The right solar system size depends on your household’s electricity use, roof space, budget, likely future demand and your local network’s export limits. Review your bills to estimate daily usage, then compare it with the system’s expected generation for your location and roof orientation. A larger system may suit homes with high daytime consumption, electric vehicles or a heat pump, while a battery can help use more solar after sunset. A Clean Energy Council-accredited installer can assess your property and confirm the suitable size and connection requirements.