UPS Madness

[Mickel]

Is it just me or does it seem crazy to everyone that a UPS takes, say,
12V from a battery, converts it to 240V AC through some fairly complex
electronics, just to have another set of electronics convert it back to
12V and below. Thoughts?

Cheers,
Michael

 

[terryc]

Is it just me or does it seem crazy to everyone that a UPS takes, say,
12V from a battery, converts it to 240V AC through some fairly complex
electronics, just to have another set of electronics convert it back to
12V and below. Thoughts?

There are plug-in replacements that replace the PC PS and will run
directly off the battery. So no swap over time, but you pay an extra 10%
in power to top up the battery(deep discharge lead acid)

http://www.mini-box.com/s.nl/sc.8/category.13/.f

Middle flashy one.

 

[John Tserkezis]

Is it just me or does it seem crazy to everyone that a UPS takes, say,
12V from a battery, converts it to 240V AC through some fairly complex
electronics, just to have another set of electronics convert it back to
12V and below. Thoughts?

It does actually make sense if you consider you need to deal with one
generic black box and interface it with many different types of other
black boxes, and expect all that mess to actually work.

Back in the early days, you could get a UPS in the shape of an internal
card, which fed power back into the system via the slots and existing
cables. But you were dealing with one base, and it was consistent.

Today, when you're dealing with an assortment of various power rails,
pretty much the only consistent single power source you have is that
240vac.


Your argument is certainly stronger when you're talking about laptops
in cars for instance. Why go from 12v, to 240vac, then 240ac down to
9-19vdc, when you could do that with one step with a DC/DC converter.
Or in some cases, I've read that some who have 12v input laptops plug
the car's electrical system directly into it. Too risky IMO, but people
insist on doing it...

 

[David Segall]

Is it just me or does it seem crazy to everyone that a UPS takes, say,
12V from a battery, converts it to 240V AC through some fairly complex
electronics, just to have another set of electronics convert it back to
12V and below. Thoughts?

I think it is understandable with a fairly specialised product like a
UPS. However, it seems _really_ crazy when the same principle is
applied to entire households. The increasingly popular use of solar
panels to provide power to a home full of low voltage lighting and
electronics cries out for a standard low voltage DC power rail.

 

[Adrian Jansen]

I think it is understandable with a fairly specialised product like a
UPS. However, it seems _really_ crazy when the same principle is
applied to entire households. The increasingly popular use of solar
panels to provide power to a home full of low voltage lighting and
electronics cries out for a standard low voltage DC power rail.

When you have a bunch of those awful halogen downlights running at 12 v
4 amps each, you quickly realise its much more efficient to run 240 volt
to each point than install a 12 volt bus. And how much of that
electronics runs at 3.3,5,6,9,12 or 15 volts ? Getting a standard for
all that diverse stuff seems unlikely.

 

[terryc]

I think it is understandable with a fairly specialised product like a
UPS. However, it seems _really_ crazy when the same principle is applied
to entire households. The increasingly popular use of solar panels to
provide power to a home full of low voltage lighting and electronics
cries out for a standard low voltage DC power rail.

I will stick with the common lead acid battery voltages thank you. Good
enough standard for me. However, as pointed out, that is all very fine
when everything is at the same point. When it comes to transmitting it
even a hundred metre, cabling losses start to make higher voltages
preferred. hence it is easier to go with the commonly available 240V gear.

 

[Sylvia Else]

My F&P washing machine was emitting a noise during its emptying cycle
that anyone here would recognise as meaning that the pump bearings were
worn out.

It turns out that the pump can be replaced without any tools whatsoever:
Unplug from the mains, disconnect the pipes from the taps, pull the
waste pipe out of sink and tip the machine on its side (access to the
innards is from underneath). Pull the two power lead spades off the
motor, press a plastic tab to let the motor/pump rotate in its mounting,
and it can be pulled out. Installing the new one is just the reverse.

I wish all repairs were that simple. Nice one F&P.

Sylvia.

 

[Sylvia Else]

My F&P washing machine was emitting a noise during its emptying cycle
that anyone here would recognise as meaning that the pump bearings were
worn out.

It turns out that the pump can be replaced without any tools whatsoever:
Unplug from the mains, disconnect the pipes from the taps, pull the
waste pipe out of sink and tip the machine on its side (access to the
innards is from underneath). Pull the two power lead spades off the
motor, press a plastic tab to let the motor/pump rotate in its mounting,
and it can be pulled out. Installing the new one is just the reverse.

I wish all repairs were that simple. Nice one F&P.

Sylvia.

Sorry, I didn't intend to for that to be a reply.

Sylvia.

 

[Ross Herbert]

:Is it just me or does it seem crazy to everyone that a UPS takes, say,
:12V from a battery, converts it to 240V AC through some fairly complex
:electronics, just to have another set of electronics convert it back to
:12V and below. Thoughts?
:
:Cheers,
:Michael


Not madness at all...

How else do you think you can source 240Vac power when the mains supply normally
used by the PC is not there? I suppose you could replace the UPS with a petrol
genset but other than that what options do you have?