Solar calculators

Work out your numbers before you speak to an installer. Enter your location and bill once, and every calculator reuses them. Everything runs in your browser.

Plan your system

Solar Generation Calculator

See monthly output for your location, tilt, and direction.

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Solar System Size Calculator

Match system size to your energy use and roof.

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On-Grid vs Off-Grid vs Hybrid Solar Calculator

Compare generation and cost for all three system types.

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Rooftop Solar Feasibility Calculator

Check usable roof area and maximum system size.

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Costs and savings

Solar Savings Calculator

Compare your bill before and after solar.

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Solar Payback and ROI Calculator

Find your break-even year, NPV, and IRR.

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Solar Installation Cost Calculator

Get an itemised installation cost range.

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Solar Incentive Checker

See which incentives you may qualify for.

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Solar Quote Comparison Tool

Compare installer quotes side by side.

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Batteries and backup

Battery Bank Calculator

Size capacity and layout for your backup needs.

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Battery Backup Calculator

See real runtime for your appliances.

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Home energy

Electricity Bill Calculator

Break down your bill and true cost per unit.

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AC Energy Consumption Calculator

Estimate AC units and running cost.

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Engineering tools

Solar Inverter Size Calculator

Check inverter size, ratio, and clipping.

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Solar String Voltage Calculator

Check string voltage at hot and cold extremes.

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Cable Size Calculator

Estimate cable size and voltage drop.

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