Power Vent Installation Instructions

(Refer to power vent installation diagrams)

The POWER VENT must be placed vertically with the label right side up in order for the backdraft damper to function properly.

Place the POWER VENT higher than the top of the battery box and indoors, especially in cold climates.

Use no more than four 90º bends including one at the exterior terminus facing down. Put a screen on the outside pipe terminus to keep insects and debris out. If installed in a dusty or construction environment put a porous foam or paper filter on the battery box inlet. DO NOT glue the Power Vents in place. Friction fit is adequate. DO NOT drip glue onto the fan blades.
Use 2″ PVC dwv pipe on 12 and 24 volt systems. Use 2″ intake and 3″ output PVC dwv pipe on 48 volt systems.

Place a 1 amp fuse at the start of the positive circuit wire. Thermostat wire and phone splice/tap connectors (ULG or UG)) work well to connect the Power Vent. Use a cable tie around the base of the Power Vent and wires to provide strain relief and create a neat wire job

A control is usually used in the circuit to cycle the fan . Many inverters and charge controllers have a 12 volt powered auxiliary relay available. Other inverters may or may not have a voltage controlled auxiliary relay and some have an adjustable output voltage. Please refer to the appropriate manual for hook up and programming instructions. The voltage set points for turning the fan on and off are above the full state of charge voltage of the battery but below the battery gassing voltage. In the case of grid tied systems where the batteries are kept at float voltage 24 hours/day it may be necessary to run the fan full time as the batteries are always gassing. An alternative is to remove the backdraft damper to allow passive venting and only switch fan on when batteries are above float voltage.

For the inquisitive, please note that the 48 volt Power Vents are built with two 24 volt fans wired in series.


(Trace inverters)
 12  13.2 VOLTS  13.0 VOLTS  0.2
 24  26.4 VOLTS  26.1 VOLTS  0.3
 48  52.8 VOLTS  52.2 VOLTS  0.6


This vent only moves a small volume of air. It is designed for home systems with typical charging capabilities of 150 DC amps or less. Hydrogen gas creates an explosion risk at concentrations of only 4%. Make sure vent openings are free and clear including safety vent hole at the bottom of the POWER VENT. Periodically check to make sure fan is running during charge periods. Keep your batteries and connections clean and tight. During equalization charges on large systems provide additional ventilation. Having no control over the use or installation of this product, we assume no liability connected with its’ use. The Power Vent itself is warrantied for 2 years if installed in accordance with these instructions.