PO filter cart will process  3200 c.f. of air.  In a Oceans 4.9 c.f.m. =294 c.f. per hour hence cart is  changed every 11-12 hours under most dry conditions of ambient environment based on filling Aluminum 80 c.f. cylinders that have appx. 500 psi at the start of the fill process. 

P31 filter cart will process 11760 c.f. of air.  In a DMT 08    8.4 c.f.m = 500 c.f. per hour hence a cart is changed  every 24 -26 hours under most dry conditions of ambient environment based on filling a Aluminum 80 c.f. cylinder that has appx. 500 psi at the start of the fill process. 

P41 filter cart will process 28,700 c.f. of air.  In a DMT 08   8.4 c.f.  = 500 c.f. per hour hence a cart is changed every 57-60 hours under most dry conditions of ambient environment based on filling a Aluminum 80 c.f. cylinder that has appx. 500 psi at the start of the fill process. 

P 2 filter cart will process 40,000 c.f. of air.     P2 Securus cart will process 67,000 c.f. of air.

The above is a general recommendation; refer to your instruction manual for the exact answers.

Common question related to small compressors powered by generators:

The formula used to determine compressor capacity is:       C = V/(Kp*T)  where:

C = capacity in SCFM (Standard Cubic Feet Per Minute Intake)

V = volume in cubic inches

Kp is a constant depending on operating pressure (.26 for 2000 psi)

T is the shooting interval in seconds

Gen set size needed for Bauer portables.    JrII-E1/115 2 hp 6.0 KW

 JRII E1/single phase 230 VAC/60Hz 3 hp 7.5 KW      Oceanus E1/single phase 230 VAC/60 Hz  5 hp  20 KW