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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?


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

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.

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.

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.


8 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.

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.

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.

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