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Customer Review
- Reviewed in Canada on December 10, 2023I am using this to control the speed of the fan in an air filter using a PSC AC motor. Such motors have quadratic torque but fans have quadratic drag so overall the airflow should be linear in voltage. This works ok for that purpose but there are a few caveats: 1. QA issues. My unit arrived with a random screw jammed into the outlet receptacle. It got dropped in there at some point by the manufacturer. I managed to fish it out with needlenose pliers - barely - but very annoying. Also It makes me worry about other quality issues. 2. The voltage is not linear in the dial setting. In particular, setting it to 50% only gives about 30V. Great if you want fine control over voltages at the low end, not so great if you want fine control at the high end. 3. Unit seems designed for 220V systems but works on my 120V system. But 4000W rating is probably for 220V, so scale that down to 2000W for a 120V supply. 4. Needs to have load to regulate voltage. Which probably means you should not use it for systems that need exactly a particular voltage first when turned on, e.g. electronics. This is meant for things like AC motors (at least, certain kinds that can be controlled by voltage) and resistive loads, like (small!) heaters.
I am using this to control the speed of the fan in an air filter using a PSC AC motor. Such motors have quadratic torque but fans have quadratic drag so overall the airflow should be linear in voltage. This works ok for that purpose but there are a few caveats: 1. QA issues. My unit arrived with a random screw jammed into the outlet receptacle. It got dropped in there at some point by the manufacturer. I managed to fish it out with needlenose pliers - barely - but very annoying. Also It makes me worry about other quality issues. 2. The voltage is not linear in the dial setting. In particular, setting it to 50% only gives about 30V. Great if you want fine control over voltages at the low end, not so great if you want fine control at the high end. 3. Unit seems designed for 220V systems but works on my 120V system. But 4000W rating is probably for 220V, so scale that down to 2000W for a 120V supply. 4. Needs to have load to regulate voltage. Which probably means you should not use it for systems that need exactly a particular voltage first when turned on, e.g. electronics. This is meant for things like AC motors (at least, certain kinds that can be controlled by voltage) and resistive loads, like (small!) heaters.Images in this review
