How many solar panels do I need for my house?

Indicative sizing guide based on PVGIS Málaga production. Real production varies by exact municipality and roof orientation. Translation may need a fact-check pass.

An average family in Málaga (3,500-5,000 kWh/year) needs between 8 and 10 panels of 500W (4-5 kWp), occupying about 30-35 m² of rooftop. In Málaga you need fewer panels than the national average thanks to higher solar production verified by PVGIS (European Commission) PVGIS 5.2 · 2026-04-08 .

Quick table — panels by your consumption

Your consumption	kWh/year	System	500W panels	Rooftop needed
Low (1 person, apt)	1,500 – 2,500	2 kWp	4 panels	~15 m²
Medium (couple)	2,500 – 3,500	3 kWp	6 panels	~20 m²
Family (3-4 people)	3,500 – 5,000	4-5 kWp	8-10 panels	30-35 m²
Large family / pool	5,000 – 7,000	5-7 kWp	10-14 panels	35-50 m²
High consumption / heavy AC	7,000 – 10,000	7-10 kWp	14-20 panels	50-70 m²

Production calculated with PVGIS for Málaga (1,656 kWh/kWp/year, optimal angle 34°). Rooftop needed is for sloped cover (~6-7 m²/kWp). On flat roof you need ~10-12 m²/kWp due to row separation.

How to know exactly — quick formula

Your electricity bill shows annual consumption in kWh. Look for “annual consumption” or sum the 12 months.

Málaga advantage: you need fewer panels

Thanks to 1,656 kWh/kWp/year production in Málaga, a family here needs fewer panels than in Madrid or northern Spain to cover the same consumption. This makes installation cheaper and reduces rooftop space needed.

City	PVGIS production	Panels for 5,000 kWh/year
Málaga	1,656 kWh/kWp	8 panels
Madrid	~1,500 kWh/kWp	9 panels
Barcelona	~1,450 kWh/kWp	10 panels
Bilbao	~1,200 kWh/kWp	12 panels

Source: PVGIS 5.2 European Commission API. Málaga benefits from privileged climate position and optimal solar angle in southern Iberian peninsula.

Production data per city comes from the PVGIS 5.2 tool from Joint Research Centre (European Commission), queried with exact city coordinates.

Annual production per kWp in Málaga

1,656 kWh/kWp

Fuente: PVGIS 5.2 · 34° angle · azimuth 2° south · 14% losses

What panel power to choose in 2026

The 2026 residential standard are 500-550W panels with N-type TOPCon or Back Contact technology. The 400W PERC panels are previous generation being phased out.

Power	Technology	Typical use	Price/panel
400-440W	PERC (old)	Stock panels, low-cost installations	~€60-70
500-550W	N-type TOPCon	2026 residential standard	€72-85
580-650W	TOPCon / Back Contact	Premium residential or commercial	€90-120

Component panel prices verified at Spanish wholesale distributors April 2026. Final installed price also includes inverter, structure, wiring and labor.

Rooftop space — do I have enough?

Each 500W panel measures approximately 2.10 × 1.13 m (~2.4 m² per panel). But you need additional space for structure and separation:

Roof type	Space required per kWp	Note
Sloped (coplanar)	6-7 m² / kWp	Panels flush with roof
Flat (with frame)	10-12 m² / kWp	Rows with anti-shadow separation

For a family with 5 kWp (10 panels) you need about 30-35 m² on sloped roof, or 50-60 m² on flat roof.

Can I install on a small roof?

Yes. Even with 3-4 panels you generate significant savings in Málaga:

Minimum system	Panels	Production	Annual savings	Cost
2 kWp	4 × 500W	~3,312 kWh	~€300-400	€2,500 – €3,500
3 kWp	6 × 500W	~4,968 kWh	~€450-550	€4,000 – €5,500

Even with limited rooftop space, small installations are profitable in Málaga thanks to high local solar production.

For a 2 kWp system (4 panels) you only need 12-15 m² of roof — fits in most single-family homes even with complex roofs or partially occupied by chimneys, windows or skylights.

Next step

To know exactly how many panels fit on your roof, how much you’d save, and which brand to use, use our solar calculator with real PVGIS data for your specific municipality (Marbella, Fuengirola, Nerja, Torrox, etc. — production varies slightly between municipalities). To understand price range by size, check the installation cost guide or if you’re interested in adding backup, the battery price analysis.

Preguntas frecuentes

How do I calculate my annual consumption?

Look at your electricity bill — usually shows 'Total annual consumption' or 'Year consumption' in the breakdown. If not, sum the consumptions of the last 12 receipts. For those new to the home, it may be more accurate to ask the retailer for history.

Is it better to cover 100% of consumption or oversize?

Neither. The optimal is to cover 120-140% of annual consumption to take advantage of surplus compensation. Exact 100% misses the opportunity to generate additional income during solar peaks.

What if my roof isn't optimal (east or west facing)?

You'll produce approximately 10-15% less than optimal south orientation, but it's still profitable in Málaga due to high irradiation. East/west is sometimes even preferred because it distributes production better throughout the day.

Do I have to fill the whole roof?

No. Install only the panels covering your consumption + reasonable margin. Overdimensioning much means selling surplus at low price, and additional payback stretches. Better to size right from the start.

Can I install on a flat roof?

Yes, but you take more space. On flat roofs panels go with inclined frame, and rows need separation to avoid mutual shading — about 10-12 m²/kWp versus 6-7 m²/kWp on sloped roofs.