Displaying 5 results from an estimated 5 matches for "headlamp".
2015 Dec 28
3
Server not shutting down before power loss
Hi I hope someone can please help.
I have an Ubuntu Server running 14.04.3 LTS and using an APC ES550 UPS
connected via USB.
I've installed Nut and can see it does monitor the UPS correctly and give
the correct stats with battery percentage etc.
But on doing a "real" test and unplugging the UPS from the power supply,
after watching the battery drop slowly suddenly the server just
2015 Dec 29
0
Server not shutting down before power loss
...d over years in archives,
first disconnect batteries & check voltage of each battery, - dead easy,
Then much more important: calculate internal resistance of each battery.
Batteries go bad after some years, even on trickle charge.
Measure voltage drop when driving a load such as 1 or a few car
headlamp bulbs in parallel. Then its simply Ohms law V=IR,
If voltage drops from say 13V to 11V & if you use 1 headlamp that
uses maybe 4 amps, then 13-11 / 4 = 2/4 = 0.5 which is on high side,
you dont want higher, better 0.3 or less.
Your UPS for PC's will prob. want a lot more than 4 amps, so l...
2015 Dec 29
2
Server not shutting down before power loss
...; first disconnect batteries & check voltage of each battery, - dead easy,
>
> Then much more important: calculate internal resistance of each battery.
> Batteries go bad after some years, even on trickle charge.
> Measure voltage drop when driving a load such as 1 or a few car
> headlamp bulbs in parallel. Then its simply Ohms law V=IR,
>
> If voltage drops from say 13V to 11V & if you use 1 headlamp that
> uses maybe 4 amps, then 13-11 / 4 = 2/4 = 0.5 which is on high side,
> you dont want higher, better 0.3 or less.
>
> Your UPS for PC's will prob. want...
2023 Oct 28
1
My Back-UPS RS 1000 went haywire, any ideas?
Is the battery old? PbAc ones usually last for 2-3 years and then degrade.
Should be a field-replaceable part.
Some 20 years ago I had an APC BackUPS become a glorified power strip every
few years, so when the wall power disappeared - load went down immediately.
It was also beeping about battery replacement (but in the closet, was not
often noticed quickly). This is also a way for you to check if
2001 Nov 13
6
Cannot install/run very important application
Hello everybody!
I've got a big problem: In my small business I use a Home-banking
software which I got
from my bank. Using it for many years now, it became very very important
for me.
Needless to say, it's a Windows software. Up to now, it was a Win 3.1
software which ran inside the Windows-Box of my ancient OS/2-PC. (The
only reason
why I still have this PC runnig OS/2).
This summer I