RE: (ET) Re: Soneil charger experiences & advantages

["harry landis" <hlandis hotmail com>]

Funny thing, that´s exactly what the Landis controller does- it gives a 5 
minute full power pulse, then shuts off and waits for the battery rest 
voltage to fall below 38V, then gives it another 5 min pulse. If the barrery 
pack is low, the pulses are almost continuous, if it is fully charged, it 
gives a couple per day. This also pretty well takes care of keeping the pack 
equalized.

Harry Landis

From: "Markus Lorch" <mlorch vt edu>
To: "'David Roden (Akron OH USA)'" 
<roden ald net>,<elec-trak cosmos phy tufts edu>
Subject: RE: (ET) Re: Soneil charger experiences & advantages
Date: Tue, 19 Apr 2005 11:21:37 -0400

On another note, the lead engineer from Soneil, Sach Jain, tells
me that the charging curve of the 1212 charger (5A) is in his
oppinion better than that of the 1206 (3A). The 1212 will not float
the batteries at a constant voltage but rather wait until they
drop below a set point due to self discharge and then charge with
a full power pulse until they are full again. This pulsing to maintain
the battery at full state will help to break down remaining lead
sulfate crystals. Many people and customers however prefer the
constant float voltage method of the 1206 and from battery manufacturers
I got conflicting answers as to which is the better method depending
on who I asked within the same company.

Markus

> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu
> [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of
> David Roden
> Sent: Sunday, April 17, 2005 2:06 AM
> To: elec-trak cosmos phy tufts edu
> Subject: (ET) Re: Soneil charger experiences & advantages
>
>
> It may not be too big a deal in our application, which is a
> relatively low
> stress one for batteries, but golf car batteries are usually
> happier when
> they're hit with a more muscular initial charge than 3 amps.
> A lead battery
> really should have a charge that starts in the range of C/10
> to C/5 (that
> is, amp-hour capacity expressed as amps divided by 5 to 10).
> Thus a 250 amp-
> hour battery should be charged at 25 amps or more.
>
> I'm not an electrochemist, and my understanding of the reason
> for this is
> rather dim.  I get the impression that the higher current
> somehow penetrates
> the lead sulfate on the plates (this lead sulfate is NOT a
> pathological
> condition, as some gadget marketers would have you believe,
> but rather a
> natural consequence of discharging a battery).  From what I
> understand, it's
> NOT necessary to have that high a current during the entire
> charge period,
> just for the first few minutes or so.
>
> Some batteries need this more than others.  In particular,
> Hawker Genesis
> batteries are notorious for developing severely reduced
> capacity if they
> don't have high current charging at least on some cycles.
>
> A set of low current modular chargers is probably fine for
> performing the
> finish charge on your battery pack, but it may be a good idea
> to use the GE
> charger for at least the first few minutes when you recharge.
>
>
> David Roden - Akron, Ohio, USA
>
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