RE: RE: (ET) different wiring

["Elie, Larry (L.D.)" <lelie ford com>]

I use (2) 225 Amp hour batteries, and (4) 210 Amp hour batteries.  Not by 
choice, by what I happened to get.  The 225's go to the lights and are 
also 2 of the 3 that go to the BACK lift (tiller gets a second lift, 18V, 
on the opposite 3 batteries as the front lift).  The back lift gets far 
more use; tiller is over 250 lbs and gets lifted every row.  The snow 
blower may be heavier, but it doesn't get picked up as often.  The 225's 
go dead as quickly as the other 210's.  The 225's are also slower to 
charge, forcing me to charge an extra 20 to 40 minutes for balance until I 
made the equalizer.

As far as Jeff's suggestion on one more battery; sure, with one more 
charger.  Maybe 2 more batteries; a 12 and a 6, and use 18V for the lift; 
but where do you put them?  The GE charger is 14Amps AC max; you might 
have to plug in the other charger(s) elsewhere as well.  I have tripped a 
20 amp breaker with a good 12 V charger (isolated) on 2 batteries and the 
GE on all 6.

Larry Elie


-----Original Message-----
From: Bob Murcek [mailto:RMURCEK geisinger edu]
Sent: Wednesday, October 31, 2001 12:18 PM
To: elec-trak cosmos phy tufts edu
Subject: Re: RE: (ET) different wiring


This'll sound lame, but has anyone tried using differently-sized batteries 
to make up for the uneven load?  I.e., hugh ones for batts that provide 
12V, a medium-sized one for the batt that's needed for 18V, and 
regular-sized ones for the rest?  This would force the use of separate 
chargers, though.  Or isn't it worth the effort?..Bob

>>> "Elie, Larry (L.D.)" <lelie ford com> 10/31/2001 12:03:40 PM >>>
No, unless you break the series connection before you make this parallel 
connection.  If you are willing to add 2 high-current switches to break 
the series connection, and another 3 to make your parallel connections.  
The switches are expensive.  It could be done, but if you failed to break 
even one connection, you will blow up a battery.  I'm sorry, but this 
really isn't all that easy.  Bill Gunn suggests just tapping off 12V and 
charging a bit longer to make up for the imbalance.  I designed a 
self-equalizer based on parallel integrators that I might be able to post 
after it is published (the patent will not be filed because the company 
choose a more expensive charge equalizer).  This is an old problem.

Larry Elie

-----Original Message-----
From: Jeremy Gagliardi com [mailto:Jeremy Gagliardi com] 
Sent: Wednesday, October 31, 2001 11:30 AM
To: Elec-Trak
Subject: (ET) different wiring


Instead of a DC-DC Converter, how about this?...

Hooking up the 12V components to the 3 pairs of batteries in parrallel,
like this:
12V+ to Batt1+ & Batt3+ & Batt5+
12V- to Batt2- & Batt4- & Batt6-

The 18V accessories would look like this:
18V+ to Batt1+ & Batt4+
18V- to Batt3- & Batt6-

Would that work?

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