# Configuration check

The quality of the connection can be assessed with the configuration check.
The system checks whether all relevant currents, voltages and powers are within the specified limits.

### Configuration check inverter

- The current of the PV generator
- must not exceed the maximum short-circuit current of the inverter (prohibited range). If it is exceeded, a corresponding error appears and it cannot be simulated.
- should not exceed the maximum input current of the inverter (blocking range). In this range, regulation losses are to be expected. The losses can be analysed in the energy balance after the simulation.

- The dimensioning factor is the ratio between the nominal PV power installed on the DC side and the output power of the inverter on the AC side. As a rule, it should not be smaller than 100%. With dimensioning factors of more than 115%, it is recommended to calculate with radiation data resolved per minute, as high control losses can occur.

### Configuration check MPP-Tracker

- The MPP voltage of the PV generator must be within the MPP voltage limits of the inverter or its MPP trackers. For this, the MPP voltage of the PV generator at 70°C and 1000 W/m² is taken as a minimum and that at 15°C and 1000 W/m² as a maximum.
- The open circuit voltage of the PV generator must not exceed the maximum system voltage. The maximum open circuit voltage of the PV generator is calculated at -10°C and 1000 W/m².
- The STC current of the PV generator
- must not exceed the maximum short-circuit current of the MPP tracker (prohibited range). If it is exceeded, a corresponding error appears and it cannot be simulated.
- should not exceed the maximum input current of the MPP tracker (blocking range). In this range, regulation losses are to be expected. The losses can be analysed in the energy balance after the simulation.

- The maximum input power of the MPP tracker can be exceeded, as the STC power of the PV generator is not often reached in practice. However, depending on the overdimensioning, regulation losses are to be expected here.

The temperatures and irradiances on which the calculation is based upon can be adjusted under configuration limits.

See also