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Et1 Sears Craftsman Electric Lawn Tractor


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#31 DH1 ONLINE  

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Posted March 06, 2012 - 10:02 PM

I posted this link before and the fellow has just updated it.
He has been mowing his grass for 7 seasons and his batteries are now loosing there capacity.

http://www.evalbum.com/918
918a.jpg
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#32 mjodrey OFFLINE  

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Posted March 07, 2012 - 06:59 AM

Doug,thanks for the link.

#33 DH1 ONLINE  

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Posted March 11, 2012 - 08:17 PM

Update
Today was a super nice day, I mounted the mower deck on the tractor and everything fits good.
I got all the pins, clips, washers whatever was needed to mount the deck properly came with this tractor.
Next step is make a motor mounting plate and some battery racks.

#34 DH1 ONLINE  

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Posted December 29, 2013 - 06:53 PM

Another project I started that is sitting around in pieces.

Time to do something with it.



#35 toomanytoys84 ONLINE  

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Posted December 31, 2013 - 10:11 AM

Seems like a pretty expensive project.  499 bucks for the motor?  Wowzers. 

 

Are you directly supplying 48V to the motor without a controller?



#36 DH1 ONLINE  

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Posted December 31, 2013 - 10:51 AM

 

 

Are you directly supplying 48V to the motor without a controller?

 

That's the idea, use the tractors clutch and trans-axle to control speed and direction.


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#37 toomanytoys84 ONLINE  

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Posted December 31, 2013 - 11:07 AM

That's the idea, use the tractors clutch and trans-axle to control speed and direction.

 

Thats pretty cool.

 

How are you controlling under voltage?  Full charge you have 48V, then slowly will drop down, I figure that motor won't run on anything less than 36v.  Do you have a system in place to shut it down once you hit a low threshold? 


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#38 DH1 ONLINE  

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Posted December 31, 2013 - 01:19 PM

The motor I have will run with a single 6volt battery at about 432 rpm. With less power.

The motor turns 72 rpm per volt, so 48volts = 3456 rpm.

 

There's a lot of variables that will affect the motors rpm.

Batteries, connections,  wire size, temperature, load on the motor. + ???

 

When the battery pack drains down low, the voltage drops a lot, and rpms.


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#39 toomanytoys84 ONLINE  

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Posted December 31, 2013 - 02:02 PM

I understand what you are saying

 

My question is.   How are you protecting it from under voltage.  As your battery voltage decreases your amperage is going to increase.  I've seen this with golf carts we run around our shop.  If they are really dead, it will flat out melt a battery post off or start melting wires.  The heat generated gets quit high.  Enough to melt lead(621 degrees)

 

I was wanting to know if you have a low voltage point to protect the system.  I could see myself out there cutting grass and not paying attention and its dieing, obviously you would notice a slow down, but it would just start building heat.


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#40 DH1 ONLINE  

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Posted December 31, 2013 - 02:11 PM

OK I see what your getting at.

Basically no, not planning on any kind of low voltage warning system.

It will have a Volt and Amp meter, so I will have to watch and listen,

as the battery pack drains, the motor will slow and the voltage drop more.

That I guess is my low voltage indicator.

 

This thing will only be good for + or - 1hr run time cutting grass.


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#41 toomanytoys84 ONLINE  

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Posted December 31, 2013 - 02:31 PM

OK I see what your getting at.

Basically no, not planning on any kind of low voltage warning system.

It will have a Volt and Amp meter, so I will have to watch and listen,

as the battery pack drains, the motor will slow and the voltage drop more.

That I guess is my low voltage indicator.

 

This thing will only be good for + or - 1hr run time cutting grass.

I see what you are doing.  I was just concerned about heat generation as voltage decreases.

 

I'd like to see a video of this thing running when you get it done.  That motor is quite impressive.  I'd love to put one on a go kart.



#42 Sparky OFFLINE  

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Posted December 31, 2013 - 02:56 PM

With the ability of microprocessors to have inputs for almost anything , I am looking for controller descriptions that integrate temp of batts into performance . The motor and controller are expensive but the batts also take a beating under heat buildup . Chargers now do heat sensing for fixed site batts . I think that is what is holding me back from getting a controller , we know it can be done .



#43 Sparky OFFLINE  

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Posted December 31, 2013 - 07:42 PM

sol%20jr.jpg      Soliton Jr  controller that will make adjustments for low battery voltage with programmed limits . Kinda  pricey at  approx 2k dollars. 

  

 

  Made for EV'rs  who are high end already in product.






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