Global Solar ROI / Payback Tool
Estimate the payback period and return on investment for a solar system – no currency symbols, just numbers.
✨ NOTE: This tool provides estimates for educational purposes only. Actual solar savings depend on local sunlight, system orientation, and electricity prices.
📊 Formulas:
• Net system cost = system cost – subsidy.
• Annual savings (year 1) = annual generation × electricity price.
• Each subsequent year, generation is reduced by degradation factor.
• Total lifetime savings = sum of annual savings over lifespan (including degradation).
• Payback period = net cost / first‑year savings (simple, not accounting for degradation, but includes degradation in total). For a more accurate payback, we compute cumulative savings year by year until they exceed net cost.
• Net profit = total savings – net cost.
• ROI = (net profit / net cost) × 100%.
🔒 Privacy first: All calculations happen locally in your browser. No data is sent to any server.
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| Solar-ROI -Payback-Tool |