Environmental Engineering Reference
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public grid. The wind turbine delivers AC power with fluctuating
voltage and frequency. The rectifier (top left of Fig. 15.10) delivers
DC power to eight Surrette batteries, each of 250 Ah. The Trace
inverter (bottom left, Fig. 15.10) delivers 230 V, 50 Hz, AC power
of grid quality to the building.
Figure 15.11
The 2 kW Proven windmill installed at the Folkecenter. By
2012, it has been in operation for over 15 years without
repair and maintenance works, except for grease of the two
bearings every three years.
Figure 15.12
Procure 400 W: Installation on the roof of the office building in
2007 (left); Nacelle, blades and control are delivered in a box,
ready for installation. The mast is produced locally (right).
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