Our 255-CZ, the 500W 330 RPM Wind Turbine Alternator that has been used in small wind turbines for over 5 years. This unit can be configured for use with a vertical axis wind turbine or a horizontal axis wind turbine turning at 330 RPM. The most popular configuration on our low RPM Permanent Magnet Alternator is an aluminium body with flange mounting on either the front or the back end covers which makes it a versatile choice for 500W wind turbine applications.