Solar photovoltaic systems and battery storage

Rooftop solar photovoltaic (PV) systems convert energy from the sun into electricity you can use in your property. Any electricity you don't use gets fed into the main electricity grid.

Large-scale batteries can be connected to solar PV systems to store energy generated during the day. This energy can be used at night or in poor weather when the system isn't generating much energy.

Using the electricity generated by a solar PV system during daytime hours means you don't need to buy as much electricity from the grid, which can help lower your electricity bills. Where possible, align your electricity consumption, like running clothes washers, dishwashers, or heating and cooling, to times when your solar generation is highest, rather than running them at night when you have to buy electricity from the grid.

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    South Australia's Home Battery Scheme

    The Home Battery Scheme gives all grid-connected South Australians access to state government subsidies and low-interest loans – provided by the Clean Energy Finance Corporation – to help pay for a home battery system and new solar if required.

    The subsidy is available to all South Australians, and calculated on the kilowatt hour capacity of the battery purchased. Furthermore, Energy Concession Holders are eligible for a higher subsidy, ensuring low-income households are supported to access the Scheme.

    While the subsidy is applied to the battery component only, participating households can apply for finance available through the Commonwealth Government’s Clean Energy Finance Corporation, to help pay for the balance of the battery and to purchase new or additional solar panels if required.

    The subsidy is calculated on the kilowatt hour capacity of the battery being installed.

    Home Battery Scheme subsidy levels

    The subsidy levels of the Home Battery Scheme will decrease over time as uptake of the subsidy increases, starting from 15 April 2020.

    Subsidies that are conditionally approved before Wednesday 15 April 2020, will be eligible for the Step One subsidy. Subsidy applications lodged on Wednesday 15 April onwards will be subject to the Step Two subsidy.

     

    Step One Subsidy

    Effective 29 Oct 2018 – 14 April 2020

    Step Two subsidy

    Effective 15 April 2020

    Energy concession holder

    $600 per kilowatt hour

    $400 per kilowatt hour

    All other households

    $500 per kilowatt hour

    $300 per kilowatt hour

    Maximum subsidy per battery installation

    $6,000

    $4,000

    A set of minimum technical requirements for battery systems is in place to ensure the batteries are safe, reliable and capable of being linked into a virtual power plant.

    The ability to aggregate home battery systems - either now or at a future point in time - creates opportunities to address network issues and smooth loads by balancing out peak power demands.

    Households are able to choose whether or not their home battery system operates as part of a virtual power plant.

    Further information

    The dedicated Home Battery Scheme website will help you decide if a home battery system is suitable for you, and to choose between approved products and system providers, access the subsidy and apply for finance, if required. You can also phone 8463 3555 for more information

    Virtual Power Plant

    In 2018 Tesla, with support from the State government, unveiled South Australia’s Virtual Power Plant. The program was designed in phases to demonstrate the viability of a virtual power plant to reduce energy costs for households and support the energy grid in ways that could reduce energy costs for all South Australians.

    The trial phases involved 1,100 Housing SA properties being fitted with solar and battery storage systems. All installations under the trial phases were completed in 2019. Tesla and the Government are now evaluating the trial phases and future options for the project.

    To learn more about a range of virtual power plant programs available in South Australia you can read summaries of current programs on the Join a VPP page of the Home Battery Scheme website.

    Choosing and installing a solar PV system or battery

    The best solar PV system or battery for your situation will depend on a number of factors, including:

    • how much electricity you use and at what time of day
    • how much roof space is available
    • the direction and orientation of panels.

    To work out what solution is best for you, speak with a reputable solar or battery installation company that uses installers accredited by the Clean Energy Council.

    The person installing a solar PV system or battery must be a licensed electrician. Check if your electrician is licensed in South Australia by searching the licensing public register.

    For help understanding your options:

    Understanding your home energy use can help you calculate the effect of a solar PV system on your energy bills, and help you work out if battery storage is an economical choice for you.

    Positioning your solar PV system or battery

    Solar PV panels produce most power when they are pointed directly at full sun between 9.00 am and 3.00 pm:

    • Make sure there's no shade on the panels. Even shade from things like trees, roof ventilators or antennas on just one cell will result in a loss of power from many cells. This will have a large impact on the output of a panel, due to changes in the flow of electricity through the panel.
    • To produce the most electricity, the panels should face north or, if that’s not possible, be spread over both east and west areas.

    The performance of batteries can change depending on the temperature around them. Understand the installation requirements for your battery so you can put it in the right location:

    • Batteries need a location or enclosure that has adequate insulation and plenty of ventilation. In Australia, a battery enclosure should ideally be located on the south or east-facing side of a building.
    • Do not install batteries in living areas of a property. Outside is safest, but some batteries can be installed in areas like sheds, garages, cellars or laundries.
    • Protect the battery and its enclosure from vermin, pets and children. Never store anything on top of or against the battery or its enclosure, as it may cause an electrical fire.

    Connecting your solar PV system to the electricity grid

    Your solar installer will usually organise permission to connect your solar PV system to the electricity grid and a new import/export electricity meter, on your behalf.

    For permission to connect to the grid, your installer needs to complete the small embedded generation application form on the SA Power Networks website.

    SA Power Networks has limits on the size of inverter energy systems connecting to their distribution network - eg from a solar PV or battery system, to protect the electricity grid and make sure it operates safely and reliably.

    For a single-phase connection, the maximum size an inverter can be is 5 kilovolt-amps (kVA). In some cases more generation may be permitted if exporting to the grid is limited - contact SA Power Networks for more information. For a three-phase connection, the maximum size the inverter can be is 30 kVA, which must be balanced across the phases. SA Power Networks' Service and installation rules manual explains the requirements for connecting an electrical installation to the distribution network.

    You'll also need an import/export meter. If you don't have one, your installer needs to speak to your chosen energy retailer to get one installed. Your new import/export meter will be a smart meter. For a list of retailers operating in South Australia and to get the best electricity deal for your needs, visit the Australian Government’s Energy Made Easy comparison website.

    For more information about connecting solar PV systems to the grid, contact SA Power Networks on 1300 665 913 or seg@sapowernetworks.com.au and see the SA Power Networks guide to installing a solar PV system.

    Solar PV system subsidies and feed-in payments

    Subsidies

    When you purchase an eligible solar PV system, the cost of the system is subsidised by the Australian government through small-scale technology certificates (STCs), as part of the Small-scale Renewable Energy Scheme.

    Each STC represents the amount of electricity the solar PV system generates over its lifetime to offset what your property would otherwise draw from the main electricity grid. The more electricity your solar PV system is capable of producing, the more STCs you will get.

    Trading your STCs offsets the cost of your solar PV system. The most common way of claiming STCs is to assign them to your installer or retailer, who will give you a point-of-sale discount on your system in return. It's a bit like a rebate, except you get an immediate discount instead of paying a larger amount and then needing to claim money back.

    Feed-in payments

    Your electricity retailer may offer you a feed-in tariff for any excess electricity your system generates and exports to the electricity grid. See solar feed-in payments or contact your energy retailer for more information.

    If you already have a solar PV system and want to install a battery, speak to your retailer about how adding a battery may affect any feed-in tariff you receive.

    Solving problems and making a consumer complaint

    Your solar PV system, battery and most installations are covered by automatic consumer guarantees. The system should operate and perform as described. A warranty offered by the supplier is separate and doesn't replace the standard consumer guarantee.

    Make a consumer complaint

    Safety checks after installing a solar PV system or battery

    How to check your solar PV system installation video

    What to look for

    Secure cables

    Ensure that all of the system's cables are secured and properly enclosed to protect them from mechanical and environmental damage. Unprotected cables (for example, laying loosely across your roof) could easily become damaged and present a safety risk.

    Example of cables that are not secured or protected

    Example of cables that are not secured or protected

    Solar array with correctly secured and protected cables

    Signs relating to safety, isolating switches and shutdown procedures

    Your system should have labels which clearly identify switches (isolators) controlling the:

    • supply from the solar panels (DC supply)
    • supply from the inverter unit (AC supply)
    • supply from the batteries (DC supply)
    • normal electricity supply main switch.

    The solar PV system or battery should also have:

    • clear shut down instructions you can follow if you need to switch off the supply from the solar panels or batteries
    • a label on your main switchboard and meter box identifying that your home has multiple energy supplies
    • a sign explaining the type of battery installed.

    If there is no shutdown procedure displayed, or you do not understand the instructions, do not operate any of the switches until your installer has explained their use to you.

    Ask your installer to show you the location of all the relevant switches and labels.

    Solar system with clearly labelled switches and shutdown procedures

    Switchboard with dual supply and solar array clearly labelled

    A certificate of compliance

    Solar PV systems and batteries must be installed by a licensed electrician, who should give you an electronic certificate of compliance (eCoC) within 30 days of the system being connected.

    If you do not receive an eCoC, it could jeopardise your insurance if an electrical-related incident subsequently causes fire or damage to the property. See using licensed tradespeople for more information.

    System maintenance

    To keep your system safe, make sure your installer provides you with a maintenance schedule. This will help ensure:

    • your system is operating correctly
    • you understand your system's performance potential and limitations
    • you understand how to interpret critical system health information, so you can recognise when the system needs attention
    • people at your property or working on the electricity distribution network are kept safe.

    Your installer or a licensed electrician should service your battery storage system every 12 months.

    If the electricity consumption at your property changes significantly without an obvious reason (for example, using a new appliance or additional people living in the home), check with your installer that the system is working properly.


      Related information

        On this site

        Grid-connected photovoltaic (PV) arrays - new, alterations, additions and repairs - technical information for licensed electricians

        Other websites

        Battery energy storage system installation safety - Queensland Government

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        Page last updated 30 September 2019

        Provided by:
        Department for Energy and Mining
        URL:
        https://www.sa.gov.au/topics/energy-and-environment/energy-efficient-home-design/solar-photovoltaic-systems
        Last Updated:
        30/09/19
        Printed on:
        10/08/20
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