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� <br /> Tilt-down towers can also be low- application,the balance of system <br /> ered to the ground during hazazd- parts may include a controller,storage <br /> ous weather such as hunicanes. batteries,a power conditioning unit <br /> Aluminum towers are prone to (inverter),and wiring.Some wind <br /> cracking and should be avoided. turbine controllers,inverters,or other <br /> Most turbine manufacturers provide electrical devices may be stamped <br /> wind energy system packages that by a recognized testing agency,like <br /> include towers. Underwriters Laboratories. <br /> Mounting turbines on rooftops is not Stand-Alone Systems <br /> recommended.All wind turbines Stand-alone systems(systems not <br /> vibrate and transmit the vibration �ected to the utility grid)require <br /> to the structure on which they are batteries to store excess power gener- <br /> mounted.This can lead to noise and ated for use when the wind is calm. <br /> structural problems with the building, �ey also need a charge controller to <br /> and the rooftop can cause excessive keep the batteries from overcharging. <br /> turbulence that can shorten the life of D���,�e batteries,such as those <br /> the turbine. used for golf carts,can discharge <br /> Balance of System and recharge 80%of their capacity <br /> The parts that you need in addition hundreds of times,which makes them <br /> to the turbine and the tower,or the a good option for remote renewable <br /> balance of system pazts,will depend energy systems.Automorive batteries <br /> on your application.Most manufac- are shallow-cycle batteries and should <br /> turers can provide you with a system not be nsed in renewable energy <br /> package that includes all the parts you systems because of their short life <br /> need for your application.For exam- 'n d�P'�Y��B operations. <br /> ple,the parts required for a water <br /> pumping system will be much differ- <br /> ent than what you need for a residen- �!� <br /> tial application.The balance of system <br /> required will also depend on whether <br /> the system is grid-connected,stand- 9 �i '„ <br /> alone,or part of a hybrid system. <br /> For a residential grid-connected <br /> A Bergey XL.10, <br /> 10-kW wind <br /> turbine is part of <br /> a grid-connected � <br /> wind/photovoltaic <br /> hybrid system that N � <br /> reduces the utility ' <br /> power used by this <br /> home in Vermont. p <br /> The balance of � <br /> system(upper right) � <br /> includes from left � <br /> to ripht,a Trace � <br /> inverterforthe <br /> PV system,a � <br /> breaker box,and a � <br /> Powersync inverter <br /> for the wind system. <br /> � <br /> � <br />