I would like to learn more about large-scale UPS systems, particularly the battery strings used in traditional RBOC/Telco applications. These are the sort of beasts that use huge strings of 6V 220aH deep cycle batteries, or even large numbers of 2V 400aH batteries on very strong earthquake-resistant shelving wired up to create a 48V mega-battery. Can anyone point me to the most definitive reference materials on the subject?
posted by thewalrus on Dec 17, 2009 - 4 answers

Is it safe to swap the power adapter attachment between an iBook G4 and an intel MacBook? [more inside]
posted by ndicecco on Oct 14, 2009 - 4 answers

My sister and brother-in-law have a large (12) and growing number of desktop boxes at home. They're rightly concerned that they're putting a strain on the electrical circuits they're using. What should they be asking an electrician to do to set them up correctly? [more inside]
posted by skyscraper on Jul 11, 2009 - 10 answers

Construction electrical: why is this service panel on sale at more than an 80% discount? [more inside]
posted by XMLicious on Mar 16, 2009 - 5 answers

After the recent issues with running a gas generator for emergency power backup, I was going to make the plunge and purchase a propane generator. The question is, should I plan on having a couple propane appliances installed as well? [more inside]
posted by inthe80s on Dec 23, 2008 - 10 answers

Electrical engineering / voltage regulatorfilter: I'm searching for manufacturer or vendor sources on high quality, 220V to 240V automatic voltage regulators. This is for use with telecommunications/GSM/ISP equipment in the third world. Any other advice related to the subject will also be greatly appreciated. [more inside]
posted by thewalrus on Oct 10, 2008 - 1 answer

Dead battery--is there a problem with my car? [more inside]
posted by phoenixy on Sep 13, 2008 - 12 answers

What can cause a house's lights to dim and flash? [more inside]
posted by Nelson on Sep 8, 2008 - 7 answers

Where can I find this 40-some-year-old power cord? [more inside]
posted by ethel on Feb 16, 2008 - 7 answers

British appliance, US power: can they find happiness together? [more inside]
posted by bac on Dec 9, 2007 - 15 answers

Anyone know a simple and cheap solar panel setup to run a small boombox about 9-12V DC? [more inside]
posted by Bengston on Dec 4, 2007 - 3 answers

Any electricians out there? How can a household circuit *halfway* stop working? I am confused. Details inside. [more inside]
posted by Lokheed on Oct 26, 2007 - 13 answers

2 outlets & a ceiling light stopped working at the same time. None of the circuit breakers were flipped. What would cause this, and how can I troubleshoot it? [more inside]
posted by designbot on Aug 30, 2007 - 15 answers

Calling electricians: can I use one of those "battery chargers" they sell at Auto Zone to power a small appliance that needs 12V? [more inside]
posted by hodyoaten on May 26, 2007 - 13 answers

I got into a debate the other day with my boss, who is absolutely anal-retentive about everything power related (to the point where he scolds me for leaving fluorescent lights turned on if I'm not using the room). [more inside]
posted by melorama on Nov 11, 2006 - 17 answers

What are the characteristics and drawbacks of 208Y power? Specifically will it run my industrial sewing machines that want 220v? [more inside]
posted by Jawn on Nov 1, 2006 - 10 answers

If i want to install electrical appliances, drawing upto 6kw, in a van how do i go about this? [more inside]
posted by thegeezer3 on Aug 23, 2006 - 10 answers

ElectricalFilter -- please help me identify this mystery panel in the wall of my old apartment! [more inside]
posted by potsmokinghippieoverlord on Jun 22, 2006 - 15 answers