Master-craftsman business · Roofing + electrics · Kassel, Germany, and surrounding area

Your roof. Your sun. Calculated in two minutes.

Place solar panels on your roof, move the sun through the year and see straight away what the system delivers — with an open calculation instead of sales promises.

Start the configurator How we calculate

Roofing and electrics from one team
Fixed-price quote after an on-site survey
Grid-operator application included

Solar roof configurator

All figures are guide values for North Hesse — no guarantee, not a quote. You only get a binding quote after an on-site survey.

System–

Annual yield–kWh / year

Savings–per year

Payback–years

Roof plan

Top view of the panel area. Click or drag to place panels; on a keyboard use the arrow keys and the space bar.

1 · Roof shape

Gable roof Mono-pitch roof Flat roof

2 · Size & orientation

House width (ridge length)

House depth

Roof pitch

Direction the panels face

3 · Solar panels

Number of panels

Panel output

4 · Sun position

Time of day

Time of year (month)

5 · Assumptions (editable)

Electricity price (€/kWh)

Feed-in tariff (€/kWh)

Investment (€ per kWp, turnkey)

Self-consumption share

Without a battery, typical households are at 25–40%; with a battery or heat pump, 50–70%.

Your result — with the full calculation

Investment–

Savings + feed-in income / year–

Balance after 20 years (no price increases)–

Guide value, no guarantee, not a quote. Weather, shading, panel ageing, electricity price trends and subsidies are not included. We prepare a binding quote after an on-site survey and roof inspection.

How we calculate — no black box

OutputkWp = number of panels × output per panel (Wp) ÷ 1000
Annual yieldkWh = kWp × 950 kWh/kWp × factor (orientation, pitch). 950 kWh per kWp is a guide value for North Hesse with a south-facing roof at 30° pitch.
Savings€ = yield × self-consumption × electricity price + yield × (1 − self-consumption) × feed-in tariff
PaybackYears = investment ÷ savings per year (static; investment = kWp × €/kWp)

Factor by orientation and pitch (guide values)

Yield relative to the optimum in per cent, by deviation from south and roof pitch
Deviation from south	0°	15°	30°	45°	60°
South (0°)	87%	96%	100%	97%	90%
45°	87%	95%	96%	93%	86%
East / West (90°)	87%	88%	85%	78%	70%
135°	87%	81%	67%	58%	48%
North (180°)	87%	74%	58%	44%	35%

Intermediate values are interpolated linearly. This table is a simplified approximation for Germany and is no substitute for a simulation (PVGIS or similar) at the actual site.

Send your configuration as an enquiry

We'll get back to you with a date for the on-site survey. Your configuration is attached automatically.

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