Quick answer
A 15 kW residential-scale array may suit very high-load homes or properties electrifying transport and heating, subject to roof and network constraints.
What matters most
- Check whether large midday exports are realistic or constrained.
- Model battery charging demand separately.
- Use actual interval data if available.
Solar decision framework
Separate production from value. System size and location drive generation; your daytime load drives self-consumption; tariff structure determines what each kilowatt-hour is worth.
How to calculate it with SunnyWatly
Use the relevant calculator with your own bill, quote or vehicle information. Defaults are examples only and can become stale as tariffs, rebates and hardware change.
Do not rely on a headline figure alone. Ask what assumptions sit behind the estimate and whether they match your property, tariff and usage pattern.
What can change the result
- Electricity usage and time of day.
- Retail import and feed-in tariffs.
- Roof, shading, inverter or charger constraints.
- Hardware efficiency and usable capacity.
- Network limits and future tariff changes.
Primary public sources used by SunnyWatly