Case Study

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Solar Calculator

Professional Work

A full-stack web tool used to help users estimate potential energy savings, system costs and payback periods for installing solar panels.

WordPressPHPJavaScriptGravity Forms
Solar Calculator screenshot
Solar Calculator - Main Interface

The Challenge

Many homeowners and businesses are interested in switching to solar energy but struggle to determine whether it's financially viable. The client needed a tool that could provide accurate estimates of potential savings, system costs, and return on investment, helping users make informed decisions.

Research & Approach

I lead the project and developed an effective online tool by:

  • Researching solar generation formulae, energy prices, local tariffs, and government incentives.
  • Defining key inputs and calculations such as location, energy consumption, roof size, and solar panel efficiency.
  • Co-designing an intuitive user experience to simplify complex calculations.
  • Ensuring seamless WordPress integration with pre-existing tech stack (Gravity Forms, API-based calculations, and PDF reports).
API response
API response

The Solution

I developed a custom-built calculator tool that:

  • Designed an API that returns backend calculations based on user inputs.
  • Defined necessary inputs from users for accurate data processing.
  • Researched solar exposure data and applied electricity provider-specific data to calculations.
  • Provides an instant breakdown of potential savings, system cost, and payback period.
  • Generates a personalised PDF report summarising results for user reference.

Results and Impact

  • Increased lead conversions: Users gain instant insights, making them more likely to proceed with solar installation.
  • Time-saving for sales teams: Automating calculations reduces the need for manual estimates.
  • Higher engagement: Interactive tools improve website retention and user experience.
  • Sustainability awareness: Educates users on financial and environmental benefits, driving more interest in renewable energy.
PDF report example
PDF report example

Key Highlights

Timeline

3 months

Role

Lead Developer

Team Size

4 people

Outcomes

Leads Generated

From 15 to 150+ enquiries per month

SEO Performance

Rank 1 for targeted keywords