LEAD ACID BATTERY
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From: Robert Baer on 31 Mar 2006 17:40 ------- SNIPped for brevity and sanity ------ Get off your asinine rants about google groups and posting "rules" that do not apply to any of the answers or posting(s) related to this message. Either give a decent answer *without* unrelated griping, or SHUT UP.
From: budgie on 31 Mar 2006 19:47 On 31 Mar 2006 13:26:58 -0800, "RHRRC" <h.lewis(a)connect-2.co.uk> wrote: (snip good stuff) >'C' is merely a short-hand way to refer to the capacity of a battery at >its declared (20hr) discharge rate. Sorry, couldn't let that one go through to the keeper. 'C' refers to the capacity of the battery at the rate that (superficially) is the one-hour rate. i.e. the 13Ah battery's 'C' is 13A. C/20 is the discharge rate of 13/20 for that battery i.e. 650mA. and as the O/P's required current is 700mA the redcution in performance would be absolutely marginal, giving his target of 12 hours almost spot-on.
From: budgie on 31 Mar 2006 19:51 On Sat, 01 Apr 2006 08:47:10 +0800, budgie <me(a)privacy.net> wrote: >and as the O/P's required current is 700mA the redcution in performance would be >absolutely marginal, giving his target of 12 hours almost spot-on. Aaarrrggghh! My turn to stuff up! Ignore that line, Particularly if the O/P really meant: " I have to design a voltage source ( +/- 18volts, 13A )"
From: Robert Baer on 1 Apr 2006 03:42 budgie wrote: > On 31 Mar 2006 13:26:58 -0800, "RHRRC" <h.lewis(a)connect-2.co.uk> wrote: > > (snip good stuff) > > >>'C' is merely a short-hand way to refer to the capacity of a battery at >>its declared (20hr) discharge rate. > > > Sorry, couldn't let that one go through to the keeper. > > 'C' refers to the capacity of the battery at the rate that (superficially) is > the one-hour rate. > > i.e. the 13Ah battery's 'C' is 13A. > > C/20 is the discharge rate of 13/20 for that battery i.e. 650mA. > > and as the O/P's required current is 700mA the redcution in performance would be > absolutely marginal, giving his target of 12 hours almost spot-on. One might think that, but he has voltage constraints that requored a more thorough analysis...
From: Robert Baer on 1 Apr 2006 03:44
budgie wrote: > On Sat, 01 Apr 2006 08:47:10 +0800, budgie <me(a)privacy.net> wrote: > > >>and as the O/P's required current is 700mA the redcution in performance would be >>absolutely marginal, giving his target of 12 hours almost spot-on. > > > > Aaarrrggghh! My turn to stuff up! Ignore that line, > > Particularly if the O/P really meant: > > " I have to design a voltage source ( +/- 18volts, 13A )" So? Use of three 6V batteries in series gives 18V. |