RE: (ET) Fw: [WT] Trickle Chargers

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

I trickle either pairs on 12 V setting, or singles on 6 V.  My trickle 
charger is a 15 Amp.  I typically use it for the first hour or two, and 
let the ET charger brute force it up from there.  I also have a charge 
equalizer I designed and built (I would share the schematic but the patent 
isn't filed yet) based on using op-amps to share charge, batteries can be 
thought of as non-linear integrators.  The op-amps share charge between 
batteries, but I can't dump enough current to do all I want.  Anyway, it 
is a problem.

Larry Elie


-----Original Message-----
From: David Roden (Akron OH USA) [mailto:roden ald net]
Sent: Wednesday, May 23, 2001 12:59 AM
To: Elie, Larry (L.D.)
Cc: elec-trak cosmos phy tufts edu
Subject: RE: (ET) Fw: [WT] Trickle Chargers


On 22 May 2001, at 10:19, Elie, Larry (L.D.) wrote:

> Three of the batteries do the back
> lift and they have to lift almost 300# of tiller at each end of the 
> field.
> Up/down perhaps 30 times in an hour.

This has been bothering me for a while -- this inequitable distribution 
of load because of taps for front lift, rear lift, and lights.  I use 12v 
chargers on 12v batteries, so they are more evenly charged, but the ET 
charger equalizes them by brute force.

I think the ET could benefit from a DC to DC converter, delivering 12-15 
volts for the accessories from the 36 volt pack.


David Roden - Akron, Ohio, USA
1991 Solectria Force 144vac
1991 Ford Escort Green/EV 128vdc
1979 General Engines ElectroPed 24vdc
1974 Honda Civic EV 96vdc
1970 GE Elec-trak E15 36vdc
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