[chbot] Deeply discharged

Jasper Mackenzie jasper.mackenzie at gmail.com
Fri Oct 13 08:38:48 BST 2017

The Epsolar Tracer 4210A was meant to have an LVDS which I suppose failed.
 Thanks for the tip. I don't have a charger that will let me be this
selective... Unless I modify my car battery charger...

On 13/10/2017 20:33, "Volker Kuhlmann" <list0570 at paradise.net.nz> wrote:

> On Fri 13 Oct 2017 17:36:07 NZDT +1300, Jasper Mackenzie wrote:
> >  They are 12V, so yes I am very worried, never seen 12V batteries that
> low
> > and recovered. Trying to fix/reverse engineer my own broken desulfator
> > (sigh) and charge at 500mA with my fingers well crossed. I just hoped
> that
> > someone would have a super smart charger that may be more effective.
> Something like constant current charge at 0.01C or less might be as good
> as you can do. Reconditioning cycles don't really make sense until the
> battery is charged again.
> I've been using a 2x12V SLA lawnmower battery pack to power camp lights,
> and once found them discharged far more than they should have been. It's
> not really wise to run any kind of load on a battery without a battery
> protection circuit. A quick search hasn't found something ready-made,
> but I'd be interested to hear if anyone sees anything.
> Some maker used a diode or 3, a resistor, and a AO3415 p-MOSFET (very
> low U_GS) to OD-protect 1-2x NiMH, but I reckon it's no good because
> with a larger load it'll blow up the FET at half the cutoff point -
> there's no sharp schmitt-trigger cutoff.
> I'm thinking of fiddling something with a TL431 or a zener, a Nexperia
> HEF40106 and a MOSFET. A 1mA draw of the protection circuit should be OK
> for a day with that size SLA. No temperature input should be fine too.
> Or maybe a 1-cell lithium protector can be misappropriated...
> Volker
> --
> Volker Kuhlmann
> http://volker.top.geek.nz/      Please do not CC list postings to me.
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