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Answer a few questions about your supply and system size to see whether single or three-phase is the right fit — and why it matters for solar.
Likely supply
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Select what you can see above to get a result.
You can usually tell your supply type from two visible clues at the switchboard — without touching anything:
Why it matters for solar: three-phase supply allows larger inverters and more balanced export, while single-phase sites face stricter inverter-size and export limits in many networks. If you can't tell, send your installer a photo — never open the switchboard yourself.
Estimates only — for guidance, not a quote or engineering specification. Nothing you enter is stored or sent anywhere; the maths runs entirely in your browser.
Sizing Tool
Turn your daily energy use, sun hours and system losses into a recommended array size, panel count and inverter rating.
Financial Tool
Estimate annual savings and payback period from system cost, generation, self-consumption, electricity rate and feed-in tariff.
Engineering Tool
From rated power and module dimensions, compute power density in W/m², module efficiency and panels needed per kilowatt.