RioRand 7-70V PWM DC Motor Speed Controller 30A - Low Heat Aluminum Housing for Brushed DC Motors, DIY Projects & Small Electric Devices (Extra Fuse Included) Green

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!

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.

This was super easy to set up and able to control the speed of sons power wheels that I converted to take Mikita batteries. The box doesn’t make any noise like some of the other products out there. The quality of it is great. It was able to fit perfectly in my son’s power wheels with no problem. Also for the price you can go wrong. It is a great value don’t hesitate get this because it’s nice to be able to control the speed of power wheels.

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.

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.

Works very well for the price

Bought this for the kids power wheel as i upgraded the motors and controller. The speed controller worked great with the 12v battery and 12v controller with 24v motors but when i changed to the 24v battery and 24v controller for the power wheel this controller did nothing. It would either be full speed, wheels not spin, power hiccup or not be responsive. When hooking back up to 12v battery and 12v controller it works fine. May have gotten a bad controller for the power wheel who knows its made in china and sold here cheap so for now i give 2.5 stars even though it shows 3

Used this controller on 12v radiator fans, and works like a charm. Easy wire up as well

The red and blue display is very attractive, substantially nicer than the photo supplied by Amazon. Like the DROK unit, voltage and current readings can be adjusted by 2 pots, if necessary, for improved accuracy. Lots of people will want to measure LESS than 10 amps (removing the necessity to use a shunt). Why, then, do all the wiring diagrams for this item show a shunt? I've included a corrected diagram and also a picture of ten 5mm LEDs wired in parallel and used as a load. If the purpose for the device is actually to measure the downsteam volts and amps coming from a 265 watt (nominal) solar panel, just remember that the 33 volts produced in the noon sun exceeds the Vcc rating that powers the volt-ammeter itself, but is well under the input voltage rating of 100Vdc. The solar 8 amps being available at maximum is nicely under the 10 amp limitation (and for much of the day the reading will be closer to 4 amps). Just make sure to consider your solar controller as the load, so the thick YELLOW wire all by itself is what connects to the controller's PV negative terminal. The 265 watt solar panel is the input source and provides the connection points somewhere downstream (but before the controller) for the thick RED and BLACK wires. If this volt-ammeter is meant to be a temporary tester only (as in my case) then a 9 volt battery will comfortably power this device for a few hours.

Excellent product. Tested it as soon as I received it and works great. For those of you looking for instructions here's how I used it: The thin red and black wires are to power the unit. This requires a voltage between 5V~30Vdc to work reliably. Below 5V, the display goes dim. Once you've powered the unit, it will display the source voltage in red digits. Now for the load current you use the thick RED, BLK and YEL wires - connect the RED & BLK to the +ve and -ve terminals of your power source respectively. Now connect the +ve of your "load' to the +ve of the power source and -ve of your "load" to the YEL wire. This should supply current to your load and display the load current in the blue display. Hope this helps.

Beau morceau, fonctionne bien. Doit avoir des notions électrique pour le brancher

It didn't come with instructions. So like an idiot I hooked red to 12V and black to ground and it started smoking. I later see the instructions on the product web page. This is partly my fault, but it sure should come with instructions. When it did work it was bright and easy to read. Word to the wise- cut off the little black wire before you blow it up like I did.