Low-cost wind power battery charger

Small wind powered generators are useful devices for people dependent on battery power, such as caravaners and yachtsmen. Commercial products are expensive. The smallest models cost over E250. A generator giving up to 30 watts Output can be made using a permanent magnet radiator fan motor, obtainable from a car breaker, costing about E5, a DCDC converter, described here, costing less than E15, and an 800-mm diameter wooden propeller described by Mr. Piggott.