Posted by Jim Wilkins on December 29, 2010, 11:32 pm
When I was collecting and fixing the second-hand UPSs I worked for a
former [big name in UPS] engineer, who told me specifically what they
could and couldn't do. Generally he agreed with you, saying that the
low-end ones at least were engineered for least cost and shouldn't be
pushed beyond their ratings by connecting an external battery.
I normally use them as intended, to keep the TV recording computer on
if the power glitches for instance. If we have a longer outage I run
small fluorescent room lights or this laptop from them, before digging
out the bigger stuff that -will- last for many hours. The small
internal batteries are enough for a light that's on for a minute a few
times a day, as long as they are shut off in between. The Newpoint,
Conext and Tripplite will turn on without AC connected.
No, they aren't good or economical general-purpose AC power sources
beyond having one or two for hands-free emergency lighting without
extension cords on the floor.
Posted by David Lesher on December 30, 2010, 2:23 am
I have an antique Smartup 900 1250. It is fan cooled. I put a
pair of 55AH deep cycle batteries on it. It would last for ~24h
on my loads when they were in good shape (and take a week to
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Unless the host (that isn't close).........................pob 1433
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Posted by danny burstein on December 30, 2010, 2:46 am
Wasn't that your home we saw still powered up when the
whole region was blacked out in Die Hard IV ?
Knowledge may be power, but communications is the key
[to foil spammers, my address has been double rot-13 encoded]
Posted by Jim Wilkins on December 30, 2010, 2:06 pm
I have an assortment of second-hand stuff that works well, but I can't
suggest that as a general solution. For people who aren't electric
vehicle battery techs a UPS or inverter+battery pack is a self-
contained AC power source without exposed high-current wiring.
Personally I put big Anderson connectors on deep-discharge batteries
"No longer produced"
Posted by Bruce Gordon on December 23, 2010, 10:42 pm
Speaking as one who generates ALL my own power, this is how we do it
around here. 20 Kw diesel gensets, Trace Inverter/chargers and BIG
Battery banks made from folklift Batteries. Gensets run 10 hours a day.
(7Am to noon, and 5 Pm to 10Pm) Keeps the Freezers cold, the Batteries
charged, the Telco system online and ISP hardware up and running
24/7/365. We do laundry and dishes when the Genset is running. This has
worked for us, for 3 decades.... YMMV.....
Bruce in Alaska add path before the @ for email