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A cordless mower made from a 12V DC starter motor, mounted up with a 12V battery mounted on a junk mower frame Answered

I'd like to try mounting a car starter motor with a 12V battery on a rescued-from-trash mower chassis. Has anybody tried this?

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dartmouthguy

9 years ago

Thanking you all again. I'm reconsidering the whole affair, but - I removed a 12V DC starter motor from a 15hp lawn tractor at the dump and, as the summer is at the top of the 9th, I'll make this a winter project at the work bench on those gray, chill and snowy days in here SE Mass. Thanks, guys

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rickharris

9 years ago

1. It will go VERY fast 2. The starter motor is designed to run with a considerable load without this load it may run wild i.e. just go faster and faster 3. the started motor will pull a LOT of electricity from your battery so it might not last long. 4. All of these are reasons why people building electric cars don't just use a starter motor. NOW IF you can get hold of an old Dynamo then you might be in busines although you will need gears.

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dartmouthguyrickharris

Answer 9 years ago

Thank you all, and many apologies for the late reply Then, how a bout a smaller starter from a m-cycle or outboard with some sort of controller on it.

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jtobako

9 years ago

A starter motor that runs too fast (ie without a load) can break up. I had a starter switch stick 'on' and the starter stayed engaged until the insides self destructed about a mile down the road.

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jj37

9 years ago

If you use a starter motor it may t last as few as 60 seconds due to the fact that the motor normally sucks a ton of power and usually runs under a very high load and also it may be dangerous if power is the same and load is next to nothing.

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brokengun

9 years ago

Do not use a starter motor, you'll be displeased with the results for reasons already listed.

This guy did it: http://arttec.net/Solar_Mower/index.html
I know that he is pleased with it, so it must've worked alright.

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seandogue

9 years ago

My sole concern would be their continuous duty rating. After all, they're designed to be used for a few seconds, then rest for a long period. As to output, maybe you could control their speed & power gluttony by using a PWM controller. After all, it probably doesn't need to run at full output all the time.... it's only cutting grass, not compressing a set of cylinders.

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orksecurity

9 years ago

Just a quick reminder to be careful. The last thing you want your widget to do is get loose and/or throw the blade.