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8) This describes the essential skills and knowledge and their level, required for this unit. Evidence must show that knowledge has been acquired of safe working practices and solving basic problems in stand-alone renewable energy systems. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. |
KS01-EK128A | Stand alone renewable energy system components |
| Evidence shall show an understanding of stand-alone RE system components to an extent indicated by the following aspects: |
| T1 ELV wiring and circuit protection for renewable power systems encompassing: extra low voltage (ELV) and low voltage (LV) circuits in a stand-alone or grid connected renewable power system and the regulatory restrictions regarding work at each level. earthing requirements for renewable power systems over a range of applications and environments required sizes for ELV cabling in a renewable power system, considering allowable voltage drops and cable current carrying capacity, in accordance with AS/NZS 3000 and AS 4509. Selection of suitable d.c. circuit protection and isolation for all relevant points in a stand-alone renewable power system, in accordance with AS/NZS 3000 and AS 4509 |
| T2 Electrical diagrams for a renewable power system encompassing: functional block diagrams for typical stand-alone renewable power system configurations. circuit schematic of typical renewable power systems supplying d.c. and/or a.c. loads, including all major components, protection devices, earthing, isolation, switching and metering unit wiring diagram for a typical renewable stand-alone power system d.c. control board architectural and site diagrams to show the locations of equipment, fittings and cabling |
| T3 Batteries encompassing: major features of each of the major types of commercially available batteries for stand-alone power system applications including basic chemistry, physical structure, advantages and disadvantages factors affecting the life of a battery processes of sulphation and stratification in lead acid batteries, their causes, effects and methods of prevention or reduction. effect of depth of discharge and of temperature on the capacity and life of lead-acid batteries. major specifications for a lead-acid battery in a stand-alone power system application. main features of charging regimes suitable for the major types of stand-alone power system batteries, using real examples. life of a standalone power system battery in years, based on manufacturer’s cycle life data and given capacity, configuration and operating conditions precautions required when handling, installing or maintaining lead-acid batteries. procedures required for safe disposal of the major commercially available types of batteries in accordance with AS 4509. |
| T4 Balance of system components and common loads encompassing: features of commercially available inverters suitable for use in stand-alone power systems. major operating parameters of an inverter, including d.c. voltage operating window; efficiency, output voltage waveform and output voltage regulation over a range of loads up to 5 minute ratings. problems that may be caused by non-sine supply voltage waveforms on typical loads, and the solutions used to overcome these significance of low power factor loads for inverter systems and the principle of power factor correction. operation of the major types of regulators for use in stand-alone renewable power systems, using commercially available equipment as examples. current vs. voltage characteristics, efficiency and charging voltage waveform for a transformer/rectifier type and a switchmode type battery charger suitable for use in stand-alone renewable power systems. operation of and applications for MPPTs for photovoltaic arrays. basic operation, advantages and disadvantages of mechanical tracking devices for PV arrays. control parameters or data using digital displays on inverters, regulators or controllers |
| T5 Basic lighting design encompassing: properties and features of the major lamp types including their suitability for use in stand-alone PV power systems. effect on room lighting levels, of luminaire design and positioning, décor, room construction and windows. Selection and sizing of suitable lamps and fittings and their placement in a household taking into account usage, lighting levels required by relevant standards and energy efficiency considerations. |
| T6 Generating sets encompassing: major components in the construction of a generating set main components of gas, petrol or diesel internal combustion engines basic principle of operation of internal combustion engines, including different fuel types and ignition methods. operating characteristics, advantages and disadvantages of gensets using different fuel types, aspiration methods, operating speed and number of cylinders. major methods of mechanical coupling and power transmission between an engine and alternator function and ratings of mechanical and electronic speed governing systems. basic structure and operation of an alternator. advantages and disadvantages of different types of excitation system and voltage regulation used for genset alternators. components and basic operation of a brushless excitation system in an alternator, and the principle of self-excitation |
| T7 Generator set sizing calculations encompassing: major electrical and mechanical ratings which control the performance of a genset calculations relating to real and apparent power, power factor, mechanical power, voltage regulation and speed droop for single phase gensets derating factor for a genset given manufacturer’s derating data and a given set of operating conditions. Selection of a suitable genset given maximum demand and surge loadings and derating factor. Calculation of the fuel consumption of a genset given manufacturer’s data and operating conditions |