100UP uses a straightforward sizing rule: 5 kWh for the house, plus 5 kWh per person based on bedroom capacity — the 100UP Way.
That ties system size to occupancy and winter performance, not annual averages or nameplate ratings alone. Examples:
We then model worst-case winter for your location — June/July cloud, short daylight — not best-case summer production.
Winter sizing is the engineering call that decides whether the system works through a Ballarat July or merely looks good on paper.