Solar Panel Cost Calculator
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How Much Do Solar Panels Cost?
Solar panel costs have dropped dramatically over the past decade, making residential solar one of the best home investments available. This guide breaks down every cost component and shows the return on investment over the full 25-year panel lifetime.
Cost by System Size
| System Size | Panels (400W) | Typical Cost (EUR) | Annual Generation* | Annual Savings* |
|---|---|---|---|---|
| 2 kWp | 5 | 3,200-4,200 | 1,750 kWh | 525 |
| 3 kWp | 8 | 4,400-5,800 | 2,630 kWh | 789 |
| 4 kWp | 10 | 5,600-7,200 | 3,500 kWh | 1,050 |
| 5 kWp | 13 | 6,800-8,800 | 4,380 kWh | 1,314 |
| 8 kWp | 20 | 10,400-13,500 | 7,000 kWh | 2,100 |
| 10 kWp | 25 | 12,800-16,500 | 8,760 kWh | 2,628 |
*Based on central European conditions (3.5 peak sun hours), EUR 0.30/kWh electricity price.
25-Year ROI Analysis
| System Size | Install Cost | Total Savings (25yr) | Net Profit | ROI |
|---|---|---|---|---|
| 3 kWp | EUR 5,100 | EUR 19,725 | EUR 14,625 | 287% |
| 5 kWp | EUR 7,800 | EUR 32,850 | EUR 25,050 | 321% |
| 8 kWp | EUR 11,950 | EUR 52,500 | EUR 40,550 | 339% |
| 10 kWp | EUR 14,650 | EUR 65,700 | EUR 51,050 | 348% |
These figures assume 0.5% annual panel degradation, 2% annual electricity price increase, and one inverter replacement at year 12 (EUR 600-1,200). Actual returns vary based on self-consumption rate and local electricity tariffs.
Installation Cost Breakdown
The total installation cost divides roughly as follows:
| Component | Share | Typical Cost |
|---|---|---|
| Solar panels | 40-45% | EUR 200-350 per panel |
| Inverter (string or micro) | 10-15% | EUR 600-1,500 |
| Mounting rails and hardware | 8-12% | EUR 150-250 per kWp |
| Electrical work and meter | 5-8% | EUR 300-600 |
| Scaffolding | 3-5% | EUR 300-600 |
| Installation labour | 20-25% | EUR 300-500 per kWp |
The panels themselves are no longer the most expensive component. Labour and balance-of-system costs now make up over half the total. Getting multiple quotes from solar installers is the most effective way to reduce costs without compromising quality.
Cost Savings Tips
The largest cost saving comes from right-sizing the system. An oversized system generates excess energy that earns low export rates. Use our solar panel calculator to size the system to your actual consumption. Consider improving your home's insulation first, which reduces energy needs and allows a smaller solar system.
Group buying schemes, where neighbours install together, can reduce per-home costs by 15-20% through bulk purchasing and shared scaffolding. Many local authorities and community energy groups organise these schemes annually.
These calculations are estimates only. Actual requirements may vary depending on surface conditions, product specifications, and installation methods. Always consult a qualified professional for precise measurements.
Prices updated: 2026-03Frequently Asked Questions
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