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This is an illustrative scenario based on typical Perth household data, not a specific customer story.
Retirees often have a different usage pattern from working families. More energy is used during the day, while solar is producing, which means a smaller battery is usually enough. The battery's main job is covering the evening gap between solar production ending and bedtime.
Daytime advantage: Because retirees are home during the day, more appliances run during solar hours. This naturally increases self-consumption without needing a large battery. Running the dishwasher, washing machine, and vacuum during 10 am-2 pm maximises direct solar use.
Right-sized battery: An 8 kWh battery matches the typical evening load of 6-8 kWh (from 5 pm to 10 pm). Oversizing to 13 kWh would add $3,000-4,000 to the cost with diminishing returns, since the smaller daytime gap means less surplus to store.
Budget consideration: The net cost for an 8 kWh AC-coupled battery depends on the installed quote, current WA rebate, current federal STC factor, certificate price, and battery eligibility. Actual payback depends on system size, battery size, tariff, export profile, install price, and household load shape. Use the calculator result with the shown inputs rather than relying on a fixed payback figure.
Winter: Shorter solar days mean the battery may not fully charge. A forced-charge window on off-peak rates (if available) can top up the battery cheaply on cloudy days.
A step-by-step method covering evening usage and seasonal AC demand.
AS/NZS 5139 clearance rules, garage vs outdoor walls, and what installers check on-site.
Synergy customers get $130/kWh back, capped at $1,300.
Answer a few questions and see systems and installers that fit your home.