A Perth Homeowner’s Guide to Solar Panels and Battery Storage in 2026
Residential solar and battery systems can help Perth homeowners reduce the amount of electricity they purchase from the grid, use more renewable energy within the home and prepare for future electrical needs such as EV charging, electric hot water and additional air conditioning.
A solar system generates electricity during daylight hours. The home uses that electricity first, while any remaining generation may be exported to the grid or stored in a compatible battery. The battery can then supply electricity later, commonly during the evening, overnight or when solar production is lower.
However, installing solar and battery storage involves more than selecting a package based on its advertised capacity. The most suitable system depends on the household’s electricity consumption, roof layout, shading, tariffs, switchboard, network connection and plans for future electrical equipment.
Battery incentives have also made storage more accessible to eligible Australian households, but a battery is not automatically the right financial choice for every property. Understanding how the equipment works and how your household actually uses electricity is essential before committing to an installation. Contact RSEG today and our electricians are more than happy to explain everything to do with your potential solar system.
How Does a Residential Solar System Work?
Solar panels contain photovoltaic cells that produce direct current electricity when exposed to sunlight. An inverter converts that electricity into alternating current suitable for household appliances and the electricity network.
The home generally uses available solar generation before purchasing electricity from the retailer. If the panels generate more electricity than the property is consuming, the surplus can be exported to the grid, stored in a battery or directed to compatible equipment such as an EV charger or controlled hot water system.
The Australian Government advises that the appropriate solar system size depends on available sunny roof space, how much electricity the property uses and when it is used, local sunshine, electricity tariffs, feed in rates and the homeowner’s budget.
A residential solar system commonly includes:
Solar panels
Roof mounting equipment
A string, hybrid or microinverter system
DC and AC cabling
Electrical protection and isolating equipment
A monitoring application
Metering and network connection equipment
Optional battery storage
Optional consumption monitoring
The exact design should be based on the individual property rather than a standard package applied to every home.
How Does a Home Battery Work?
A home battery stores electricity for use later. It will commonly charge when the solar panels are producing more electricity than the home requires and discharge when household demand exceeds available solar generation.
This may reduce the amount of electricity purchased from the grid during the evening or other higher demand periods. The financial result depends on available excess solar, household consumption, electricity tariffs, feed in credits, battery capacity and how the battery is configured.
Battery systems have two important ratings:
Storage capacity
Storage capacity is measured in kilowatt hours, or kWh. It represents how much usable energy the battery can store.
For example, a battery with 10 kWh of usable storage could theoretically provide 1 kW for ten hours or 5 kW for two hours, although actual performance is affected by system losses, operating limits and the battery’s configuration.
Power output
Power output is measured in kilowatts, or kW. It determines how much electricity the battery can supply at one time.
A battery may hold enough energy to run a home for several hours but still be unable to operate numerous high demand appliances simultaneously if its power output is limited.
Both measurements should be considered. Choosing a battery only by its advertised storage capacity can result in a system that does not perform as expected.
Do You Need Solar Panels Before Installing a Battery?
The Australian Government’s Cheaper Home Batteries Program supports eligible batteries connected to a new or existing solar system. It is therefore possible to install solar and battery storage together or add a compatible battery to an existing system.
Adding a battery to existing solar may require:
A compatible hybrid inverter
A separate battery inverter
Additional metering
Updated network approval
Reconfiguration of the existing solar system
Replacement of incompatible or ageing equipment
An existing system should be assessed before a battery is selected. The original inverter, available solar surplus, panel capacity, network approval and switchboard all affect the most appropriate solution.
Benefits of Residential Solar Panels
Reduced grid electricity consumption
Electricity generated and used directly within the home replaces electricity that would otherwise be purchased from the retailer.
This is known as solar self consumption. The greatest bill savings commonly occur when household appliances operate while the panels are generating, because the retail electricity cost avoided may be higher than the credit received for exporting that electricity.
Support for future electrification
A suitably designed solar system can help offset electricity used by:
Pool equipment
Heat pump hot water systems
Induction cooking
Workshop equipment
Additional household appliances
Future requirements should be discussed during the original system design. Upgrading later may involve additional equipment, approvals and installation costs.
Monitoring and greater visibility
Modern solar monitoring platforms can display generation, fault notifications and historical performance.
Where consumption monitoring is included, homeowners may also be able to see electricity used within the property, purchased from the grid and exported. Regularly reviewing this information can help identify faults and shift suitable electricity use into solar generation hours.
Benefits of Adding Battery Storage
Using more solar energy after sunset
Without a battery, unused solar is generally exported to the grid. A battery can store some of that energy and make it available later when the panels are producing little or no electricity.
Reducing exposure to time based tariffs
Where electricity costs vary by time of day, a correctly configured battery may reduce grid consumption during higher priced periods.
The benefit depends on the tariff, charging strategy, battery efficiency and the household’s consumption pattern. Savings should be estimated using actual bills or interval data rather than generic assumptions.
Potential blackout backup
Some battery systems can provide backup power during a network outage, but this capability must be designed into the installation.
Most grid connected solar only systems shut down when the network fails. An islandable solar and battery system can disconnect safely from the grid and continue supplying nominated circuits or, where appropriately designed, a larger portion of the home.
Backup capability may be limited by:
Battery charge level
Battery power output
Inverter capacity
Number of backup circuits
Appliance starting currents
Available solar production
System configuration
A battery installation should not be assumed to power the entire home automatically during a blackout.
Is a Battery Financially Worthwhile?
A battery may be worthwhile when the home exports substantial excess solar during the day and purchases significant electricity during the evening.
It may provide less financial benefit when:
Most solar is already used during daylight hours
Evening electricity use is low
The solar system produces little excess generation
The battery is oversized
The feed in tariff is comparatively valuable
The battery is installed primarily for occasional backup
The household may move before recovering the investment
The Australian Government specifically advises that bigger is not always better. A battery that is too large for the solar system, inverter or household consumption may deliver limited additional value.
Financial payback is not the only consideration. Some homeowners place additional value on backup power, greater energy independence or supporting more renewable energy use within the property.
RSEG will outline potential cost savings in any proposal, contact us today for your free solar quote.
Federal Battery Support in 2026
The Australian Government’s Cheaper Home Batteries Program provides approximately a 30% discount on eligible small scale battery systems connected to new or existing solar.
The program began on 1 July 2025 and operates through the Small scale Renewable Energy Scheme. Program adjustments introduced from 1 May 2026 are intended to maintain a discount of approximately 30% across different eligible battery sizes while reflecting changes in battery costs.
The discount is usually applied by the retailer or installer through Small scale Technology Certificates. Eligibility and the final discount depend on factors including the battery, usable capacity, installation date and current certificate value.
Homeowners should confirm:
Whether the proposed battery is eligible
The value of the discount shown in the quote
Whether the discount is applied upfront
The battery’s usable capacity
The installer’s accreditation
Warranty conditions
Estimated financial performance
The system must satisfy the relevant program conditions, and the installer must hold the appropriate Solar Accreditation Australia accreditation.
WA Residential Battery Scheme in 2026
As at July 2026, the WA Residential Battery Scheme offers eligible households:
A rebate of up to $1,300 for Synergy customers
A rebate of up to $3,800 for Horizon Power customers
Potential access to a no interest loan of up to $10,000
The WA support can operate alongside the federal Cheaper Home Batteries Program. Eligibility requirements apply, and participation in a Virtual Power Plant is required to access the WA scheme. An approved vendor applies for the WA rebate on behalf of the customer.
Customers should verify the latest rebate amounts, eligible equipment, approved vendors, VPP terms and loan requirements before signing a contract because government programs and eligibility conditions can change.
A rebate should not be the sole reason for choosing a battery. The system still needs to be appropriately sized, compatible with the property and supported by suitable warranties and after sales service.
What Is a Virtual Power Plant?
A Virtual Power Plant, commonly called a VPP, connects participating batteries through software so their stored energy or charging behaviour can be coordinated.
Depending on the program and agreement, the VPP operator may charge or discharge part of the battery at selected times to support the electricity system. In exchange, customers may receive credits, incentives or access to a particular rebate.
Before joining a VPP, review:
How much of the battery the operator may access
Minimum reserved backup capacity
Frequency of battery cycling
Available credits or payments
Contract duration
Exit conditions
Internet connectivity requirements
Effects on battery warranties
The WA Residential Battery Scheme requires VPP participation, so the applicable agreement should be understood before the installation proceeds.
What Changed for WA Solar and Batteries in May 2026?
New connection requirements began applying to new or upgraded solar and battery systems on Western Australia’s South West Interconnected System from 1 May 2026.
The changes provide a pathway for greater system flexibility and potentially larger exports where network capacity permits. Systems participating in export products may also need compatible communications and remote connection functionality determined by the electricity retailer.
An embedded generation connection application is required when installing a new inverter system, changing or relocating an existing inverter or adding another source such as battery storage. The homeowner is responsible for the connection application, although the solar supplier may be authorised to submit it on the homeowner’s behalf.
These requirements mean that inverter compatibility, internet connectivity, commissioning and network approval should be considered before equipment is ordered.
Choosing the Right Solar System Size
The appropriate system should be based on:
Recent electricity bills
Interval consumption data where available
Daytime and evening electricity use
Available roof space
Roof orientation and pitch
Shading
Electricity tariffs
Network export limits
Future appliances
Planned battery storage
EV charging requirements
Budget
A larger solar array can help support future electrical loads and provide additional battery charging, but it still needs to comply with the inverter specifications and applicable network requirements.
RSEG or the Australian Government’s SunSPOT calculator can provide an independent estimate of suitable system size, cost, projected bill savings, potential shading and the impact of adding battery storage.
Choosing the Right Battery Size
Battery sizing should begin with the amount of excess solar available and the amount of electricity normally consumed after solar production declines.
Useful information includes:
Average daily solar exports
Evening and overnight consumption
Highest simultaneous appliance demand
Desired backup duration
Essential backup circuits
Planned EV charging
Seasonal changes in electricity use
Battery charging and discharging limits
A household that exports 4 kWh on an average day may struggle to fully charge a much larger battery from solar alone. Conversely, a small battery may fill early and leave additional solar available for export.
The proposal should distinguish between nominal capacity and usable capacity. Usable capacity is the portion of the battery that can normally be charged and discharged under the manufacturer’s operating controls.
Hybrid Inverter or AC Coupled Battery?
Hybrid inverter
A hybrid inverter can manage both solar panels and compatible battery storage.
Installing a hybrid inverter with a new solar system may simplify adding a compatible battery later, although “battery ready” does not guarantee compatibility with every future battery model.
Read more about our residential solar systems here.
AC coupled battery
An AC coupled battery includes or uses its own inverter and may be added alongside an existing solar inverter.
This can be useful when the existing solar system remains serviceable but is not directly compatible with the desired battery. The final arrangement may involve additional conversion losses, equipment and switchboard work.
The most appropriate option depends on the existing system, intended battery, backup requirements, available installation space and plans for future expansion.
Choosing Equipment and an Installer
Solar and battery equipment should be selected based on more than headline capacity or price.
Compare:
Specific panel, inverter and battery models
Product and performance warranties
Usable battery capacity
Battery output
Operating temperature requirements
Backup capability
Monitoring functions
Australian technical support
Expansion options
Manufacturer warranty conditions
Installation workmanship coverage
Australian Government guidance recommends checking the installer’s Solar Accreditation Australia credentials, obtaining multiple quotes and confirming that the quote clearly explains the equipment, warranties, network limits, monitoring and after sales support.
Battery warranties can include conditions relating to operating temperatures, charging frequency and whether grid electricity may be stored. Those conditions should be reviewed before selecting a product or installation location.
RSEG only use the highest qualify manufacturers for our solar equipment, like SolaX or Sigenergy.
Where Can a Battery Be Installed?
Battery placement is governed by product requirements and applicable installation standards.
Factors that may affect the location include:
Exposure to direct sunlight
Heat and weather
Ventilation
Proximity to doors and windows
Habitable rooms
Vehicle impact
Fire separation
Access for maintenance
Cable routes
Manufacturer clearances
A garage, external wall or dedicated equipment area may be suitable, but the final location must be assessed for the particular battery and property. A battery should not be positioned solely according to appearance or convenience.
Contact RSEG to discuss your solar system in advance.
Solar and Battery Maintenance
Modern residential systems generally require limited routine attention, but they should not be ignored after commissioning.
Homeowners should:
Review the monitoring application regularly
Investigate persistent fault notifications
Keep inverter and battery ventilation areas clear
Avoid storing objects against equipment
Maintain required equipment clearances
Check for obvious physical damage from ground level
Keep system documentation and warranty information
Arrange professional assessment when performance changes unexpectedly
Solar and battery repairs should only be performed by appropriately qualified people. Solar equipment can remain energised even when the mains supply has been switched off.
Solar panels do not necessarily require cleaning on a fixed annual schedule. The need depends on rainfall, roof pitch, dust, birds, trees and the surrounding environment. Roof access should be left to people with suitable training and safety equipment.
Monitoring Your Solar and Battery System
Monitoring helps confirm that the system is generating, charging and discharging as expected.
A suitable monitoring platform may show:
Current solar generation
Daily and historical production
Household consumption
Battery charge level
Battery charging and discharging
Grid imports
Solar exports
Fault notifications
Backup status
VPP activity
The installer should explain how to access the monitoring system, expected seasonal generation and how the battery has been configured. Checking the system regularly can help identify faults that might otherwise remain unnoticed until the next electricity bill arrives.
Planning a Residential Solar and Battery System in Perth
Before requesting a quote, gather:
Recent electricity bills
Interval data or smart meter information
Details of your current tariff
Photos of the roof and switchboard
Information about any existing solar system
Typical daytime and evening electricity use
Planned EVs or electrical appliances
Preferred backup circuits
Your budget and priorities
RSEG designs and installs residential solar panels, battery storage and associated electrical infrastructure across Perth.
Our team can assess your roof, electricity consumption, switchboard, network connection and future energy requirements before recommending an appropriate system. Current incentive eligibility and any approved vendor requirements should be confirmed as part of the quotation process.
Contact us for a free solar quote today!
Residential Solar and Battery FAQs
Will solar panels eliminate my electricity bill?
Not necessarily. Bills may still include fixed charges and electricity consumed when solar production does not meet household demand. The result depends on system size, usage, tariffs and exports. Contact RSEG to see the impact of a residential solar system on your property today.
Do I need a battery with solar panels?
No. Solar panels can operate without battery storage. A battery may be useful where the home exports substantial daytime solar and consumes significant electricity later.
Can I add a battery to an existing solar system?
Often, yes. The inverter, switchboard, network approval, existing panel capacity and desired battery must first be assessed for compatibility.
Will solar panels work during a blackout?
Most standard grid connected solar systems shut down during an outage. Continued operation requires a compatible islandable battery and backup arrangement.
Will a battery power the entire house?
Not automatically. Some systems supply only nominated essential circuits, while others can support larger loads. Performance depends on battery output, inverter capacity, stored energy and system design.
How large should my solar system be?
The right size depends on available sunny roof space, electricity consumption, tariffs, budget, network limits and future electrical requirements. RSEG electricians will assess your property and work with you to determine the right size system for your needs.
How large should my battery be?
Battery size should be based on available excess solar, evening consumption, required power output and backup expectations. Bigger is not always better.
What battery rebates are available in WA in 2026?
Eligible households may access the federal Cheaper Home Batteries Program. The WA scheme currently offers up to $1,300 for eligible Synergy customers and $3,800 for eligible Horizon Power customers, subject to requirements including VPP participation and use of an approved vendor.
Can solar charge my electric vehicle?
Yes. A compatible EV charger can use available solar generation. Smart chargers may prioritise surplus solar and manage their output according to household demand.
Will my switchboard need upgrading?
Not always. The switchboard must be assessed for its condition, available space, protection, capacity and compatibility with the proposed solar and battery installation. If your switchboard does need to be upgraded, RSEG electricians can handle the work.
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