Enersun
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Will solar pay off for me?
Solar ROI Calculator
Estimate your payback & 20-year savings
Payback
20-yr net gain
€
System size
Sized to cover ~80% of annual usage
Capped at 10.8 kWp (single-phase grid limit)
Based on kWh/kWp/yr for your region · €0.20/kWh retail · €0.08/kWh net billing export · €1,300/kWp installed · 70% self-consumption. Indicative only — contact the installer for a precise quote.
How is this calculated?
Annual consumption = Monthly bill × 12 ÷ Tariff
System size = Annual consumption × 80% ÷ Local solar yield (kWh/kWp/yr) — capped at 10.8 kWp (Greek single-phase grid limit)
Self-consumed = the portion used on-site during generation hours — capped at the self-consumption % of household demand (default 70%, editable in Assumptions below).
Annual savings = (Self-consumed kWh × Tariff) + (Exported kWh × Export rate)
Payback period = System cost ÷ Annual savings
20-year net gain accounts for panel performance degradation (default 0.5%/yr, editable in Assumptions).
Assumptions used — edit to refine
Live: €/kWh · ,
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