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I've been wanting to do this for some time.

I've seen a number of builds that use electric wheelchairs as a starting point, as most of the controls are already there. The cutting blade really doesn't need to be that powerful, I have an electric mower (22") and it pulls around 10 amps (120V AC) so a big blade should only need around 50 amps. I can't imagine using an EV size motor for just the blade, but if you go with an 11" you should be ready for the zombie apocalypse.

Here's a few examples I've come across, I think these all have gas blades, but that'd be the easiest part of the project.
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