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Old Sep 21st, 2007, 12:42 PM   #1
wuwei
 
 
Join Date: Jul 2007
Posts: 45
don't know which is better choice,please help, thanks-----

http://www.officedepot.com/ddSKU.do?...tk=all&An=text


http://www.officedepot.com/ddSKU.do?...tk=all&An=text
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Old Sep 21st, 2007, 01:11 PM   #2
sim03
 
 
Join Date: Jun 2006
Posts: 512
broken links
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Old Sep 21st, 2007, 01:16 PM   #3
wuwei
 
 
Join Date: Jul 2007
Posts: 45
sorry ....try these---

http://www.officedepot.com/ddSKU.do?...tk=all&An=text



http://www.officedepot.com/ddSKU.do?...tk=all&An=text
    Quote
Old Sep 21st, 2007, 08:24 PM   #4
number22
 
 
Join Date: Apr 2006
Posts: 1,368
I have smart-UPS 1000 for 5 years; have changed batteries every 2 years. Works great.

These 2 are too small in capacities.
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Old Oct 1st, 2007, 03:36 AM   #5
Arbitrageur
 
 
Join Date: Feb 2005
Location: Refco Trading Services, London
Posts: 263
two different types of technology.

Back-UPS is whats called an "offline" UPS - it means that its not doing anything much until theres a powercut - when the mains fails, a relay closes, the rectifier based battery charger reverses to become a basic squarewave inverter that creates a pseudo-sinewave output running from battery power to supply your computer.

Pro:
cheap battery backup.

Con:
minimal protection from spikes & power transmitted RFI.
no protection from brownouts or surges
50-100ms break in power during the switch between mains and battery

Smart-UPS uses "line-interactive" technology - it still means there is a relay in the circuit, so you still get a small break in power supply, but a Smart-UPS also incorporates a transformer that gives additional filtering for mains interference such as spikes & RFI, and it also can give boost/reduce by automatically tapping or removing another coil on the transformer to reduce the impact of brownouts or surges. They also give a sinewave output rather than squarewave.

Smart-UPS is by far the better choice of the two, but if you want full protection, you need to check out APC's "online" type UPS. More expensive, but they synthetically regenerate the mains sinewave giving you total isolation.
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