First off all I am a scuba instructor and have been scuba diving for 21 years. The last 14 years as owner of scuba diving store and also a compressor technician for Lenhart & Wagner, Bauer, Coltri and other brands.
As of the discussion on filling 200/300 bars, concerning filling time and filling rate. The first 100 bars are slowest then the pressure fills faster and faster. This due to the compressibility factor of air.
A higher pressure give higher temperature on the last stage butt the advantage is faster filling time if you don’t start on zero bar (for example 50 Bar left as many scuba centers recommend or demand).
method in boats (if one mount or have hydraulics) is to use a hydraulic ”engine” on the compressor run from a hydraulic output from one of the engines. If this is from the same you charge the battery
bank you can cower the to aspects in the same time.
As to heat a smaller compressor running on higher rpm
(then a bigger one) will eventually need to have a cooling
period if you will fill many bottles. Even a storage
tank need filling and at a scuba diving shop we can sound insulate and have that running at night but on a boat that will not be possible. And heat need to be vented from the compressor space.
At Lenhardt & Wagner GmbH
you will find the cooling
requirements for all deferent’s (size) compressors. Like a L&w 100 minute/liters need 660 M2 air for cooling with electrical motor
. A hydraulic system don’t need that much cooling though.
Concerning capacity if you cont on the bottles being 50 bars left on a 10 liters 300 bar bottle you need to fill 250 bars or 2.500 liters to fill it on a small compressor like Bauer Junior (100 M/L) you will need 25 minutes (and some more for venting filters every 10-20 minutes. That gives approx 6 hours filling time for 12 bottles. A 225 minute liters compressor will do the work
in approx 2 hours and 10 minutes (that is a big different and a lot less wear on the compressor)
A bigger compressor gives higher weight and more electricity (16 amps 1 face for the 225 for example) or bigger hydraulic system.
All in all it come down to ones need and how much money
one need to spend. But a good rule
is that a smaller system for many filling will cost you the same price
as a bigger systems, giving it a few years in the running, do to wear and replacements
My home page is Polardykk BodÝ AS
(sorry for a old fashion site, but I rather go scuba diving and work on repairs
then construct web pages hehe).