Thanks Ian,
I've got ~20bottles in the current collection, old and brand-spankin' new.
We use 6~12 bottles/day in set-up & monitoring days and <6/week through grow-out phases. Perfect-world there'd be something at ~1cfm on some manner of quiet & high-efficiency motor (island= electricity is costly). It sounds like that last 1000PSI is excessive work/duration, as I'd thought it might be.
Larger machine is more noise, thus timing issues with work, sea, sleep, neighbours etc. and/or tank-changes at X-minute intervals. I'd prefer to go to bed and wake up to a rack of ready-to-go bottles but fully appreciate the risks with "set & forget".
(Amongst) my problem(s) is the down-time of compressors at dive-shops & Marine Park office (mechanical & professional), plus time, travel & traffic in drop-collect. Autonomy is becoming my general ethos with efficiency getting to be getting to more important than actual cost, though I'm still a wee start-up so up-front cost remains extremely relevant.
Steel banks only go to 2500PSI, no? Thus still need to let machine run at elevated PSI, then start machine to top-up before work-day or spring for the Haskel? I'm trying to not make yet another investment (in gear & importation, space, time, risks etc) if there's an option, though I appreciate that there's not much for options unless I take BRT's kind offer (thanks, but it'd strain the budget for now).
Thanks again,
Andrew