David Wade <g4...@dave.invalid> wrote:
> Can anyone recommend a UPS that will run an ONT, Router and DECT base
> station during a power cut? DECT base is a pain as manual says it needs
> 5.5 volt so not sure types which supply 12, 9 and 5v will work.
Is that 5.5v DC or AC? Does it have a transformer wallwart (heavy lump
mains plug) or a switching supply (lightweight mains plug)?
If it's 5.5V DC, I'd try powering it from 5V - I'd guess it might be OK. If
it has a transformer DC supply it may be unregulated, in which there can be
significant variation in voltage due to load.
> Any suggestions as you how long will it power these for?
I'd guess the load would be about 10-20W.
The trouble with 'big' UPSes with lead acid batteries and mains sockets is
they're inefficient at very small loads like that, being more designed to
run a desktop PC for a few minutes until shutdown. I'd be looking at ones
with a DC output rather than going up to mains and down again. I think
there are lithium 'mini UPS' units that are worth looking at, or there may
be some 12V UPS units without mains outputs.
If it turns out you do need an exact 5.5V supply, a regulator down from 12V
or 9V is an option. They are available in basic modules that you adjust
with a voltmeter and screwdriver:
through to full units with a display and controls:
- search 'adjustable buck regulator' to find them.