i am your guide to solar finance for business

Energy savings and resource efficiency


Find out how much you can save

Solar calculators are good tools for investigating options and building your business case. There are free online solar calculators to help you work out:

  • the potential energy generation for your site
  • system size
  • bill savings
  • return on investment.

Solar calculators

Calculators are useful but are not substitutes for detailed solar system design and professional financial advice. Your accountant or financial advisor is the best person to advise you on the solar finance options that suit you.


Alternative Technology Association (ATA)

Simulates half hourly solar production and consumption for up to 35 years. It allows you to compare scenarios with different system sizes or orientations or different tariffs. It estimates economic returns for both investors and the site customer.


Solar Payback Calculator


Compares the payback period between two solar systems. It can be used to compare panel quality, orientation, tilt and battery storage options.


Solar Power System Payback &ROI Calculator

Solar Choice

Allows you to quickly test simple assumptions and system sizes to find the best size for your circumstances.


Solar Power Calculator V2.0


A simple cash flow analysis of solar system options, including finance options for a mortgage or a loan.


Energy Savings Calculator


An energy savings calculator for evaluating finance options and bill savings.


Online Solar Calculator

Green and Gold Solar

A very simple tool that calculates solar production and bill savings.


Solar Savings and ROI Calculator

LG Energy

A simple tool that compares different sizes and works out payback on a chosen option.


Solar Power Savings Calculator


Calculates and compares annual energy savings and bill savings across a number of system sizes up to 5kW.


Commercial Solar Power Savings Calculator


Calculates and compares annual energy savings and bill savings across a number of system sizes up to 100kW.


Solar Savings Calculator

Solar Market

Gives a detailed analysis for small solar systems.


Small generation unit STC calculator

Clean Energy Regulator

A calculator that determines the approximate number of small-scale technology certificates (STCs) for a solar system.


Solar Power Calculator

Solar Calculator

Calculates energy savings for a solar system up to 10kW in size over a 25 year period. It also provides modelling for a 7kWh or 10kWh battery system.


Solar Battery Calculator

Solar Calculator

Calculates savings for households with existing solar systems up to 10kW in size who are looking to install battery storage with up to 10kWh of capacity.


Off- Grid Solar Calculator

Solar Calculator

This calculator models the size of the battery and solar system needed to go ‘off-grid’. It also uses a number of variables including the days of storage the battery system would hold, its depth of discharge and any alternative or back-up generation.


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Page last updated: 07 July 2016