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This report describes the results of long-term field evaluation of four horizontal-axis, upwind, small wind energy conversion systems (SWECS) configured in an application mode. The long-term field evaluation of these SWECS covers performance, reliability, maintenance, maintainability, and availability data. Results of these evaluations have proven SWECS to be a viable source of alternative energy, but they must be properly designed and maintained to operate in a highly corrosive marine environment. The SWECS require frequent preventive maintenance, depending on design and location, including corrosion control at least every 3 months. The following recommendations resulted from the field evaluations: (1) do not use sliprings and bearings, if at all possible; (2) use sealed and self-lubricating bearings; (3) ensure that the tower is guyed and hinged for easy maintenance; (4) as much as possible enclose all components exposed directly to the marine environment; (5) ensure that all controls are passive and fail safe; and (6) improve the programming of the synchronous inverter so that it matches generator impedance at all wind speeds. Keywords: Wind power; and Renewable energy sources.