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Thread: More Mule then Rover?

  1. #261

    Re: More Mule then Rover?

    gotta wonder....
    this season's task was a standup mower using (2) 4 pole 1000W servo motors(mowing 2 acres a week).

    the frame used was a commercial 48" brand(gravely) that weighed 300lb alone, with
    me ,batteries,servo motors and brackets, and gas engine the weight of that task was
    greater then the mule's winter weight(with empty bucket).

    the mule is now using (4) 2 pole open-loop motor(watt rating not supplied), if the
    sabertooth 2x60 can survive the standup mower task, it should survive running (2) 2 pole motors in parallel.

    the main drive train is 10 teeth on the motor output shaft, and 30 teeth on the drive axle with 18" tires,
    the front uses 10 teeth on the motor output shaft, and 21 teeth on the drive axle with 13" tires, so they
    should respond at the same ground speed.

    using 1 sabertooth 2x60 and fused at 160Amp to power all four motors would be sweet.

    Click image for larger version. 

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    from the manual of the sabertooth 2x60
    Out of the box, the Sabertooth can supply two DC brushed motors with up to 60A each. Peak currents of 120A per channel are achievable for a few seconds.
    Overcurrent and thermal protection means you'll never have to worry about killing the driver with accidental stalls or by hooking up too big a motor.
    Last edited by Tommy_T; 6 Days Ago at 08:34 AM.

  2. #262

    Re: More Mule then Rover?

    not even going to try it...

    if I could pick the mule up and bring it back home if it fails when it's dark and -20degf outside
    then it would be worth looking at. but I currently can't.

    having two different drive systems would at least give me a way to limp back home if one fails.

    the drive never failed last winter, last failure was a 17mm axle, now using 25mm axles.
    Last edited by Tommy_T; 5 Days Ago at 04:26 PM.

  3. Re: More Mule then Rover?

    found a small briggs engine with 12vdc starter motor on craigslist for $100 to power the 24Vdc 100A alternator for the mule.

    started first try and doesn't smoke (sweet!)

    seems to be a 1982 engine that has not seen much use.

    hope to use the engine's 12vdc charging system to charge the 12vdc battery used
    to power the mule's control/lighting systems and starting the engine.

    24vdc batteries only going to power the (3) Sabertooth speed controllers
    (1) 2x60 (rear drive motors)
    (1) 2x32 (front drive motors)
    (1) 1x50 (lift/dump) plan to replace with a 2x60 at some point(powers 1000W motors)

    Click image for larger version. 

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    Click image for larger version. 

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    Last edited by Tommy_T; 1 Day Ago at 08:09 AM.

  4. #264

    Re: More Mule then Rover?

    started first try

    Also, looks like just the right size to run that 2.4 kW generator. And at $100, it sounds like you got a good deal!

  5. #265
    Join Date
    Sep 2010
    Rep Power

    Re: More Mule then Rover?

    Just needs a new boot on the spark plug connector... and might be a bit under-powered for that alternator at full load. 1[hp] is 746[W], so even 100% conversion efficiency won't give you full 24V 100A. Worse still is that the nameplate ratings are usually quite optimistic with output significantly decreasing over time, and the 12V starter battery charger may cut that rating further.

    Lost power again for several hours Friday night because of an unexpected storm, so that reinforced my desire to turn the engine from my current pull-start push-mower into an emergency generator whenever I finally get my rover mower up and running safely - been neglecting projects because of work. Honda being Honda, the engine still runs quite well after ~15 years of use (30~80 hours a year) with only ~3 attempts at maintenance over that period (two in the last three years). Ran the first blade without sharpening/balancing until it finally wore so thin hitting pine cones and sticks that a chunk broke off 2~3 years ago, and that was also when I finally changed the spark plug for the first time... Given that prolonged abuse, it could use a full rebuild to clear out the grunge that has undoubtedly built up, which would also let me figure out the exact source of the oil that sometimes collects on the cutting deck when left in storage. As part of the rebuild, it would also get a larger intake filter system and a proper muffler because it is a loud little 5.5[hp] engine.
    Please pardon the pedantry... and the profanity... and the convoluted speech pattern...
    "You have failed me, Brain!"

  6. #266

    Re: More Mule then Rover?

    And at $100, it sounds like you got a good deal!
    jwatte, I don't get buyers remorse too much anymore, now I just think what's plan B.

    might be a bit under-powered for that alternator at full load.
    tician, it just got even more under-powered for this build, the documentation for the engine
    lists the on-board charging system as 6W, to continuously run the cameras/lighting and control
    systems I'm going to need 100W charging. so I'm going to have to add a small 10A 12v alternator also.

    proper muffler because it is a loud little 5.5[hp] engine.
    when I started the 3.5hp engine, the first thought was how quite it was compared
    to the noise my 14hp motors make.

    the hardest part of this upgrade(gas engine) is going to be controlling the noise, because the
    mule has to operate late at night, and early in the morning.

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