Rick Christian wrote on 7/12/2017 8:13 PM:
>
>    Hello rickman!
>
> 28 Jun 17 19:04, you wrote to me:
>  ri> I have a rather old UPS for keeping my Internet modem and router
>  ri> running when the power goes down.  When I have a Pi running, I just
>  ri> add it to the UPS.  The real killer is the monitor though, as it uses
>  ri> more than the 2 or 3 watts the other devices use.  Well, actually, the
>  ri> real killer is my WISP. If I lose power for 1 minute, they seem to
>  ri> lose power for hours or their equipment is whacked and has to be
>  ri> replaced again taking hours.  So I have better up time ratings than
>  ri> they do.
>
> I've got all things critical on AC UPS's.... I've maxed out the UPS's I have,
> for critical things... EXCEPT the situation with some Pi's..
>
> The critical stuff routers, switches etc.. is all set up for USP till the
> generator starts.. I need about 5 minutes max on that...
>
> For me taking and getting another AC UPS v. a DC UPS ie: these USB battery
> things... seems over kill

To me it seems perfect kill once you consider *all* factors.  A DC/DC UPS is
hard to find and is questionable how well it would work.  The AC UPS is a
slam dunk giving much more capability allowing other things to be added in
the future.  The DC UPS will likely cost several sawbucks and the AC UPS is
not much more and perhaps the same if bought on sale.  Who knows how long
the DC UPS will last and the AC UPS will last a decade, at least mine have.
In fact, the one I depend on the most has been around for 15 years and still
works.  I see Microcenter has one for only $37.


> AC UPS to power 3-4 AC to 5VDC USB adaptors.. the Pi's are all headless...
>
> At this point since it actually may be less headache to the option I
considered
>  first... Since finding any of these USB batteries that will charge and ouput
> 5VDC at the same time is more hit or miss.

Exactly.

--

Rick C

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