I dont, its cleverly written allowing 2 different facts to be co located within one sentence so they seem linked but arent.
the startup speed is the minimum speed they can start working in, from experience once you get them past the cogging point similar turbines (wattage wise) produce about 5%-15% of their rated power at their start speed, they then ramp up to their optimal wind speed and then dont make any more power once the "magnetic" capacity of the alternator is reached
600watts at 7.5m/s should be achievable out of a 4 meter disc in nice clean airflow.
Personally I'm looking into VAWT in the 90cms range that I can stick on a sectioned pole similar to a clark mast. Couple of big heavy batteries to help anchor the base and 3 guy lines or stick the pole on Arkie. Realisitcally they're only good for a handfull of amps but its enough (based on the one I trialled) to run an engle, lighting and a small radio with a whisker over.
AU 600W 24V Lantern 5-Blades Vertical Axis Wind Turbine Generator+Controller 930114734068 | eBay


 
						
					 
					
					 
				
				
				
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					 Originally Posted by Red90
 Originally Posted by Red90
					

 
						
					 
					
					 
						
					
 
						
					 
				 
						
					
 
				 
						
					
 
			
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