Toytaco2 wrote:Planovet,
I got the email address to their Tech Department through the link on their web site. In my email to Fantastic Vent, I just told them I was installing a new Fantastic Vent in a custom made teardrop trailer and that I had heard it was possible to slow the fan down using a resistor. I then went on to ask them if they had the appropriate resistors available and, if so, what the cost would be. I also gave them my name, address and telephone No.
That's all I told them and they responded within 2 hours. They shipped the motor and resistor without further communications. I will check it out this weekend to make sure everything is "good to go" before I return my original motor to them. .
Mike
wannabefree wrote:That's true, a PWM can cause the fan to buzz because it is sending pulses to the fan, not pure DC. However, if the frequency is high enough you will never hear it and the fan won't know the difference between DC and pulses. This is a function of PWM design, and a well-designed PWM won't exhibit this problem. Ultimately the choice is yours. I'm comfortable with it because if it doesn't work right I can fix it. Not everyone is in that position. Nearly every modern power supply, from that running you TV to your microwave to charging your razor is based on PWM. How many people are complaining about it buzzing?
Just consider this an alternative to turning energy into heat.
wannabefree wrote:The voice of sanity and reason gets the last word!
Man, that was so much better than "shut up."
Larwyn wrote: Resistor, or PWM power supply will use more energy than the fan alone.
bluzharp wrote:Larwyn wrote: Resistor, or PWM power supply will use more energy than the fan alone.
No, either device will result in less power consumption from the battery except in the case of the PWM at 100% output (minus the parasitic load of the controlling circuitry which is negligible for all practical purposes in this application).
Not trying to start trouble, just adding some clarification.
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