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scooterhooten

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  • PWM is more efficient, and it offers a wider and smoother range of dimming for LEDs. The way an LED works (or any diode for that matter) is that it always drops a certain level of voltage across the LED. When you use a pot, you're reducing the current and not lighting up all the LEDs. If you watch the video where I tested the pots, there's a point where it flickers over to full brightness instead of smoothly transitioning. This is because the resistance hits a low point to which the remainder of the LEDs flick on. A pot changes the voltage and current delivered to the LEDs by burning (wasting) energy through a variable resistor. PWM, on the other hand, provides full voltage (doesn't waste any power through a resistor) and controls the intensity of the light by adjusting the percentage of …

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    PWM is more efficient, and it offers a wider and smoother range of dimming for LEDs. The way an LED works (or any diode for that matter) is that it always drops a certain level of voltage across the LED. When you use a pot, you're reducing the current and not lighting up all the LEDs. If you watch the video where I tested the pots, there's a point where it flickers over to full brightness instead of smoothly transitioning. This is because the resistance hits a low point to which the remainder of the LEDs flick on. A pot changes the voltage and current delivered to the LEDs by burning (wasting) energy through a variable resistor. PWM, on the other hand, provides full voltage (doesn't waste any power through a resistor) and controls the intensity of the light by adjusting the percentage of time the power is on. In this case, all the LEDs are turning on, but they're flickering on and off. The greater percentage of time the light is on (wider pulse), the greater the intensity of the light.

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  • I could easily do that with my setup. I'd just need to get some extension cables for when I move it off the roof. I may do just that. You could always get a chain or cable to lock it to your trailer. That way theft would only be an issue if they just so happen to have bolt cutters.

    On Amazon. They both use a Peltier device, so there's no refrigerant. The fridge claims to be able to cool to 30C (54F) below ambient. The A/C will likely only be adequate to cool the over-cab area, so we'll put up a heavy blanket/curtain to isolate that area, but that's all I really need. There's a purchase list in and excel file at the end of this Instructable with links to most of the components I bought.

    Thanks! I was originally looking for something with PWM, but everything I could find was too big to fit inside the wall. As long as I can find something that will fit in the wall, I'd much rather go with PWM.

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