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Forum Index : EV's : Bj’s BE-lawnmower
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| BjBlaster Regular Member  Joined: 04/04/2008 Location: AustraliaPosts: 55 |
Hi Guys, Most of you have seen my lawnmower, but for those who haven't it's here 
It's still going on the same set of batteries 4 years later :) Cheers Bj Check out my projects here in: Bj's Shed |
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Downwind Guru  Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
Nice work and Mr Victa would be proud of you. 
I noticed it do not have reverse. 
Pete. Sometimes it just works |
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| grub Senior Member  Joined: 27/11/2007 Location: AustraliaPosts: 169 |
Looks great. How long will it cut grass on a charge? |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5012 |
Hey Bj, I was wondering if the 500 watt motor has enough power to throw the cut grass into a catcher? I have a 4 stroke push mower I use around the house, cause its got a catcher and leaves a nice looking yard, and I can also use the grass clippings for compost. I use the ride on mower, with no catcher, for the wider area, where I dont care about the grass clippings. The push mower motor is very sad, big end knock and smokey, but it only needs to run for 10 minutes so I get away with it. I would like to conver it to electric, but only if the grass clipping catcher still works. I do have a old Ford starter motor I can use, the drive extends past the casing, so it would be easy to adapt to the mower. I guess it would have a hp or 2, but being a series wound motor, controlling the RPM might be a problem. Glenn. The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| VK4AYQ Guru Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi Gizmo I have used starters in the past but found that the bushes needed replacing with bearings, a 150amp switchmode speed regulator is required, they still overheat in about five minutes as there isn't any ventilation. I had better results with a large 12 volt generator running on 24 volts, a 100 amp speed regulator is enough, my last one worked about the same as the 3 hp BS motor, but you need to be a bit gentle in taller grass. Average current was around 50 amps. I Gave mine away as it was heavy to push with two car batteries on it. I think if you go that way it is worth fitting larger diameter wheels with ball bearings to make it better to handle. All the best Bob Foolin Around |
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| BjBlaster Regular Member Joined: 04/04/2008 Location: AustraliaPosts: 55 |
Mine works a treat, it throws it into the catcher fine and that is at ~330W (it's de rated a bit because I'm using a 36V motor at 24V) If you let the lawn get a little bit too long (150mm or so), then it slows down a tad but still has enough torque to cut it up and catch it with the catcher. I converted it to a 4 blader and this helped a lot with the cutting finish and efficiency ;) I can mow my whole lawn front and back ~400m2 and still have 24.4V in the pack. That is around 35 minutes. Your mileage may vary. Cheers Bj Check out my projects here in: Bj's Shed |
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| Downwind Guru Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
What was the motor out of, or where can one source one, and at what price. Pete. Sometimes it just works |
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| BjBlaster Regular Member Joined: 04/04/2008 Location: AustraliaPosts: 55 |
I got mine form Oatley Electronics Check out my projects here in: Bj's Shed |
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| Downwind Guru Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
Ok thats not a bad deal. I see a few others there as well that might even be better suited. 
Pete. Edit.....on closer inspection the last motor might be a little high in rpm at 12,500  Sometimes it just works |
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| BjBlaster Regular Member Joined: 04/04/2008 Location: AustraliaPosts: 55 |
Yes it would be much better as the 24V version, but when I got mine the 36V motor was the only top/shaft mounting one they had like that...  Check out my projects here in: Bj's Shed |
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KarlJ Guru Joined: 19/05/2008 Location: AustraliaPosts: 1178 |
BJ blaster you are THE man. I just read all the projects on your site, nice one I'm in Perth would love to come visit some time. Karl Luck favours the well prepared |
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