Hi There !
i had some 12v motors, from wheel loader wipers.
they are powerful enough to drive the shredder, but have sometime pain to shred plastic bottles neck. solution is to cut the bottleneck before entering the shredder.
i add a twin switch enabling to drive forward or reverse.
it is driven with a Suaoki T10 battery ensuring about 1 hour autonomy, for € 60 investment.
i also made a hopper, slightly different than PP dawings.
it is riveted, with a clear glass in front,
i will add a hinged door at the top to ensure no material gets out !
feel free to ask any questions!