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Re: (ET) E-15, need a smart battery charger guidance & recommendations
With new batteries, I don't do a full discharge. Yes, it takes around a day for the charger to be done. Igbi need it recharged quicker, I could turn on the oem one. I mostly use it to mow grass now. For snow I have a big loader backhoe with a heated cab.
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-------- Original message --------
From: David Roden <etpost drmm net>
Date: 5/19/17 1:55 AM (GMT-05:00)
To: elec-trak cosmos phy tufts edu
Subject: Re: (ET) E-15,
need a smart battery charger guidance & recommendations
On 18 May 2017 at 23:49, David Tiefenbrunn wrote:
> I saw on the other thread, I should get a model that hits harder for
> the charging ...
Agreed; the Soneil 3610SRF seems pretty small for this use. If I'm reading
the Soneil website right, it charges at only 4.5 amps.
I take it you don't have to use the tractor very often? At that rate, the
charging time from all the way flat would be rather long. Just the bulk
phase (0% to 80%) would take about a full day (24h).
> I'd need some circuit to monitor that all 3 pairs are in the same
> state of charge to avoid damage if one charger failed.
An easy way to do this would be to buy 3 of those cheap bar-graph voltmeters
I see in varioius places online (typically $3-10 each) and put them side by
side, maybe with their long axes set vertically, on the instrument panel.
If you see one dipping way bekiw the others, you know something's wrong.
(Be sure to fuse them.)
I did something similar years ago with analog edgewise panel meters. The
bargraph displays would be better, because they're more visible.
Another method, maybe even cheaper and certainly easier to mount, would be
to configure 3 LEDs (any color), one for each 12v pair or battery, with a
series zener diode and resistor so they're just on at 10.5 volts. Even
better, make 6 to monitor every single golf car battery. Human eyes are
pretty good at seeing differences in brightness. If you see one LED go out
on acceleration, or even get appreciably dimemr than the others, you know
you should stop and investigate.
David Roden - Akron, Ohio, USA
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