DC Nominal Power
DC Nominal Power (from English Direct Current Rated Power) is a key concept in photovoltaics. It indicates the maximum electrical power a photovoltaic system can generate under optimal conditions (strong sunlight, optimal module temperature) in the form of direct current (DC). This value is measured in watts (W).
Importance of DC Nominal Power
- System Sizing: The DC rated power is crucial for sizing a photovoltaic system. It determines the size of the required inverter, which converts the generated direct current into usable alternating current.
- Performance: It is a measure of the basic performance of a photovoltaic system. However, the actual power generated depends on various factors, such as sunlight, module temperature, module cleanliness, and inverter efficiency.
- Comparability: The DC rated power allows for an easy comparison of different photovoltaic systems.
Relationship with AC Power
The AC Power (alternating current power) is the electrical power that actually reaches the consumer after the inverter has converted the direct current. It is usually slightly lower than the DC rated power, as there are always losses during the conversion process.
Influencing Factors
- Module Technology: The efficiency of the solar modules used directly affects the DC rated power.
- Number and Size of Modules: A larger number or larger modules generally lead to a higher DC rated power.
- Operating Conditions: Sunlight, temperature, and module cleanliness have a direct impact on the actual power generated.
Conclusion
The DC rated power is an important parameter for the planning and operation of photovoltaic systems. Although it indicates the maximum theoretical power that a system can generate, the actual power is influenced by numerous factors.
Additional Terms: Inverter, Solar Modules, Energy Yield, Feed-in Tariff, Battery Storage
