Originally Posted by Village_Idiot
Originally Posted by squeeze
related: someone gave me some 24V fans [aircraft or marine] long ago and I checked them recently on 12V to decide their usefulness for daBus - perfect speed at half voltage, very quiet and they'll last longer thumbs_up

Bill


Amperage and voltage are inversley proportionate if you reduce the voltage to a blower motor you are increasing the amperage the blower motor is using. This will cause the blower to die sooner not last longer. As an example:
If your blower motor is rated at 24v and used 10amps to run, it would require 20amps to run at 12v and the windings in the blower may tolerate it for a while, but not for long.

For any given resistance (in this case the blower motor), the current is DIRECTLY proportional to the applied voltage, If you drop the voltage from 12V to 6V, the current will be cut in half. Ohms law never fails!