Most mobility scooter and wheel chair motors will run 12 and 24 volt. I have a 2 way switch and run it on 24v volt until the traces start coming up the beach then flick it to 12v. if avoidable you never want the main line to go slack hence the use of 12v for the short amount of time. the most common mobility scooter motor has a large plastic gear in them, while the motor is still good I would recommend taking it out and getting a new one water jet cut and it will handle much more strain. I was using 2x motor bike batteries to run winch and could do a whole day out of the pair now to save on carting so many batteries I use the spent ones from kontiki and have a back up from some 7.5 amp hour batteries the alarm companies normally give away.
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