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Re: (ET) Chargers
I recently purchased a Soneil 3610SRF from Darryl @Econogics. Prior
to this, I ironically was recharging two at a time with an old 10 amp
Schaeffer automatic / manual 12 volt charger. Whether on automatic
or manual, I was never able to get the batteries into the at least
middle of the good range (1310 of my Leica prismatic specific gravity
meter); only 1260 to 1280. I used 3610SRF for 48 hours and every cell
of every battery read dead center @ 1310 specific gravity, at 38.6
volts after sitting for three days.
Needless to say, my E12 never ran and sounded so good since I first
started using last July. I can mow entire lawn to perfection (about 1
hour steady use) with power to spare. The Soniel obviously has won my
endorsement based on my experience.
I am now inspired to finish the details and buy batteries for my
WH185. I can get 6 new Interstate deep cycles @ $95 apiece from work
from my battery wholesaler - can anyone confirm if this a good deal
Hope this helps; I must also disclose that Darryl is an interesting
person and great author and has not paid me in any way for this
On Aug 9, 2009, at 8:14 AM, Darryl McMahon wrote:
I am a big fan of modular charging (one charger per battery). I
have 12 chargers in my current electric car, one per 12-volt battery.
However, the proposed arrangement strikes me as less than optimal.
I am assuming the use of 6 x 6-volt batteries, preserving the
centre tap to power the lifts.
My primary concern is the two electrically centre batteries. The
front and rear lifts tap at the 18 volt point, which splits the
middle pair if you are charging at 12-volt points. If your use of
the lifts is unbalanced, this middle pair will likely become
unbalanced as well, and even an intelligent 12-volt charger is not
going to actively address that imbalance on the two 6-volt
batteries in series. If you are going to let that imbalance slide,
why not just one 36-volt charger for simplicity (and likely lower
If you choose to use multiple chargers in series, make sure the
chargers are rated for this application (fully isolated). Any
electrical common points in the chargers will lead to problems.
The Elec-Trak also has a 12-volt tap for the headlights, which
would be addressed by using 3 x 12-volt chargers.
I use the Soneil 3610SRF on my E12 in preference to the original
charger, and have for years. Disclosure: I am a distributor for
Soneil chargers, because of my experience with this charger.
David Brandt wrote:
I plan to use 3 12V smart chargers in my E15 - they are only about
$35 each at batteryweb.com or many similar websites. Of course if
you desire to spend a lot more by going to a Lester offboard charger,
or by getting a marine grade multi-bank charger, you can get
excellent results that way, too, but I have heard from several on
this list that went this route and would never go back.
A 3A model is the smallest that you would want to get - it'll take a
long time to charge, but a typical mowing schedule is only once a
week anyway, and the smart chargers can be left plugged in.
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