Very powerful gearbox from wiper motor.

[DIYSwede]

Given the low rev when under load, the flimsy app. 5 m long 0.75 mm2 / AWG 18 cable acted as an efficient current limiter,
against blowing the cigarette outlet's 20 A fuse, not even close of even stripping the plastic gear...
Guess the motor just received some 8 VDC & the cable became luke-warm during that test too?

My personal favorite in this area is the KSV 5035:


I've had one of these "600"-flavor mothers jam to a stop at 24 VDC & >20 A* in without shredding the Acetal 49:1 worm gear.
They've ripped frozen, stuck windshield wiper blades and arms to shreds over here since the fifties in cars, trucks and buses.
Wire feeder motors in industry grade ESAB and Kemppi welders since the seventies.

I salvage these from discarded heavy-duty office table pillars at work: +150 kg cast iron on the table: 2"/ sec raise w/o trouble at 18V in.
Made for 100% duty, -20 C Nordic weather, works for decades and they'll take anything below 50 volts and just run.
Haven't fried one yet, their magnets haven't even come close to their Curie points, and they take no prisoners without complaining.

Shortest possible length of 2,5 mm 2/AWG 14 minimum and big-amp DC supplies or SLA batteries in my builds too,
just to get that "no bull" starting torque and as stable rpm/ volt independent of loading I can get.



Just my 2 cents & YMMV

Johan

* My clamp DC ammeter simply maxed out at 20A in that test.