PO BOX 176 • AMHERST, WI 54406 715-677-4289
Back Issues of Home Power !
It contains an index of all articles back to issue #1
You can buy back issues individually:
• $4.75 each for #21 through #45 (except for #36)
Deal #1: All 39 available issues for $124 Deal #2:6 or more issues (of #21 through #53) for $4.00 each (sent bound printed matter). for U.S. ZIP codes only, see page 81 for international back issues.
(Sorry, we're out of issues 1 through 10, #12 , #14, #15 and #36). We are planning to compile them into a book. Until then, borrow from a friend. If you have a computer (or a friend with one) download the article you're missing by calling the Home Power bulletin board at 707-822-8640. Or check with your local library; through interlibrary loan, you can get these back issues. Jackson County Library in Oregon has all issues as does the Alfred Mann Library at Cornell Univ.)
Home Power, PO Box 520, Ashland, OR 97520 • 800-707-6585 • 916-475-0830 visa / mc
Needed: PV Volunteers for Africa.
Solar Energy International (SEI) is organizing volunteers trained in the design and installation of small stand-alone photovoltaic systems. This pilot program, a component of SEI's INVEST Program, provides selected volunteers with an opportunity to work with small African businesses and community groups. Participants will work under the direct supervision of Energy Alternatives Africa (EAA). The EAA is a leading African organization promoting PV rural electrification.
To support this charitable program, volunteers must make a one year commitment and be responsible for paying their travel and in-country expenses. The total amount a volunteer needs to provide for the entire in-country year is approximately $5,000. Additional funds will need to be raised by SEI and EAAto cover administrative costs.
Potential volunteers are required to successfully complete SEI's PV Training program (or equivalent) as a prerequisite. The full four weeks of intensive technical training will cost each participant an additional $1700 for workshop tuition. Volunteers have an opportunity to complete the required training this yearon August 5-August 30.
To find out more about EAA please see Home Power Magazine issue #41.
For background information about SEI please see Home Power Magazine issues @21, 31, 32, 49 & 50.
Solar Energy International
PO Box 715, Carbondale, CO 81623 970-963-8855, Fax 970-963-8866 • e-mail: [email protected] Homepage: http://soltice.crest.org/renewables/sei/index.html
Letters to Home Power
Dear Home Power Crew, I just finished reading John Dailey's article on the tilt-up tower he built for his new Bergey 850 wind generator (HP #52). John did a nice job adapting local materials to solve his tower problem. And your graphic detailing of the tower configuration is truly great!
A few comments about some specific details, however, are in order. John states that he used auger-type anchors for the tower, as are specified by the companies that offer commercially built tilt-up towers (see accompanying diagram). The anchor in the diagram on page 27, however, is a corkscrew anchor, the type used to tether a dog on a leash. Corkscrew anchors have good holding power when you pull on them horizontally, as a dog on a leash would do. They offer little resistance when pulled from a near-vertical direction, as would occur with a tower tugging on its guy cables. Corkscrew anchors are never recommended for anchoring towers.
From his photo of the hinge arrangement, it appears that John used a piece of water pipe as the hinge pin. Water pipe is rather easily bent, as anyone who has ever wrestled with old plumbing can attest to. A suggestion is to substitute a piece of solid round bar for the water pipe.
The text and diagram on page 27 specify a stub tower "3 or 4 feet tall". Today's small wind generators all sport thin flexible blades. As a result, clearance between the blades and the stub tower is critical. The base plate and gussets of the stub tower must be beyond the reach of the tips of the blades. If your blades flex back and strike the gussets, the blades are not covered by the manufacturer's warranty. This can be a very expensive mistake!
Finally, a note on three- versus four-guyed towers is in order.
Fixed guyed towers that do not move, like TV or radio transmitter towers, are anchored to the earth at three points 120° apart, the minimum you can get away with. Tilt-up towers, however, must be anchored at four points, 90° apart (see accompanying diagram).
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Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.