Tanada wrote:I have been surfing around looking for a vertical axis residential turbine in the 1 to 2 kWe size range since my spouse and I discussed it earlier this week without much luck, any suggestions?
I haven't heard good things about the vertical designs. While I can't find the link at the moment I have read a review that said they were much less efficient that conventional designs.
Here is one link. http://blogs.scientificamerican.com/plu ... -failures/
While not directly addressing vertical designs, here is a bit on wind generators for sailboats. The entire two part review is behind a pay wall. If interested I can PM you more info.
Based on our research (including the most recent data that we’ll report next month), a large-diameter, three-bladed unit is a good choice if maximum potential output is a chief concern. Small-diameter units can’t be written off, however. If low noise, small size, and a low cut-in speed (for low wind areas) are your first priorities, these units have much to offer.
Three of the units in our most recent test & emdash;the Superwind 350, the Air Breeze, and the Kiss High Output&emdash;had best days of 88-115 amp-hour production. Worst days were less than 10 amp hours. This is enough, or nearly enough, to meet the average amp-hour requirements aboard a modern cruising boat fitted with a watermaker and refrigeration.
Despite these persuasive numbers, our evaluations and experience in the field indicate that relying on a single wind turbine for one’s primary energy source is not the most sensible way to optimize for efficiency, particularly while under sail, when the rocking motion of the boat further inhibits performance. Solar panels have no moving parts, are durable, and in many ways are better suited for a lifestyle that tends to follow the sun. With the assistance of today’s Multi Point Power Tracking Technology (See "Boosting Solar Panel Output," Chandlery, August 2006), a single, 80-watt solar panel can replenish as much as 60-80 amp hours on an ideal summer day. Wind turbines, in our opinion, should be regarded as a viable option for a cruising sailboat with high energy needs to supplement its solar panels, genset, or high-output alternator&emdash;not as the ultimate solution to onboard energy production. Next month, we’ll take a close look at the performance and features of each of the units.
Here is some more info. Much here (Practical Sailor) is not pay walled.
For most U.S. sailors contemplating investing in renewable energy sources for the first time, it makes sense to buy a solar panel before a wind generator. For about $700, you can buy a pair of 60-watt panels that can generate about 240 watt-hours or 20 amp hours (assuming four hours of peak sunlight). This won't cover the amp-hour requirements of a modern cruising boat, however. (To roughly convert a solar panel's watt rating to amp-hours per day, marine technical author Nigel Calder offers the formula: amp-hours per day at 12 volts = the panel's rated wattage ÷ 3.) Although wind generators can deliver more than double this output during a 24-hour period, many U.S. anchorages and marinas don’t have the consistently breezy conditions they require to reach their potential. That conclusion was borne out during our long-term test of five models on a hilltop in Rhode Island, a relatively windy U.S. location, during the mid-1990s. Testers then came to the dismaying conclusion that over the long haul, an average 50-watt solar panel would outperform the units we tested.
Results were different in 2007, when we simultaneously tested five wind generators through a breezy Chesapeake Bay winter. The results of that wind generator test (accessible only to subscribers) and an article on choosing a wind generator based on that test offer a more optimistic view of wind energy. As the results of the 2007 test demonstrate, in windy areas such as the Caribbean, wind generators can do a much better job of keeping up with the demands of 12-volt refrigeration, usually the biggest energy hog on a cruising boat.