A home battery should be sized from real solar surplus and real evening demand
Battery capacity is only one number. Power output, usable capacity, cycle behaviour, phase arrangement, backup design, inverter compatibility, tariff and household load shape determine how the system will behave.
Energy capacity
Usable kilowatt-hours indicate how much stored energy is available, but not how quickly the battery can supply large appliances.
Power output
Continuous and peak output influence which loads can run together, particularly during backup operation or high evening demand.
Control strategy
Tariffs, export settings, solar charging, grid charging permissions and reserve levels change how the battery is used.
Battery options for existing and new Perth solar systems
A battery can be considered with a new rooftop system or assessed as a retrofit. The practical pathway depends on the existing inverter, age of the solar system, switchboard, phase arrangement, communications and approved connection configuration.
- Identify the existing inverter and solar array details.
- Review switchboard condition, main switch and available protection space.
- Confirm a compliant, accessible and suitable battery location.
- Discuss backup circuits separately from standard self-consumption.
- Check current federal and WA incentive requirements before contract.
Read the solar rebate Perth guide and request a written battery quote that states usable capacity, backup scope and incentive assumptions.
Blackout backup must be designed—it is not automatic
A standard grid-connected battery may stop supplying the home when the network is down unless the system includes the required backup equipment and configuration. Even with backup, nominated circuits, battery state of charge and inverter output limit what can run.
Essential circuits
Lighting, refrigeration, communications and selected power circuits are often prioritised ahead of large heating, cooling or cooking loads.
Single-phase and three-phase sites
The backup pathway can differ by phase arrangement. The proposal should explain what remains powered and what does not.
Solar during an outage
Some configured systems can continue using solar to support the backed-up loads and recharge the battery, while others cannot. Confirm the exact behaviour.
Battery location is part of the design
Wall construction, clearances, weather exposure, vehicle impact, ventilation, access, fire-safety requirements, cable route, noise and manufacturer limits need to be reviewed. A preferred location may not be suitable after technical assessment.
Usage review
Estimate solar surplus and evening consumption from bills or interval data.
Site review
Check existing equipment, switchboard, phase arrangement and possible locations.
Battery proposal
State exact model, usable capacity, power output, backup inclusions and rebate assumptions.
Approvals and install
Complete the required vendor, incentive, network and installation steps before handover.
Request a battery installation Perth assessment
Provide the property postcode, existing solar details and whether backup is important. The team can then identify the information needed for a suitable proposal.
Many existing solar systems can be assessed for a battery retrofit. Compatibility, inverter arrangement, switchboard condition, available space, communications and current network requirements need to be checked. Only a system designed and configured for backup will supply nominated circuits during an outage. Backup capacity, phase arrangement, surge loads and battery state of charge limit what can run. Sizing should consider solar surplus, evening and overnight usage, desired backup, tariff structure, usable capacity, power output and budget rather than selecting capacity from household size alone. WA and Australian Government programs may reduce the cost of eligible systems. Amounts and requirements change, so eligibility should be confirmed against current official guidance and the written quote.Questions about battery installation perth
Can a battery be added to existing solar?
Will a home battery run the house during a blackout?
How is a Perth home battery sized?
Are battery rebates currently available in WA?