Dave Liquorice wrote:

Andy Burns wrote:

a UPS generally does consume a background amount of power, how else do
they cook their batteries with heat?

My APC Smart UPS 700 doesn't any more.

I did a minor adjustment with the "hidden" serial command, can't
remember the exact float voltage I set 27.something, whatever the Yuasa
spec said, even though they're not Yuasa batteries in it.

Mine has 4 of the 18Ah batteries and now the electronics lump at the top
of the case still gets warm (it's often running in buck mode) noticeably
above ambient, but the battery lump at the bottom of the case is nowhere
near as warm.


The Friday cut and the much
longer one the follwoing Mondy proved that the mods I have made to it
have stopped it killing its batteries.

It used to kill a set of batteries in around 4 years.

Mine were last changed july 2015, I no longer do the weekly test, but
they worked last time I checked.

After the last
lot almost went into literal meltdown

Only seen that when someone had fitted "alarm" batteries, rather than
"NP" batteries.

At a rough guess I'd say mine takes 15 W +/- 5 W.

I think mine was about 30W for a SU2200 plus the same again for an 8 way
smart PDU, but then I realised I didn't exactly need to remotely
power-cycle individual kit, so I no longer use that.