The battery based models of the Super Fans use a different motor than the solar direct fans; more appropriate to run at the voltage levels seen on battery banks. Battery based solutions allow the fan to operate at nighttime or in overcast weather.
The F20-B has been tested over a range of voltage levels to evaluate power consumption and air movement.
Air flow 1,600 to 3,200 cubic feet per minute
12 volt solar panel estimated operating performance 30 watts up to 1,600 CFM, 60 watts up to 2,300 CFM, 135 watts up to 3,000 CFM
Thermally protected brushless motor designed for 50,000 hours continuous duty
High performance airfoil structural reinforced plastic blades
Heavy duty powder coated steel frame
Frame dimensions 24.125 x 24.125 x 5.5 inches
Fan weight 15 pounds, shipping weight 20 pounds
For motor protection programmed with 5 minute automatic low light low amp restarts
Moderate over voltage and thermal protection
Increase fan speed and run time per day with higher wattage solar panels
Fan will not run in reverse
Manufactured in the USA
Two year warranty
As shown by the numbers, small variations at the 12 volt levels create a modest range of air flow volumes. At the higher 24 volt levels though, the motor is near maxxed out, with little variation in power consumption and air speed. For applications that don't need the full CFM volumes a speed control (A-FAN-CONTROL, sold separately) can be used to limit the CFM.
The F20-B motor has been successfully tested at voltages as low 11.5 volts, but may cease to operate at 11.2 volts or lower.
The best thing about the DC Super Fans is the brushless motor. Motor brush replacements were common on previous fans especially if they were run at high RPM’s. With no brushes the Super Fans will outperform other fans.
The F20-B is not intended for solar direct application or AC power of any kind.