When choosing a windmill, first of all they ask, the question is how to choose the power of the wind generator. This is one of the most important parameters of a wind turbine.
There are two types of operation of the wind generator with the network: 1) Supply of generated electricity directly to the network and 2) The generator works to charge the batteries. Each of these methods of connecting a wind power installation to the network has its advantages and disadvantages.
For example, with the first type of connection, it is necessary to withstand the frequency of rotation of the generator very clearly, and given that the driver is the wind, oh, how to do it is not easy. In addition, the Wind Generator should provide power with this second energy consumption, and what if the wind is too weak at the moment, or what is more offensive, the most suitable, and energy is not required? Of course, for large wind farms operating on a national-scale electrical grid, this issue has been resolved. But for wind turbines of small and medium power, and, especially, for private use, this method is not suitable.
But the second method of utilization of air flow is very suitable for wind turbines of low and medium power. And although additional equipment costs are required (battery, controller, inverter), but we save on the power of the wind generator. And the calculation is conducted not from the peak power consumption, but from the nominal power consumption (which is a plus). Also, thanks to the work of the wind turbine on charging the battery, it is easier to choose more optimal modes of equipment operation with higher efficiency. Also, this method allows you to fully use all the wind due to the constant charging of batteries.
So, what is the power to pick up a windmill? If the system is of the second type, then first of all it is necessary to determine the average monthly consumption of electrical energy in your home, by meter. Collect all receipts for the year, sum up the counted amount of electricity (kWh) and divide by the number of receipts. From here we find out how much energy you need within one average month. Then divide the resulting number by 732 (this is the approximate number of hours in 1 month), and get the required power in kW. It is worth being guided by this power (it is possible more) when choosing a wind generator.
Example 1. Your monthly average consumption of electrical energy is 200 kWh / month. Find the generator power.
200/732 = 0.273 kW, or 273 W, you can safely count on a 300 W generator.
Example 2. Your monthly average consumption of electrical energy is 350 kWh / month. Find the generator power.
350/732 = 0,478 kW, or 478 W, you can safely count on a 500 W generator.