On Sat, 10 Mar 2007 10:14:47 GMT, Ron Hardin
wrote:

Has anybody tried getting longer run times from UPS's by plugging
one UPS into another?

Power goess off, the first UPS goes on batteries, and runs everything.
When it quits, the second UPS senses it and goes on batteries, and
runs the computer.

And so indefinitely if you add more UPSs to get more runtime.

It seems it me it would work except possibly :

(1)The UPSs might not like the non-sinewave output of the first UPS, and
(2)I don't know what kind of current they draw if they decide to
recharge their batteries from an outer UPS. (This would suggest it's
wise to unplug the outer UPS when the power goes off so nobody
tries to recharge.)

Why not just take the battery out of the 2nd one and put it in
parallel with the battery in the first one? It would be more
efficient.

David wrote:


Why not just take the battery out of the 2nd one and put it in
parallel with the battery in the first one? It would be more
efficient.

It would be, but there's a catch. When the time comes to recharge the
now much bigger battery, the original charging circuit probably couldn't
handle the extra current. The greater the plate area, the more it starts
looking like a short circuit as far as the circuitry goes.

Most things being now built are made down to a cost instead of up to a
quality standard.



mike

On Sun, 11 Mar 2007 01:27:50 GMT, m II wrote:

David wrote:


Why not just take the battery out of the 2nd one and put it in
parallel with the battery in the first one? It would be more
efficient.

It would be, but there's a catch. When the time comes to recharge the
now much bigger battery, the original charging circuit probably couldn't
handle the extra current. The greater the plate area, the more it starts
looking like a short circuit as far as the circuitry goes.

Most things being now built are made down to a cost instead of up to a
quality standard.



mike

I've done this succesfully. I'm guessing the current is clamped, but
the Triplett kept 3 big-ass batteries charged in a microwave shack.

www.devilfinder.com APC Model 1000

is what I use.My Velocity Micro ProMagix tower computer and NEC
Multisync 22 inch flat screen CRT computer monitor are power hogs.When
the power goes out here due to stormy weather,I shut my computer down
and wait a while.Sure,laptops don't use much power,but I have no
need,nor do I want a laptop computer.
cuhulin

www.devilfinder.com How to hack your APC Model 1000

Port Zoobie!
cuhulin

David wrote:
On Sun, 11 Mar 2007 01:27:50 GMT, m II wrote:

David wrote:

Why not just take the battery out of the 2nd one and put it in
parallel with the battery in the first one? It would be more
efficient.
It would be, but there's a catch. When the time comes to recharge the
now much bigger battery, the original charging circuit probably couldn't
handle the extra current. The greater the plate area, the more it starts
looking like a short circuit as far as the circuitry goes.

Most things being now built are made down to a cost instead of up to a
quality standard.



mike

I've done this succesfully. I'm guessing the current is clamped, but
the Triplett kept 3 big-ass batteries charged in a microwave shack.


You obviously have better taste in the UPS systems available. I tried a
large 12V sealed lead acid battery once and the charge circuit DID melt
down. I was heartbroken. My visions of a two day standby time were crushed.

The small Tripp Lite I have now is acting up. The relay used to transfer
standby power over doesn't work anymore. In all fairness it is an
older 450 VA model, so I should really look around for a new one.

I should also do a complete back up...today...right...today..



mike

Buy a new battery back up device.Tripp Lite,APC,or whichever brand name
you prefer.When the batteries (I think my APC Model 1000 has two
batteries) in my batttery back up get too worn out,I will go to a local
computer store and buy a new one with new fresh batteries in it.I won't
mess around.By the way,I get snail mail APC pamplets in my snail mail
box,whenever APC company sends them out.I guess a www.devilfinder.com
for,APC News Letters might turn something up.
cuhulin