30 Years of the Digest ... founded August 21, 1981
The Telecom Digest for November 6, 2011
====== 30 years of TELECOM Digest -- Founded August 21, 1981 ======
Telecom and VOIP (Voice over Internet Protocol) Digest for the
Internet. All contents here are copyrighted by Bill Horne and
the individual writers/correspondents. Articles may be used in other
journals or newsgroups, provided the writer's name and the Digest are
included in the fair use quote. By using any name or email address
included herein for any reason other than responding to an article
herein, you agree to pay a hundred dollars to that person, or email address
Addresses herein are not to be added to any mailing list, nor to be sold or given away without the explicit written consent of the owner of that address. Chain letters, viruses, porn, spam, and miscellaneous junk are definitely unwelcome.
We must fight spam for the same reason we fight crime: not because we are naive enough to believe that we will ever stamp it out, but because we do not want the kind of world that results when no one stands against crime. - Geoffrey Welsh
See the bottom of this issue for subscription and archive details and the name of our lawyer, and other stuff of interest.
Date: Sat, 05 Nov 2011 15:57:34 -0400 From: David Chessler <email@example.com> To: firstname.lastname@example.org. Subject: Emergency generators. Message-ID: <201111051957.BDY58190@mr17.lnh.mail.rcn.net> Some years ago we had a windstorm (or hurricane) that knocked out power for days--a week for some people. This is not an uncommon problem in Maryland and the Eastern shore. Summer thunderstorms can knock out power for days. Anyhow, the problem was getting power into the house to run the computer (I was on deadline at the time), the refrigerator, and maybe a light or two. I don't own a generator, and for events that happen only once or twice a decade, that seems an excessive expense. Then I remembered: I had two cars, each of which had a generator with battery backup. A quick trip to a nearby truckstop (if two counties away is nearby) and I owned two inverters. These cost about $100-125 each. (Truckstops are the most likely local sources, but Wal-Mart sometimes has them. Or, there is the internet.) I connected the one with the nominal rating of 1000 watts (continuous) to the battery of my Ford, which had the larger battery and generator, using large crocodile clips (like jumper cable clamps), and ran an extension cord into the house. I plugged in the refrigerator and "POWER". The one with the nominal rating of 750 Watts could not run the refrigerator, but attached to the battery of the Honda it did just fine on the computer and printer. I had the cars idling, so the batteries had a chance to recharge (IIRC, modern alternators deliver full power even at idle). There is no way this arrangement could supply full power to the house. I think the Ford had a 65 AMP alternator, which means 780 Watts at 12 volts, less the losses. However, the battery supplied any surge that the alternator could not. (When an electric motor, like the one in the refrigerator, starts, it draws perhaps double its usual load for a fraction of a second.) Electric stoves, air conditioners, electric heat just won't work with such small alternators, though you could probably run the fan in a forced-hot air furnace. This arrangement would also work for camping at events [or evacuations] where you can leave your vehicle reasonably close to your tent. ***** Moderator's Note ***** I don't know how to calculate the startup load of a refrigerator: you are right, of course, that the starting demand is much higher than the running power that's needed, but I'm not sure how to calculate it. I'm told that the worst case power-demand is from an air conditioning system, but I don't know why. If anyone has a pointer to an EPA or other site that gives the procedure, please send it in. I'm very interested in getting information about the running costs of various fuels, as well: I read that Natural Gas is much more expensive than gasoline. TIA. Bill Horne Moderator
TELECOM Digest is an electronic journal devoted mostly to telecom- munications topics. It is circulated anywhere there is email, in addition to Usenet, where it appears as the moderated newsgroup 'comp.dcom.telecom'. TELECOM Digest is a not-for-profit, mostly non-commercial educational service offered to the Internet by Bill Horne. All the contents of the Digest are compilation-copyrighted. You may reprint articles in some other media on an occasional basis, but please attribute my work and that of the original author. The Telecom Digest is moderated by Bill Horne.
43 Deerfield Road
Sharon MA 02067-2301
bill at horne dot net
This Digest is the oldest continuing e-journal about telecomm- unications on the Internet, having been founded in August, 1981 and published continuously since then. Our archives are available for your review/research. We believe we are the oldest e-zine/mailing list on the internet in any category! URL information: http://telecom-digest.org Copyright (C) 2011 TELECOM Digest. All rights reserved. Our attorney is Bill Levant, of Blue Bell, PA.
Finally, the Digest is funded by gifts from generous readers such as yourself who provide funding in amounts deemed appropriate. Your help is important and appreciated. A suggested donation of fifty dollars per year per reader is considered appropriate. See our address above. Please make at least a single donation to cover the cost of processing your name to the mailing list. All opinions expressed herein are deemed to be those of the author. Any organizations listed are for identification purposes only and messages should not be considered any official expression by the organization.