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Re: (ET) Electric Tractor Conversion Update
Meant half the range due to 2 motor's combined inefficiencies, extra
weight for starting inertia and hills, drive train losses (Etracks have
very little, hydrostats have a lot more). Shoulda expanded on that.
Weight distribution will also be a problem. Will have to work it out
close to what that grasshopper started at. The GE design is essentially
a well balanced box full of heavy batteries and stuff and they did a
splendid job of it.
Dave
Weymouth MA
On Wed, 22 Nov 2006 07:47:04 -0500 "Matthew callahan"
<callahanrc hotmail com> writes:
> Just because it has two motors doesn't necessarily mean that the
> mower will
> have half the range. The motors would just share the current that
> is needed
> to move it in any direction. IE half-half current to each motor to
> go
> forward, full/zero to turn right, zero/full to turn left, or such.
>
> However, added weight is defintely a concern with gas tractors for
> those
> were not originally designed to carry 350# in batteries, but I
> imagine that
> they had some good amount of safety factor built in because of the
> rough
> terrian they work on. Meanwhile work off those McDonalds
> cheeseburgers and
> contribute less to the rider weight factor while you're at it :)
>
> Matt
>
>
> >From: David C Robie <mycroftxx1 juno com>
> >To: metman glasgow-ky com,elec-trak cosmos phy tufts edu
> >Subject: Re: (ET) Electric Tractor Conversion Update
> >Date: Tue, 21 Nov 2006 20:17:47 -0500
> >
> >
> >This thing is going to be heavy (due to battery weight and second
> >Emotor). You'll have to deal with that. By makin her heavier.
> >Reinforcements etc.
> >
> >Also - due to the 2 motors (rather than one in an Etrack) she will
> get
> >half the range of an Etrak (figuring same battery AH capacity)
> >
> >We figure these Etractors at 15 HP equivalent. (The guys that do
> tractor
> >pulling are puling against that range of tractor and doing well)
> One
> >motor running at a constant speed (TBD by experiment) running a
> pump
> >would do it HP wise if your joystick for turning is 'proportional'
> >delivery from pump to both the wheel motors.
> >
> >What will drive the deck? Is it hydraulic? (another motor
> needed??)
> >
> >
> >Dave
> >
> >Weymouth MA
> >
> >
> >
> >On Tue, 21 Nov 2006 08:07:22 -0600 "Mike Wallace"
> <metman glasgow-ky com>
> >writes:
> > > Geof and all,
> > >
> > > Speaking of converting from ICE to electric, I could use some
> advice
> > > and/or tips on doing something similar myself. Ever since I met
> > > Shawn Lawless last year at the Louisville Lawn Expo and saw his
> ZTR,
> > > I've wanted to try something similar.
> > >
> > > I recently bought an older (late 80's maybe) Model 411
> Grasshopper
> > > with intentions of converting it. It currently uses an 11 hp
> Briggs
> > > (horizontal shaft) driving two Eaton hydro units that then drive
> the
> > > wheels through 13:1 double chain reduction systems.
> > >
> > > I'm thinking about using two E15 drive motors and two Alltarx
> units
> > > to drive them. Without a lot of major changes, I think I can
> > > position the two drive motors parallel to each other with one
> > > pointing east and the other pointing west. I'll mount the
> smallest
> > > possible #40 sprockets to the output of each motor to drive the
> > > first 4:1 reduction.
> > >
> > > One possible problem I'm wondering about is that one motor will
> be
> > > turning it's normal "optimum" direction and the other will be
> > > essentially running in reverse while the mower is going forward.
> > > And visa versa for when backing up.
> > >
> > > Do I need to consider modifying the brush position/location or
> even
> > > possibly the field winding connections such that when going the
> > > predominate forward direction, both motors are in "optimum"
> > > direction mode?
> > >
> > > With the Briggs engine gone, (this is a front mounted deck
> > > Grasshopper with the single tail caster wheel) I figure there
> ought
> > > to be plenty of room to finally do something with those 60+ Saft
> > > BB-600 NiCads I've had for about a year now.
> > >
> > > I figure I'll replace the current shaft driven 36" deck with a
> 42"
> > > ET deck and that swap shouldn't be a big deal.
> > >
> > > Any of you guys got any suggestions or words of wisdom for me?
> > >
> > > Mike in KY
> > >
> > > ----- Original Message -----
> > > From: ThompsonG DFO-MPO GC CA
> > > To: elec-trak cosmos phy tufts edu
> > > Sent: Tuesday, November 21, 2006 6:38 AM
> > > Subject: (ET) Electric Tractor Conversion Update
> > >
> > >
> > > Hello All
> > >
> > >
> > >
> > > www.electriclawntractor.com
> > >
> > >
> > >
> > > Edmonds Electric says the Electric Conversion Kids will be
> ready
> > > early 2007 at $2000, (not sure if that Canadian or American).. I
> > > also noticed a 36V to 120AC solid sate inverter.
> > >
> > >
> > >
> > > I've got a nice little Cub Cadet just waiting for a
> transplant.
> > >
> > >
> > >
> > > Geof Thompson
> > >
> > > A-60,
> > >
> > > E-81,
> > >
> > > ER8-36,
> > >
> > > R-36
> > >
> > > E-8,
> > >
> > > E-10x2,
> > >
> > > E-12M,
> > >
> > > E-12,
> > >
> > > E15x2,
> > >
> > > E-20x2,
> > >
> > > B-145X2,
> > >
> > > C-185,
> > >
> > > E-141X2.
> > >
> > > I-5
> > >
> > > (21)
> > >
> > >
> > >
> > >
> > >
> > >
>
>------------------------------------------------------------------------
-
> >-----
> > >
> > >
> > > _______________________________________________
> > > Elec-trak mailing list
> > > Elec-trak cosmos phy tufts edu
> > > https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
> >
> >
> >_______________________________________________
> >Elec-trak mailing list
> >Elec-trak cosmos phy tufts edu
> >https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
>
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