• Cascading UPSs

    From Don Y@21:1/5 to All on Mon Jan 6 14:22:01 2025
    I've a shitload of UPSs -- most in the office.

    Power *tends* to be pretty reliable, here, so they aren't
    used for their "backup" capability. However, we do tend to
    see "switching transients", predictably, at certain times
    of the day. So, having a "second" of carryover is often
    helpful (on the smaller machines; the larger ones have big
    enough power supplies that they can bridge these momentary
    outages)

    Instead, they tend to be "outlet multipliers" in much the
    same way as outlet strips might be (though a better form
    factor, given the layout of my kit). They let me connect
    all of the devices for a host to the UPS associated with that
    host. Then, power them all on/off at the same time.

    But, most importantly, it lets me get a feel for how much
    of a load I have on the mains -- so I don't carelessly
    add some new load that blows a breaker!

    Replacing batteries is a costly -- and time consuming -- exercise.
    A single "shared" battery would be the preferred solution. But,
    not possible with COTS UPSs (nor the associated IR drops).

    OTOH, I *could* plug more than one UPS into a single (or few)
    "master" UPS that effectively takes on the role of the mains
    connection. Then, I just have to keep that/those UPS running
    ("properly") to gain the benefits of bridging those brief glitches.

    Any downsides to this? If I remove the batteries from the
    "slave" UPSs (i.e., don't replace them when they fail), then
    I can avoid that maintenance issue but still retain the other
    advantages of the UPS-per-workstation.

    Or, maybe put some trivial "power source" in their place that
    is just enough to satisfy the UPSs' expectations of a "battery"?

    [I'd still have to put up with the "connect battery" messages
    but maybe I'll hack the firmware to "fix" that issue -- and,
    stop the silly scrolling of "screens" so I can just see the
    data of interest, constantly.]

    [[UPS manufacturers seem to have shitty/buggy/unfriendly software]]

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