Solar for homes · Spain
4 kW solar panels with a battery: installed price 2026
An installed 4 kWp solar system with a 5 kWh battery costs €8,300–9,900 in 2026, VAT included. The battery raises the share of solar used at home to about 56%; payback is about 15 years (about 10 years without the battery), before grants.
SolarPlan price index · data as of 28 September 2026
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Configuration
- Price, turnkey
- €8,300–9,900VAT included, before subsidies
- Production
- 6,630 kWh a yearNear Madrid, south-facing at 34°
- Payback
- 15 yearsAt 5,300 kWh of use a year
- Roof needed
- 25 m²10 panels of 440 W
Configuration
A typical installation of this size. Companies adapt it to your roof and your connection.
- System size
- 4 kWp
- Solar panels
- 10 × 440 W
- Panel area / roof
- 20 m² of panels, about 25 m² of roof
- Mounting
- Pitched roof, panels flush with the roof
- Inverter
- Hybrid (with backup output), 3.6 kW, single-phase
- Battery
- 5 kWh, lithium iron phosphate (LFP)
- Production
- About 6,630 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 |
|---|---|---|
| 4 kW, no battery | €5,100–6,100 | €1.39 |
| 4 kW + 5 kWh battery | €8,300–9,900 | €2.26 |
| 4 kW + 10 kWh battery | €10,800–12,900 | €2.94 |
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 5,300 kWh a year, the system saves about €770 in the first year and pays back in about 15 years. About 56% of the production is used on site; the rest goes to the grid at the surplus price.
With the 5 kWh battery the payback is about 15 years; without it, about 10 years. The battery's main value here is using more of your own solar.
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 4 kW, south-facing at the best fixed tilt, from SolarPlan's solar model (multi-year satellite averages).
| Place | Per kW a year | 4 kW a year |
|---|---|---|
| Valencia | 1,629 kWh | 6,520 kWh |
| Alicante | 1,608 kWh | 6,430 kWh |
| Castellón | 1,636 kWh | 6,540 kWh |
| Seville | 1,712 kWh | 6,850 kWh |
| Málaga | 1,705 kWh | 6,820 kWh |
| Barcelona | 1,557 kWh | 6,230 kWh |
| Community of Madrid | 1,657 kWh | 6,630 kWh |
| Region of Murcia | 1,657 kWh | 6,630 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 4 kW solar plant cost in 2026?
4 kW, no battery: €5,100–6,100; 4 kW + 5 kWh battery: €8,300–9,900; 4 kW + 10 kWh battery: €10,800–12,900. VAT included, turnkey, before subsidies (SolarPlan price index, data as of 28 September 2026).
How many panels does a 4 kW system need, and how much roof?
About 10 panels of 440 W (20 m² of panels) — roughly 25 m² of house roof.
How much electricity does a 4 kW system produce a year?
About 6,630 kWh near Madrid. By place: from 6,230 kWh in Barcelona to 6,850 kWh in Seville.
How long does a 4 kW system take to pay back?
About 15 years for a household using 5,300 kWh a year, without subsidies; first-year savings about €770.
What grants are there for a 4 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.
Is a battery worth it for 4 kWp?
In money terms rarely: payback is about 15 years with the battery and about 10 years without. It is worth it if you want backup in power cuts or use most of your electricity at night.
Single-phase or three-phase?
A 4 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