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Fast, transparent calculators that work entirely in your browser. Every formula is shown, nothing is stored, and no email is required.
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.
Decision Tool
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.
Sizing Tool
Size a home battery from your overnight energy use, days of autonomy, depth of discharge and round-trip efficiency.
Rebate Tool
Estimate the federal STC incentive on an Australian solar install from system size, your zone rating, deeming years and the STC price.
Engineering Tool
Work out voltage drop on a DC string or single-phase AC run from length, current, conductor size and material — checked against AS/NZS guidance.
Design Tool
Get an indicative annual-yield figure for a roof from its direction and pitch, relative to an optimally-oriented array.
Engineering Tool
Work out how many panels can go in series on a string — within the inverter's MPPT window and under the maximum system voltage — using temperature-corrected module voltages.
Design Tool
Check the ratio of array DC capacity to inverter AC rating — the inverter load ratio — and see whether it sits in the typical range or risks clipping.