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From: "Jim Wilkins" <muratlanne@gmail.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: I Quit
Date: Fri, 5 Jul 2024 17:57:59 -0400
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"Bob La Londe"  wrote in message news:v69l0s$3e65q$1@dont-email.me...

If I could get all the tiny little losses eliminated I'd be tempted to
use both tanks for air storage, and just periodically switch which
compressor fills them. Then even if a compressor failed it would carry
the air seals for hours.

I also considered some sort of auto backup.  The easy way would be to
set the backup compressor to switch on at a lower pressure, but there
are a number of small issues that could cause both compressors to run at
the same time.  That's power I do not always have.  I never intended to
have a working machine shop.  This was just supposed to be a warehouse
for my contracting business.  I only have a 100 amp sub panel feeding
everything.  I know.  I know.  Upgrade the sub panel.  The house only
has a 200 amp main, and my wife wants to run electric demand heaters.
I'll have to upgrade the house main first.
Bob La Londe

-----------------------------------

I have one of these on my refrigerator as part of a plan to add load sensing 
to a true sine UPS with high idle current draw. It powers itself from the 
current sense coil, whose output lights the red LED and turns on the output 
MOSFET.
https://www.amazon.com/Current-Adjustable-Sensing-Flameproof-Normally/dp/B0CX89X32D

It or a higher rated one could control a contactor that disconnects the 
backup compressor when the main one's motor is drawing current, even if the 
belt is broken.