Solar Panels for an Apartment Building: Capacity Estimate

The calculator estimates capacity from area. Yield and seasonality are shown only if you enter an insolation value from a named source.

This is an indicative estimate, not a power supply design. Elevators, pumps and motors need an engineering calculation. Installation and connection must be done by qualified specialists only. The platform does not accept funds.

Area excluding shaded and unsuitable sections. Allowed range: from 1 to 1,000,000 m².

Needed to match the insolation data.

The compass direction the panels face.

From 0 to 90 degrees. Allowed range: from 0 to 90 °.

From 0 to 100. Allowed range: from 0 to 100 %.

Cables, inverter, soiling; from 0 to 90. Allowed range: from 0 to 90 %.

Only from the source you name below. If empty, yield is not calculated. Allowed range: from 1 to 3,000 kWh/kW.

For example, the name of the database and the date of access. At least 5 characters.

Your result

Fill in the form and press 'Calculate'.

Calculation example

Fictional input data for illustration. This is not a real building and not a recommendation.

Input data: Usable area for panels: 200 m²; Locality or region: Example; Orientation: South; Tilt angle: 30 °; Shading: 10 %; System losses: 20 %.

Result
IndicatorValue
Indicative SPP peak power30,77 kW
An engineering calculation is required: the result is incomplete or depends on unconfirmed data.

The result is indicative and is not a power supply design or a promise of backup duration.

In winter and in overcast weather, SPP yield is much lower, and during outages it may be absent; batteries should not be sized on the assumption that generation will cover the load.

SPP operation during a grid outage is not guaranteed: a grid-tied inverter without confirmed hybrid/islanding capability shuts down together with the grid. Payback is not calculated: there are no confirmed prices and tariffs.

Yield and payback are not calculated without insolation data from a named source.

Missing data:

  • Insolation data from a confirmed source
  • Off-grid capability (hybrid/islanding) is not confirmed.

Calculation module version: 1.0.0.

How it is calculated

  • Peak power = area / area per 1 kW peak.
  • Annual generation = power × annual yield per 1 kW peak × (1 − shading) × (1 − losses), within an uncertainty range.

Assumptions (unconfirmed, replace with equipment data)

  • An area of 6.5 m² per 1 kW peak is an unconfirmed assumption.
  • Insolation data is not built into the calculator; the user enters it from a named source.

Limitations

  • Payback is not calculated.
  • A grid-tied SPP without a hybrid inverter does not work during a grid outage unless off-grid operation is confirmed.
  • In winter and during an outage, generation differs from the annual average.

Frequently asked questions

Why is there no yield figure in the example?

We do not build in insolation data without a confirmed source, so the example shows capacity only.

Will the SPP work during an outage?

Only if the system has confirmed off-grid capability (a hybrid inverter). This must be checked in the documentation.

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