Solar for homes · Spain
3 kW solar panels in Spain: installed price 2026
An installed 3 kWp solar system costs €4,300–5,200 in 2026, VAT included (€1.57 per watt): 7 panels of 440 W, a 3 kW inverter and about 20 m² of roof. In Madrid it produces about 4,970 kWh a year and pays back in about 12 years for a home using 4,000 kWh a year, before grants.
SolarPlan price index · data as of 28 September 2026
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Configuration
- Price, turnkey
- €4,300–5,200VAT included, before subsidies
- Production
- 4,970 kWh a yearNear Madrid, south-facing at 34°
- Payback
- 12 yearsAt 4,000 kWh of use a year
- Roof needed
- 20 m²7 panels of 440 W
Configuration
A typical installation of this size. Companies adapt it to your roof and your connection.
- System size
- 3 kWp
- Solar panels
- 7 × 440 W
- Panel area / roof
- 14 m² of panels, about 20 m² of roof
- Mounting
- Pitched roof, panels flush with the roof
- Inverter
- On-grid, 3 kW, single-phase
- Battery
- None — a hybrid inverter lets you add one later
- Production
- About 4,970 kWh a year
Price ranges, 2026
Turnkey: panels, inverter, mounting, cabling, installation and the grid paperwork. Low and high ends follow brands and roof difficulty.
| Configuration | Price (VAT included) | Per watt |
|---|---|---|
| 3 kW, no battery | €4,300–5,200 | €1.57 |
| 3 kW + 5 kWh battery | €7,500–9,000 | €2.72 |
SolarPlan model prices from the market data of 28 September 2026, not a quote. Real offers depend on the roof, the brands and the company. Method and downloads: the SolarPlan price index
Savings and payback
For a household using 4,000 kWh a year, the system saves about €440 in the first year and pays back in about 12 years. About 36% of the production is used on site; the rest goes to the grid at the surplus price.
No subsidies, no price increases beyond the market module's escalation; the plan for your roof uses your own bill.
Production by place
Yearly production of 3 kW, south-facing at the best fixed tilt, from SolarPlan's solar model (multi-year satellite averages).
| Place | Per kW a year | 3 kW a year |
|---|---|---|
| Valencia | 1,629 kWh | 4,890 kWh |
| Alicante | 1,608 kWh | 4,820 kWh |
| Castellón | 1,636 kWh | 4,910 kWh |
| Seville | 1,712 kWh | 5,140 kWh |
| Málaga | 1,705 kWh | 5,120 kWh |
| Barcelona | 1,557 kWh | 4,670 kWh |
| Community of Madrid | 1,657 kWh | 4,970 kWh |
| Region of Murcia | 1,657 kWh | 4,970 kWh |
Financing that fits
- IRPF deduction: 40% of the cost, up to €3,000, for works that cut the home's non-renewable energy use by 30% (energy certificates before and after; works finished in 2026). Some regions add their own deduction.
- Many town halls cut the IBI (property tax) by up to 50% for several years and the ICIO (works tax) — see your province.
Companies in Spain
639 installation companies work here
- ️ ARF Solar· Granada
- +3Sol Energía Solar· Los Palacios y Villafranca
- 1KOMMA5° España· Cerdanyola del Vallès
- 30Surenergy· Paiporta
- A2 Electricidad· Oviedo
- a2 Renovables· Talavera de la Reina
- A3 Energia· Úbeda
- Abad Energía· Quintanar de la Orden
Names from public sources (company websites and directories), so you can see who works in your area. They become SolarPlan partners only after we check them. How we verify companies
Send your plan to up to 3 of themQuestions
How much does a 3 kW solar plant cost in 2026?
3 kW, no battery: €4,300–5,200; 3 kW + 5 kWh battery: €7,500–9,000. VAT included, turnkey, before subsidies (SolarPlan price index, data as of 28 September 2026).
How many panels does a 3 kW system need, and how much roof?
About 7 panels of 440 W (14 m² of panels) — roughly 20 m² of house roof.
How much electricity does a 3 kW system produce a year?
About 4,970 kWh near Madrid. By place: from 4,670 kWh in Barcelona to 5,140 kWh in Seville.
How long does a 3 kW system take to pay back?
About 12 years for a household using 4,000 kWh a year, without subsidies; first-year savings about €440.
Does an on-grid 3 kW system work during a power cut?
No. An on-grid inverter switches off when the grid goes down, so neighbours' lines stay safe for repair crews. For power during outages choose the hybrid version: 3 kW + 5 kWh battery.
What grants are there for a 3 kWp system?
The national IRPF deduction (40%, up to €3,000) for works that improve the home's energy rating, regional deductions in some communities and IBI / ICIO bonuses in many towns. Your plan lists the ones at your address.
Single-phase or three-phase?
A 3 kW system normally uses a single-phase inverter. The company checks your connection (and the permitted power) before quoting.
Neighbouring configurations
Guides
Key figures
Updated 28 September 2026
- Home solar system without a battery: 3 kW €4,300–5,200; 4 kW €5,100–6,100; 5 kW €5,900–7,100; 6 kW €6,700–8,000 (installed, VAT included).
- With a battery: 5 kWp + 10 kWh €11,600–13,900 (VAT included).
- Price per installed watt: €1.21–1.57 (mid of the range, by size).
- Sun yield: 1,557–1,712 kWh per kWp a year (Barcelona – Seville).
- Payback of a 5 kWp system at 6,600 kWh a year: about 9 years, without subsidies.
- Electricity price used (PVPC average): €0.18 per kWh.
- National IRPF deduction: 40% of the cost, up to €3,000 (works finished in 2026, with energy certificates).
The same figures on every SolarPlan page, in the Markdown versions, in llms.txt and in the MCP tools. How the price index works