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Free solar calculators and tools

21 free tools to size, price and plan a solar system. They run in your browser, so there is nothing to install.

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Who benefits from our solar tools

Homeowners

Work out what size system you need and what it should cost, before you talk to a salesperson.

  • Size panels, battery and inverter for your home
  • See cost, savings and payback in plain numbers
  • Check a quote against realistic prices

Installers and contractors

Do the design maths in minutes and send a clean quote.

  • String size, wire size and voltage drop
  • Tilt angle and row spacing
  • Quotes and parts lists as a PDF, plus job profit

Solar business owners

Keep small-company paperwork in one place.

  • Track leads and stock
  • Maintenance dates and warranty end dates
  • Saved in your own browser

Popular solar tool categories

System sizingHow many panels, how big an inverter and how much battery a system needs.5 tools →Wiring and electricalHow many panels fit in a string, and the wire size for each run, checked against the standard tables.2 tools →Array layoutThe best tilt for your location, how far apart to set the rows, and how many panels fit in an area.3 tools →Cost and savingsWhat a system costs, what it saves, when it pays back, and what an install earns the installer.4 tools →Quotes and paperworkFor installers: quotes and parts lists you can print as a PDF.2 tools →Business toolsSimple lead and stock lists for small solar companies.2 tools →

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Solar guides

Solar Panel Costs: What Changes the Price

What changes the price of a solar system, and what to check in a quote.

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