Re: software or hardware raid?

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On Thu, Mar 2, 2023 at 9:42 PM Tim via users
<users@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> I have a UPS sitting next to me, right now, in pieces, which (half)
> died in a most peculiar manner:
>
> A burning smell was eventually traced to it.  There's no visible signs
> of burning, and no schematic available for the model, that I can find.
> A rather acrid smell, not one I'm used to with component failure, I'm
> beginning to suspect a large AC transformer.
>
> While running off the mains its output is a (too) low voltage, but
> still high enough for most switch-mode power supplies to run normally
> (i.e. the computer and monitor).  It has some kind of AC voltage
> regulation built into it to deal with under and over-voltage.  The
> AC supply was normal, at the time.
>
> But running off its battery it produces the full 240 volts it's
> supposed to.
>
If you read about normal UPSes they are not normally designed to run
100% duty cycle (ie on battery for days, or fixing up a low voltage
for days).  So if you run yours at say 40% load it will probably
survive under the higher duty cycle, but if you run it close to 100%
load and it gets into cleaning up low voltages the UPS electronics may
not survive long (ie if fixing the voltages for hours/days).

So if they end up running in that state for long periods of time
(either because of adding bigger batteries--my UPS came with 12AH
batterys but now has external 35AH ones) and/or extended low voltages
various components may burn out.

There is also a setting on at least some UPSes that you can change so
that it does not regulate the lower voltages (wider acceptable voltage
range) and accepts those voltages as ok. I have done that with both of
my UPSes because the default setting prevents the UPSes from charging
when on a small generator, and would if the voltages was low but still
good enough cause the UPS to keep fixing the slightly low voltages and
possibly burn out.
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