Solar & Battery Calculator

Work out the real numbers — payback, savings, profit & ROI for your solar and battery setup.

📐 System Sizing

Work out how many panels fit on your roof

Flat 0°Optimal 35°Steep 60°
23 panels fit
9.2 kWp system
8,280 kWh/year est.

⚡ Your System

Enter your panel and battery details

🏠 Energy Profile

Your electricity consumption and usage patterns

Self-Consumption Estimator

Estimate what % of your solar you'll use directly. or enter manually below.

💷 Tariffs

Your electricity rates

📊 Results

Your solar & battery financials

Payback Period
Total Profit
ROI
Year 1 Savings
Year 1 Export Income
Cost per kWh
CO₂ Offset

Cumulative Cash Flow

Annual Savings Breakdown

Energy Flow

📈 Solar vs Investment

What if you invested the money instead?

🔄 Scenario Comparison

Save and compare up to 3 scenarios

💾 Export & Import

Download your results or restore a previous session