30 May '15, 3pm

2015 Residential Wind Turbine Buyer’s Guide

Thanks for your cogent comments, Jim. Folks should approach small wind with eyes _wide_ open. A couple of cautions: • Comparing PV and wind by rated wattage is not sensible. PV has a predictable output based on rated wattage if you know the peak sun hours and the appropriate factor. Wind rated wattage is at peak, and since wind is a cubic resource, there's no easy way to predict energy (kWh) output from peak wattage of a wind generator. You really need the average wind speed on the site and good data on the specific machine. So comparing "cost per installed watt" just isn't a sound comparison. What's needed is comparing cost per kWh delivered over time. • Short towers are absolutely the most common mistake in small wind. But be careful with statements about "optimal" tower height. It very much depends on the terrain, the machine, and the application. If money isn't an obje...

Full article: http://www.homepower.com/articles/wind-power/equipment-pr...

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