They can reduce your utility bills similarly to grid tie systems. Grid-Tied systems with battery backup use special grid-tie inverters with an additional built-in transfer relay. Such batteryless configuration can be used if you are on grid or you have other sources of power.
HOME WIND ELECTRIC GENERATOR GENERATOR
This is a diagram of a typical wind-powered generator with a transformer-isolated output. In addition, it is required to automatically disconnect from your wiring in order to prevent backfeeding into "dead" utility lines. During power outage the inverter gets no reference voltage to operate. The frequency of the inverter in such a system is set by the power line. However contrary to common misconception, such a batteryless system will not provide any back up during blackouts even when there is a sufficient air flow. Whenever the power produced by the turbine is greater than your needs, the inverter will send the surplus to the grid. A special grid tie inverter synchronizes its operation with the mains. The energy they generate is fed directly into the household wiring, which reduces the electricity consumption from the utility. Grid-Tied setups are connected parallel to the existing electric service. To reduce their size, off-grid wind systems are normally supplemented by solar electric systems or by auxiliary generators that are fueled from diesel or propane tanks. Due to erratic energy flow from the turbines, the battery bank would have to be significantly oversized if your installation had no other power source. Since the wind turbines do not store energy and can generate electricity only when there is sufficient air movement, for continuous power flow to your home the generated energy have to be stored in the batteries. Stand-alone (or off-grid) systems operate independent of the electric utility grid. In general, there are three basic types of renewable energy power systems: Off grid, Grid-tie, and Grid-tie with battery backup. Therefore it requires much lower value of smoothing capacitance to produce DC output with a given amount of ripple. The reason wind systems usually use a 3-phase alternator is because rectified 3-phase voltage has ten times lower ripple factor than that of a single-phase circuit.
The conversion is done by a solid-state inverter, which operates as a switch mode power supply ( SMPS).
It has to be rectified and then converted into a regulated constant-frequency AC compatible with the utility power. This voltage is not usable directly by conventional household electrical appliances. The rotation of their rotor varies with air speeds and therefore produces AC voltage with variable amplitude and frequency. Most small wind turbines suitable for homes are horizontal axis fixed-blade three-phase permanent magnet systems.
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