Accuracy: The current sensing resistor needs to be able to accurately measure the current flowing through the photovoltaic inverter to ensure that the inverter's control algorithm can accurately perform maximum power point tracking (MPPT) and system protection. Accuracy is usually expressed as a percentage of error, such as ± 1% or ± 2%. Stability: CSR should maintain stable performance under different temperatures and working conditions, unaffected by environmental changes. This includes maintaining its accuracy even under extreme temperatures, humidity, and mechanical stress. Response time: Under dynamic working conditions, such as the output changes of photovoltaic arrays under changes in sunlight, CSR needs to quickly respond to changes in current in order for the inverter to adjust its working state in a timely manner. Linearity: The output signal of CSR should have a linear relationship with the current flowing through it, in order to accurately measure currents of different sizes. Long term reliability: CSR needs to maintain the performance of photovoltaic inverters throughout their entire service life, without reducing accuracy due to aging or fatigue. Electromagnetic compatibility: Photovoltaic inverters are subject to electromagnetic interference in the power grid during operation, and CSR needs to have sufficient anti-interference capabilities to ensure measurement accuracy. Insulation performance: CSR needs to have good insulation performance to prevent breakdown or leakage under high voltage and ensure the safe operation of the system.