I have half a dozen of them, and they're not consistent. He's also at about 3700ft elevation, so he's already taking a hit due to lower air density.ĪND he's using a cheap watt meter. There is an absolute limit to the amount of kinetic energy in wind. I'm not seeing that he's verifying his claims with a second source. First, he's estimating wind speeds based on what Weather Underground is reporting. Will follows a reasonably scientific process. What is more, due to the way grid-tie inverters work, you are about as likely to be loosing energy around cut-in wind speed to keep the inverter powered, as you are in making any energy, resulting in a net-loss of electricity production.ĭon't insult Will. That same turbine would be rated at 6 kW (or more, see the next section), so energy production at cut-in really is just a drop in the bucket. To give you some idea, a wind turbine with a diameter of 6 meters (pretty large as small wind turbines go) can realistically produce just 120 Watt at 3.5 m/s wind speed. While it may make you feel good to see your expensive yard toy spin, it is not doing anything meaningful in a breeze like that: There is no energy in the wind at those wind speeds, nothing to harvest for the turbine. For most wind turbines it is around 2.5 – 3.5 m/s (5.5 – 8 mph), and it is an utterly meaningless parameter. Depending on whom you ask, the cut-in wind speed is either the wind speed where the turbine starts turning, or the wind speed where it starts to produce some power. I often see people post questions on forums, where they are looking for a wind turbine “with a low cut-in wind speed”. 3 foot diameter turbine can make 160 watts rated power at 25 mph winds
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