Price by system size
The €1,000-1,500 per kWp range covers everything from budget builds with mid-tier brands to premium systems with LONGi BC + Fronius inverter. The price includes panels, inverter, mounting structure, wiring, protections, labour, and full legal certification.
| System | No battery | + 10 kWh battery | Savings/yr |
|---|---|---|---|
| 3 kWp | €3,500-4,500 | €6,000-9,000 | €400-600 |
| 5 kWp | €5,000-7,000 | €7,500-11,500 | €600-1,000 |
| 8 kWp | €8,000-10,500 | €10,500-15,000 | €950-1,400 |
| 10 kWp | €10,000-13,000 | €12,500-17,500 | €1,100-1,600 |
Pricing table for 4 residential solar system sizes: panel count, roof area required, price without battery, price with 10 kWh battery, estimated annual savings
Where does the money go? Cost breakdown
Panels are only 30-35% of the total cost. The inverter, mounting structure, wiring, and labour make up the rest. Permits and certification add another 5-8%.
| Component | % of total | Cost (5 kWp) |
|---|---|---|
| Solar panels | 30-35% | €1,650-2,350 |
| Inverter | 15-20% | €850-1,350 |
| Labour | 20-25% | €1,100-1,650 |
| Mounting structure | 8-12% | €450-800 |
| Wiring & protection | 8-10% | €450-650 |
| Permits + certificate | 5-8% | €300-500 |
Table with 6 components of a residential solar installation, percentage of total cost, range for a 5 kWp system, and specification notes
Solar battery prices in 2026
A 10 kWh battery adds roughly €2,500-4,500 to the turnkey price (€500-800/kWh installed). Batteries raise self-consumption from 30-40% (panels alone) to 70-80%.
| Brand | Chemistry | Capacity | Installed price | Warranty |
|---|---|---|---|---|
| BYD Battery-Box | LFP | 2.56-22.08 kWh | €600-800/kWh | 10 years |
| Huawei LUNA 2000 | LFP | 5-30 kWh | €700-900/kWh | 10 years |
| Pylontech | LFP | 4.8-14.4 kWh | €500-700/kWh | 10 years |
Comparison of 3 LFP battery brands: chemistry, scalable capacity, cycles, installed price per kWh, warranty
How long does it take to pay back?
Without subsidies: 6-9 years. The IRPF deduction (Spanish tax residents) shortens it modestly. Panels last 25+ years, generating net savings of €20,000-30,000.
| Scenario (5 kWp) | Investment | Savings/yr | Payback | 25-yr savings |
|---|---|---|---|---|
| No subsidies (baseline) | €6,000 | €800/yr | 6-9 years | ~€25,000 |
| With IRPF deduction (Spanish tax resident) | €5,500 effective | €800/yr | 6-8 years | ~€26,500 |
| With IRPF + IBI bonus (Torremolinos 50%) | €5,500 | €800 + IBI | 6-8 years | ~€27,500 |
| Non-resident (IRNR — no IRPF deduction) | €6,000 | €800/yr | 6-9 years | ~€25,000 |
| With 10 kWh battery, no subsidies | €9,500 | €1,100/yr | 8-10 years | ~€24,000 |
5 ROI scenarios for a 5 kWp system: net investment after deductions, annual savings, payback years, accumulated 25-year savings
Tax residency caveat — important for expats
The IRPF deduction (up to 40%) only applies to Spanish tax residents (those who file IRPF — typically people who spend >183 days/year in Spain or have their main centre of economic interests here). Non-residents pay IRNR (Non-Resident Income Tax) and cannot claim the IRPF deduction. However, IBI and ICIO municipal bonuses apply to all property owners regardless of tax residency status — they are property-based taxes, not income taxes. Always confirm your status with a Spanish tax adviser before relying on any deduction.
Financing — can I pay in instalments?
Yes — green loans from 3.74% TIN. The monthly payment is usually lower than the electricity savings.
| Entity | TIN | Max term | Monthly (€6,500) |
|---|---|---|---|
| Santander Sostenible | from 3.74% TIN | 10 years | ~€60/mo |
| BBVA Eco Consumo | from 4.95% TIN | 8 years | ~€76/mo |
| CaixaBank MicroBank | from 4.50% TIN | 8 years | ~€74/mo |
| Bankinter Eficiencia | 4.45% TIN fixed | 7 years | ~€81/mo |
| Triodos Bank (ethical) | from 4.20% TIN | 10 years | ~€61/mo |
| Installer (promo) | 0% APR | 2-3 years | ~€200-250/mo |
6 financial entities offering green loan products for solar installation: TIN, max term, estimated monthly payment for €6,500, product note