RioRand 7-70V PWM DC Motor Speed Controller Switch 30A

Bought to control the speed to my salt spreader for my truck,it's a tailgate spreader. Works amazing for the price can't beat it

I used this to reduce the voltage on a Power Wheels that now operates on a Dewalt 20V Max battery. The board appears to be relatively simple. I am not an experienced electrical technician, but the one feature I would have liked to see was some indication on the dial as to what voltage was being given. In lieu of this, I placed an LCD voltage monitor on the output side and can now monitor the voltage being sent to the motor, but it’s essentially useless as the meter will show high spikes of voltage and then drop, which I suspect is the result of the use of the lithium ion batteries. Nonetheless, when the dial is too low, the motor will not turn, and an adjustment of the dial will adjust in over-voltage, so this piece certainly does work.

over all it works fine for what I need a (test bench) speed controller for a PMDC 10 amp motor. Several things you will need to be aware of are 1) you will need an external on off switch, the onboard switch is NOT conveniently located for someone with big hands. 2) My input voltage was up to 60 vdc and with no soft start, unless you are starting from the minimum speed the motor will literally JUMP to lightspeed when started. 3) while it is running at a steady state periodically the controller output will HICCUP while running. not sure what causes that? Depending on your application that may be an issue. 4) The unit does not have an output voltage and/or amp meter (which is reflected in its price). 5)The motor ran smoothly and quietly while operating thru its whole speed range. However Zero was not 0 rpm the minimum output voltage was somewhere between (5-10%) 3 to 5 volts for my app. which left the motor still crawling at min speed position with no load applied to the motor. However with just my hand to create a small load the motor would stall. Running with no load on the motor (15 min max) the controller unit never got above room temp. Because of my application I am unable to put the motor (and therefore the controller) under a full load. The controller is rated at 30 Amps and my motor at full load is rated at 10 amps. OVERALL it appears to be built well. the value for the money is a fair price. Just be aware of the above mentioned Items for your application. Yes I'm happy with my purchase. The reason for the 4 ratting are the above items.

Works very well for the price

purchased this ca Feb 2025 but just got around to using this and as others have described, worked GREAT for about 5 mins and then ONLY FULL POWER (no power control). I have a similar looking PWM from another vendor (DC Motor Speed Controller PWM Controller, Enmja 7-70V 30A Adjustable PWM Motor Speed Regulator 12V 24V 36V 48V) and this has been used extensively for about 1 year and it's fine. again, these 2 units LOOK ALIKE but clearly they aren't the same. also, I did some voltage measurements on the 2 units initially and the defective unit (before being used) required advancing the rheostat near 2/3 of its entire travel before it registered anything. that was until the controller failed resulting in 100% output and NO speed control at all. I'm going to order another of the previous model (still offered by Amazon as of 6/2025) since my experience with that has been positive. but I'll avoid this one that is defective. I'll also tear it apart to see if there is anything fixable (and cheaply) and if I come up with a solution, I'll post an update. one note: as others stated, when it works, it's great. it just doesn't work for very long.

This worked great for my converting my kids power wheels to 20V tool battery. The power wheels was too fast after converting and this allows me to turn it down to a manageable speed and as my son gets older I can turn it back up. Worked great!

Looks good and works well on DYI fish thumper box. I placed the controller knob on my panel with boat gauges. But beware if you mount the switch that the depth of the plate must be less than about a 1/4 inch.

I have three of these. Used to control speed of a windshield wiper motor. They do what I wanted perfectly except for the potentiometers. They are cheap garbage and not at all reliable. Two out of three failed on first or second day of use after installation. One began randomly switching to full speed, the other became locked in full speed almost out of the box. Running the adjustment knob back and forth restored function at least temporarily telling me the wiper contacts are not clean or else corrode over time or else somehow do not function properly. The potentiometers are replaceable and not an expensive part even for a much better quality part. I am replacing all of them. Downside is the ones included are nice and small and the alternatives are all larger in size needing more volume in whatever package you build them into. Beware