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[–] thrus ago 

So if they break down a bit more then once every two years, preventative maintenance is what every 6 months? I understand it is nice to have the work be easy to do, but if downtime is 1% and uptime is 99% it seems logical to make the uptime a bit more efficient (2 blades) rather then shortening the downtime (time to stop with the brakes) by a small amount. Especially if the main advantage of the single blade design is in wear on the brakes as that accounted for 0.6 days worth of downtime per year according to your site, where as efficiency in the blades would add to the power output offsetting that cost.

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[–] Grospoliner 1 point -1 points (+0|-1) ago 

Optimistically maybe 6 months, but companies are going to run inspection and maintenance schedules at whatever they decide them to be (leading off of construction time being the most logical), and you can never perfectly account for the randomness of component failure (electrical or mechanical).