From: muratlanne@gmail.com   
      
   "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-Nor   
   ally/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.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)