On 1/27/2013 11:30 AM, Lee Hart wrote:
On 1/26/2013 11:37 PM, Chuck Hursch wrote:
[snip]
I can't help you with the Elcon (never seen or tested one). But you are
correct that the proper charge voltage for old lead-acids goes down with
age. A new 6v battery ends its charge at about 7.5v and 5 amps; an old
one is more like 7.2v and 10 amps.
I've had the best luck with chargers that use some form of dv/dt or
di/dt algorithm. These algorithms watch the voltage and current, and
shut off when the voltage stops rising (or the current stops falling).
I think the Elcon gets set up with IUI for floodies, with perhaps even a
fourth-stage trickle charge. Knowing how Greg McCrea set up my K2 after
he did the one repair back in 2006, it's going to be IUI. I think
USBattery once upon a time recommended IU, but it now seems to be IUI.
I'm not at all clear if there's an advantage one way or the other.
Third-stage `I' may give you more assurance of getting the amp-hours
into the pack.
I think you could *add* something to the charger to produce this
behavior. It could detect the old battery's "full" point, and just shut
off the charger.
Yeah, maybe that's what has to happen. Something to watch the dV.
However, an aging battery is probably going to be dumped in the bulk
charge stage, 13A to nothing in a heartbeat.
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