Just a couple of points really to register my interest in small scuba compressors and this very interesting great topic.
But first for fun. Sitting on my office desk is a very small oil free and oil less High Pressure 4500 psi bottle filling air compressors (That are capable of compressing from ambient air) and are available in both 12 and 24 and 28 volt DC Just no one has thought yet that the yacht market would be a suitable application.
The “bottle” you lot call “tanks” is the little round silver thing on the end of my finger and its purpose is, once filled to 4500 psi to be attached to a device that really does kill tanks.
I will hook it up filling a standard 80 and find out tomorrow how long it takes but I expect most of the working day.
I dare say I have a better cheaper solution we are working out for a client with a catamaran mounting the scuba compressor upside down hanging it from the ceiling in the engine compartment and has a similar requirement but not as interesting. But for now just to show there are small HP 24 volt compressors around.
The air intake filter is the small 28mm polyester white disc on the middle right side
The power socket is the small Anphenol socket lower left and the long silver and black
"coffee" flask under my hand is the HP zeolite filter assembly.
Weight is under that of a small dog 11 kilos (24 lbs)
Power wise using a 19 to 32VDC range and 28VDC nominal
Draw is 6 amps worse case (at 269 bar) and 10 amp for one (1) second on start
(Peak current on start up is 25 amps for 15 seconds when the gas heater is operative)
Current between 15 seconds and 2 minutes is 10 Amps Maximum
Current over 2 minutes and 39 minutes is 9 Amps maximum
Current after 39 minutes running drops to 6 Amps worse case
The gas heater current is 3 Amps at 28 VDC
Operational range sea level to 10,000 ft
Excursions to 20,000 ft
Survival Sea level to 60,000 ft (18288m)
(all in height altitude in case anyone is foolish enough to ask verification.
Attitude: Roll Pitch 30 degrees
Design philosophy is the same 3 stage swash plate principle as the more commercial SA-6 160 LPM 6 SCFM design just smaller.
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