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 installing and setting up LV grid connected photovoltaic power systems

All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies

KSEKA

Photovoltaic LV installations

Evidence shall show an understanding of LV photovoltaic array grid connection to the extent indicated by the following aspects

T PV array installation requirements encompassing

OHampS requirements and methods for working on roofs

common methods of roof construction rafters and tile battens and methods to ensure integrity of waterproofing

common types of roof mounted and freestanding PV array frame construction and methods of tilt angle adjustment

fixing methods for different roof types

array mounting methods for north orientation roof sections and nonnorth facing roof sections

aesthetic considerations in choosing an appropriate array location and type of mounting

the mounting and fixing methods for at least one type of commercially available building integrated PV product

T Electrical PV array installation requirements encompassing

methods used in wiring and connecting PV arrays as per the Australian Standards AS and AS

considerations involved in wiring of series connected PV modules in order to minimise power losses due to shading

PV array wiring diagram including the placement of blocking and bypass diodes

considerations involved in choosing the location of associated system equipment including regulators dc control board inverters and inverters for grid connected systems

cable route from PV arrays to inverters so as to minimise the route length

T System installation and maintenance encompassing

installation work on a PV power system in accordance with relevant standards and OHampS guidelines

correct isolation and shutdown procedures prior to carrying out maintenance tasks

routine maintenance tasks on PV arrays

required vegetation control to remove or reduce shading or soiling on a PV array

T Inverters encompassing

types of inverters used in grid connected systems

AS symbol for a low voltage inverter

the basic function of an inverter

simple block diagram of a typical inverter used in grid connected system

T Inverter operation encompassing

the basic principle of operation of a single phase inverter using switch analogue

the operation of an inverter bridge and halfbridge configuration

operation of a FET inverter

connection of a grid inverter and measurement of the inverter parameters for various loads

T Inverter characteristics encompassing

the characteristics which distinguish inverters suitable for grid connected photovoltaic array application from standard inverters

using waveform diagrams the function of PWM techniques in square wave modified square wave and synthesised sine wave inverters

output voltage waveforms for square wave modified square wave and synthesized sine wave inverters showing typical voltages and periodic times

the six essential inverter specifications

T PV grid connected system operation encompassing

block diagram of a PV grid connected system

operation of grid interactive PV systems including synchronisation safety feature power flow control passive and active antiislanding and metered energy for systems

schematic diagrams of common grid connected inverter circuit configurations including metering arrangements isolation and connection with respect to RCDs in accordance with AS

T Installation of grid connected inverters encompassing

major installation requirements for all system components which will ensure correct operation long life safety and ease of maintenance consistent with AS AS ASNZS and relevant OHampS guidelines

selection of a suitable location for the PV array inverter and other components at a given installation site in accordance with AS and AS and the considerations given in AS and AS

typical installation configurations for grid connection of energy systems via inverters

the function and operation of a grid protection device as specified in AS

array wiring plan for series connected modules to minimise power loss due to shading at a particular site

installation requirements for a grid connected system

labelling and signage requirements for switchboards supplied with power from grid connected inverters as set out in AS

the additional requirements for UPS systems as specified in AS

installation of a PV grid connected system

T System commissioning and maintenance encompassing

the isolation procedures required for grid connected inverters

relevant commissioning procedures including startup and shutdown procedures for grid connected inverter systems in accordance with AS

testing a grid connected inverter system for correct operation

location and rectification of an electrical fault within a PV arrayinverter and wiring

maintenance schedule for a grid connected PV power system

performing commissioning work on a PV power system in accordance with AS AS ASNZS and AS

This provides essential advice for assessment of the unit and must be read in conjunction with the performance criteria and the range statement of the unit and the Training Package Assessment Guidelines

The Evidence Guide forms an integral part of this unit It must be used in conjunction with all parts of this unit and performed in accordance with the Assessment Guidelines of this Training Package

Overview of Assessment

Longitudinal competency development approaches to assessment such as Profiling require data to be reliably gathered in a form that can be consistently interpreted over time This approach is best utilised in Apprenticeship programs and reduces assessment intervention It is the industrypreferred model for apprenticeships However where summative or final assessment is used it is to include the application of the competency in the normal work environment or at a minimum the application of the competency in a realistically simulated work environment In some circumstances assessment in part or full can occur outside the workplace However it must be in accordance with industry and regulatory policy

Methods chosen for a particular assessment will be influenced by various factors These include the extent of the assessment the most effective locations for the assessment activities to take place access to physical resources additional safety measures that may be required and the critical nature of the competencies being assessed

The critical safety issues inherent in working with electricity electrical equipment gas or any other hazardous substancematerial present a challenge for those determining competence Sources of evidence need to be rich in nature to minimise error in judgment

Activities associated with normal everyday work have a bearing on the decision as to how much and how detailed the data gathered will contribute to its richness Some skills are more critical to safety and operational requirements while the same skills may be more or less frequently practised These points are raised for the assessors to consider when choosing an assessment method and developing assessment instruments Sample assessment instruments are included for Assessors in the Assessment Guidelines of this Training Package

Critical aspects of evidence required to demonstrate competency in this unit

Before the critical aspects of evidence are considered all prerequisites must be met

Evidence for competence in this unit must be considered holistically Each element and associated performance criteria must be demonstrated on at least two occasions in accordance with the Assessment Guidelines UEE Evidence must also comprise

A representative body of work performance demonstrated within the timeframes typically expected of the discipline work function and industrial environment In particular this must incorporate evidence that shows a candidate is able to

Implement Occupational Health and Safety workplace procedures and practices including the use of risk control measures as specified in the performance criteria and range statement

Apply sustainable energy principles and practices as specified in the performance criteria and range statement

Demonstrate an understanding of the essential knowledge and associated skills as described in this unit It may be required by some jurisdictions that RTOs provide a percentile graded result for the purpose of regulatory or licensing requirements

Demonstrate an appropriate level of skills enabling employment

Conduct work observing the relevant Anti Discrimination legislation regulations polices and workplace procedures

Demonstrated consistent performance across a representative range of contexts from the prescribed items below

Install and set up grid connected photovoltaic power systems as described in and including

A

Reading and interpreting drawings related to and apparatus locations and circuit connections

B

Placing and securing system components accurately

C

Maintaining fire integrity

D

Connecting system components to comply with requirements

E

Dealing with unplanned events by drawing on essential knowledge and skills to provide appropriate solutions incorporated in a holistic assessment with the above listed items

Context of and specific resources for assessment

This unit should be assessed as it relates to normal work practice using procedures information and resources typical of a workplace This should include

OHS policy and work procedures and instructions

Suitable work environment facilities equipment and materials to undertake actual work as prescribed by this unit

These should be part of the formal learningassessment environment

Note

Where simulation is considered a suitable strategy for assessment conditions must be authentic and as far as possible reproduce and replicate the workplace and be consistent with the approved industry simulation policy

The resources used for assessment should reflect current industry practices in relation to installing and setting up LV grid connected photovoltaic power systems

Method of assessment

This unit shall be assessed by methods given in Volume Part Assessment Guidelines

Note

Competent performance with inherent safe working practices is expected in the Industry to which this unit applies This requires assessment in a structured environment which is intended primarily for learningassessment and incorporates all necessary equipment and facilities for learners to develop and demonstrate the essential knowledge and skills described in this unit

Concurrent assessment and relationship with other units

For optimisation of training and assessment effort competency development in this unit may be arranged concurrently with unit

UEENEEKA

UEENEEK125A

Solve basic problems in photovoltaic energy apparatus and systems

The critical aspects of occupational health and safety covered in unit UEENEEEA and other discipline specific occupational health and safety units shall be incorporated in relation to this unit

The critical aspects of occupational health and safety covered in unit UEENEEE101A and other discipline specific occupational health and safety units shall be incorporated in relation to this unit.