Imp, or peak current, is the electrical current that a solar module generates when it is operating at its highest output. This parameter is a key indicator of the efficiency and performance of a solar panel , helping you understand how much power the module can produce under optimal conditions.
What is the role of Imp?
Maximum Power Point (MPP): Imp is the point where the combination of current and voltage (Vmp – voltage measured at maximum power) produced by the solar module gives the highest power (Pmax).
Formula: P max = Sun sec × I sec
Efficiency Definition: The Imp value is directly related to the amount of energy generated by a solar panel. The higher the Imp, the more electricity the module can produce.
Factors affecting the value of Imp
Solar cell type: Different types of solar cells (e.g. monocrystalline , polycrystalline or thin film) may have different Imp values due to their technological characteristics.
Environmental factors:
- Light intensity: Higher sunlight intensity increases the Imp value because more photons are available to generate energy.
- Temperature: Higher temperatures generally reduce the Imp value as the internal resistance of the solar cell may increase.
Load: The load on the solar panel also affects the Imp value. Properly sized inverter and system components ensure that the solar panel operates at its MPP (Maximum Power Point).
Where is the value of Imp found?
The value of Imp is indicated on the solar module data sheet, which contains the technical specifications of the module.
The manufacturer guarantees that the Imp value is met under ideal conditions (STC – Standard Test Conditions) .
Example calculation
Let's assume that the maximum power (Pmax) of a solar module is 300 W, and the voltage measured at maximum power (Vmp) is 30 V. The value of Imp can be calculated as follows:
I sec = P today / Vmp = 300 W /30V = 10 THE
This means that the solar module produces 10 amps of current at its maximum output.
Summary
Imp (current measured at maximum power) is one of the most important parameters in determining the performance and efficiency of solar panels. It helps in the proper design of systems, selection of components and optimization of system performance. Knowing the value of Imp and its correct application contributes to the efficient and sustainable operation of solar panels.