nuckolls.bob(at)aeroelect
Guest
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 Posted: Tue Apr 15, 2014 5:43 pm Post subject: Schumacher XC75W charger |
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I've been doing some tests on a 100Ah rated (20 hr rate)
battery that uses carbon foam for one of the grids. Ostensibly
lighter that a battery with both grids of lead.
http://tinyurl.com/q5hu266
Needed a robust charger for getting this puppy re-charged.
At the same time, I was interested in evaluating one of Schumacher's
current offerings in programmed chargers.
Bought a XC75W with nice buttons, annunciators and digital
display. Max charge rate was advertised as 20A. The first
time I plotted a recharge in the "AGM" mode, the charger
wanted to top-off charge at well over 15 volts. It had
barely leveled off at 15.7V when the microprocessor deemed the
battery charged!
The battery wheezed and whistled for a couple hours after
the charger shut down.
[img]cid:.0[/img]
On the next cycle, I used the "GEL" mode. This mode tops off
at 14.4V . . . can't speak to ideal protocols for GEL batteries
but this looks like a good one for AGM as well. It's interesting
that it spent about as much time in top-off as it did for
charging.
[img]cid:.1[/img]
Will learn more about this charger as testing progresses
on the battery. I may see if Schumacher's engineering staff
will comment on these findings . . . but in any case,
AGM mode in this charger is not recommended for any battery.
Watch this space . . .
Bob . . .
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