater-Builder] Battery Back-up Question G'Day All, I am about to install a set of back-up batteries for our repeater. Designed for back-up use. These are 2volt cells, 460amp/hr over 10hrs. What is written on them So we have 6 cells connected together to give 12volts. We are pulling , when everything is running, no more then 10amps. As a rough caculation, I am guessing the batteries should last for around 400+ hours. Anyone got a full caculation to find out how long they will last? Regards Kevin.   Yahoo! Groups Links <*> To visit your group on the web, go to:     http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to:     [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to:     http://docs.yahoo.com/info/terms/   YAHOO! GROUPS LINKS  Visit your group "Repeater-Builder" on the web.    To unsubscribe from this group, send an email to:  [EMAIL PROTECTED]    Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.