How much energy do solar panels produce in Viana do Castelo?

A 5 kWp solar panel system in Viana do Castelo, Portugal produces approximately 7,419 kWh per year, based on EU PVGIS data.

How much can you save with solar panels in Viana do Castelo?

A 5 kWp system without battery saves approximately €659 per year (accounting for 18% self-consumption and feed-in tariff for surplus). The payback period is 8.3 years.

What is the optimal panel angle in Viana do Castelo?

The optimal tilt angle for solar panels in Viana do Castelo is 36 degrees facing 4 degrees from south.

Solar Panels in Viana do Castelo

Portugal · 41.69°N, 8.83°W

Solar Potential

Very Good

1,484 kWh per kWp installed capacity

Your Solar Savings Estimate

Configure system size and battery to see realistic savings

Data last updated: March 2026

System Size

Battery Storage

Annual Output

7,419kWh

Net Annual Savings

€659

Payback Period

8.3 yrs

25-Year Net

€14,816

Savings Breakdown

Self-consumed (18% of 7,419 kWh)1,335 kWh × 0.220 €/kWh

→ Savings from own usage+€294

Injected to grid (82% of production)6,084 kWh × 0.060 €/kWh

→ Feed-in revenue+€365

Net Annual Savings€659

Installation cost (5 kWp × 1,100 €/kWp)€5,500

Portugal Solar Policy

UPAC system: surplus at 90% of MIBEL market price (~€0.04-0.08/kWh). 23% VAT (6% temporary rate expired July 2025).

Source: ERSE, Eurostat H1 2025

The savings estimates shown are for informational purposes only and do not constitute financial advice. Actual savings depend on your specific installation, roof condition, shading, consumption patterns, and future electricity price changes. Feed-in tariffs and regulations change frequently. Always obtain quotes from certified installers and consult a financial advisor before making investment decisions.

Monthly Energy Production

425 kWh

501 kWh

617 kWh

685 kWh

760 kWh

747 kWh

814 kWh

795 kWh

707 kWh

548 kWh

425 kWh

396 kWh

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Month	Energy (kWh)	Irradiation (kWh/m²)
January	425	102
February	501	122
March	617	153
April	685	174
May	760	195
June	747	193
July	814	211
August	795	208
September	707	183
October	548	138
November	425	104
December	396	95
Total	7,419	1,877

Environmental Impact

CO2 Saved Per Year

1,729 kg

Equivalent Trees Planted

79 trees

Optimal Panel Angle

36° tilt

Technical Details

Data Source: EU PVGIS v5.3
Coordinates: 41.69323°N, 8.83287°W
System Loss: 14%
Optimal Inclination: 36°
Optimal Azimuth: 4°
Yearly Irradiation: 1877 kWh/m2
Retail Electricity Price: 0.220 EUR/kWh
Feed-in Tariff: 0.060 EUR/kWh
Install Cost: 1,100 EUR/kWp

€1,655

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