Tool

Solar Studio

Click a roof anywhere in Europe. PVGIS — the European Commission's solar database, built on 15 years of satellite irradiance — says what a system there really produces. We add the storage, self-consumption and euro maths on top.

1 · Pick a spot

Click the map for an instant 5 kW estimate at that point. Everything below fills in automatically.

2 · Describe the system

Latitude

Longitude

System size (kWp)

Tilt (°) Auto: tilt = |latitude|. Type to override.

Facing

Household use (kWh/day)

Tariffs

Country preset

You pay (€/kWh)

Export pays (€/kWh)

Grant (% of cost) Nothing is assumed — add your national scheme.

Turnkey cost (€, optional) Blank = 1,200 €/kWp under 10 kWp, 1,000 €/kWp above.

3 · What this roof produces PVGIS v5.2

Annual yield –kWh/yr

Daily average –kWh

Specific yield –kWh/kWp

Capacity factor –%

Month by month

Monthly energy from PVGIS. Winter is not a rounding error — in central Europe December is roughly a tenth of June.

A day in the life

Modelled shape for today's date, scaled to this month's real PVGIS energy, against a typical household demand curve.

Money — in euros —

Payback –years

Saved per year –

25-year net –

Cost of your kWh –

Turnkey system cost–

Grants / incentives–

Net investment–

Self-consumed share

Net present value (25 yr, 5 %)–

🔋 Storage

Battery worth having –kWh

Smallest that still helps–

Surplus to shift per day–

Beyond this it sits idle–

80 % usable depth of discharge assumed — modelled, not a quote.

⚡ Where the energy goes (average day)

Used at home–kWh

Exported–kWh

Still imported–kWh

used at home exported to the grid

Self-consumption rate–

Self-sufficiency rate–

Tilt & facing — modelled comparison

Configuration	Relative yield	Tilt	Facing

These percentages come from our own plane-of-array model, so treat them as relative: they show which orientation wins, not how many kWh you get. The kWh number above is PVGIS's.

Saved designs

Nothing saved yet. Calculate a system, then hit “Save this design” — designs stay in this browser only.

Design	kWp	kWh/yr	Payback

Sources & honesty

PVGIS 5.2 (EU Joint Research Centre) — annual and monthly energy for the point you clicked, crystalline silicon, 14 % system losses. It is the only real yield number on this page.
This site's compute service — battery sizing, self-consumption, tilt comparison and the euro maths. Modelled, transparent, and wrong in the details of your specific roof (shading, roof pitch, inverter clipping).
Tariff presets — typical 2025 household prices including taxes and typical export payments per country. Approximate; edit them to your own contract.
Nothing here is a quote or investment advice. Educational only.

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