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Solar capacity

Solar capacity indicates the maximum electricity output of a PV system under optimal conditions — a key parameter for system sizing, storage integration and economic planning.

Solar capacity

Solar capacity describes the installed power output of a photovoltaic system (PV system). It is measured in kilowatt peak (kWp) or megawatt peak (MWp) and indicates how much electrical power the system can generate under standard test conditions (STC).

How it works

Solar capacity is calculated as the sum of the nominal output of all installed solar modules.

It represents the theoretical maximum power of the PV system and therefore reflects the overall size and expansion level of the installation — regardless of the actual electricity production.

In general, the higher the solar capacity, the more electricity can potentially be generated. However, the actual energy yield depends on factors such as location, module orientation, shading, and weather conditions.

When combined with Battery Energy Storage Systems (BESS), solar capacity can also be used more efficiently by increasing the share of self-consumed solar electricity.

Typical applications

• Planning PV systems for commercial, industrial, or Agri-PV projects
• Combination with Battery Energy Storage Systems (BESS) to utilize large PV capacities efficiently
Grid connection planning for projects with high feed-in potential
Profitability calculations such as ROI or levelized cost of electricity (LCOE)
• Capacity-based energy management and load shifting

Key figures

Installed capacity (kWp/MWp): standard metric used to describe PV system size
Specific yield (kWh/kWp): annual electricity generation per installed unit
Space requirement: approx. 6–8 m² per kWp, depending on module type
Full-load hours: equivalent operating hours at maximum output
Share of total electricity demand: portion of consumption covered by solar capacity

Summary

Solar capacity is the central planning parameter of any photovoltaic system. It determines how much renewable electricity can potentially be generated — both for self-consumption and grid feed-in.

It therefore forms a key basis for potential analyses, cost savings calculations, and the sizing of Battery Energy Storage Systems.