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Re: (ET) Ground up ET build



      The Brute Force approach that I would employ would entail re-fitting the control system to employ the use of armature contactors for reversing. Unless there is a superior method of surge suppression available during cycling from F to R, that poor relay ALWAYS takes the hit. :(
      On a lark, I put a set of contactors in my E-10, just to see the 
results. With the permanent magnet motor, the stops from F to R were 
violent, but tolerable. :)

RJ

On 8/6/2022 1:16 PM, Larry Chace wrote:
Greg Curran asked about wishes for a beefier ET.  What an interesting idea!
Greg, can you tell us where in the Northeast you will be?  I'm near 
Ithaca, NY, "centrally isolated" with plenty of winter weather, but 
probably not as severe as Maine or northern Vermont or New Hampshire. 
I have an E15 for plowing and mowing and an I-5 for hauling and 
snowthrowing.  The 700 foot long driveway is somewhat sloped, enough 
that the tractors clearly prefer to go downhill rather than uphill, 
especially with the snowthrower (aka "battery eater").
Both tractors seem to have about the same power, with the E15 running 
somewhat more slowly than the I-5. They are usually run with the speed 
control set to maximum, using gears to select the appropriate ground 
speed: LL for in-garage movements, L for hauling and meadow mowing, D1 
for lawn mowing and snow plowing, and D2 mostly for moving from place 
to place.  Snowplowing and lawn mowing need more frequent fwd/rev 
switching, and so the E15's hand control is more convenient. For 
hauling, the I-5' foot controller and cruise control is convenient.  
However, I added a switch to each tractor to avoid getting into 
electric speeds 5, 6, and 7.  On the I-5 that also gives an increased 
amount of dynamic braking.
For driveway clearing (700' by 12'), the E15 and plow do a great job 
unless the snow is too deep (a foot or more, depending on moisture 
content).  The snowthrower works well but it really drains the 
batteries; one trip downhill is all that they will tolerate.  I had to 
replace its drive chain once -- a truly unpleasent task (in the 
winter, of course).
I use a 3-bank 10-amp Minn-kota charger, plugging it into whichever 
tractor needs it most.  Both tractors also have their original GE 
chargers and the tractor garage has two 20-amp circuits, so both can 
be charged simultaneously.
Both tractors got new Crown batteries about 10 years ago.  There is no 
indication that I can see that they may be approaching their 
end-of-life.  The most annoying problem is the infamous reverse relay 
lock-up on the E15.  Even being VERY careful to aovid changing the 
FWD/REW switch while in motion, sometimes it just happens and that 
means pushing the tractor into the garage for relay replacement (the 
problem seems to be worse in the winter). Luckily, the house and 
garage are at the downhill end of the driveway.
The I-5's brake is just barely adequate and the E-15 brake does 
nothing.  Luckily, the snow plow and mower deck provide a certain 
amount of braking.  Both tractors have chains all the time.  (The best 
part of the lawn in mowed with a Ryobi cordless push mower rather than 
with the E15.)
What would be good to have?  Eliminate the fwd/rev relay problem, have 
a less power-hungry snowthrower, have a good way to clean the bottom 
of the mower deck,
speed up the E15's transions from electric speed 1 to electric speed 3.

My father worked for GE and I enjoy seeing the GE monogram in the center of the steering wheel whenever I drive the tractors.
In Greg's situation, it might be good to have *two* tractors.  A few 
times I've had to use one of them to pull the other.  (When I had just 
the I-5, my wife said "you should have a spare".)
Larry Chace, Ithaca, NY  E15 and I-5


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