Photovoltaic inverters showing low insulation impedance are usually caused by some problems in the system. To solve this problem, we need to take some measures to improve the insulation impedance and ensure the normal operation and safety of the system. Here are some possible solutions:

I. Check components and wiring
First check the photovoltaic modules and lines for damage or aging, which may lead to reduced insulation impedance. If the problem is found, it needs to be replaced or repaired in time.

Ii. Cleaning and maintenance
Clean and maintain photovoltaic modules regularly to ensure that their surfaces are clean and free of dust or dirt buildup. This preserves component performance and improves insulation impedance.

Three. Ground connection
Check that the ground cable is securely connected and that the electrical grounding meets standards. If the grounding is bad, the insulation impedance is low, and you need to repair it in time.

Four. Alarm system
Install an alarm system to monitor changes in insulation impedance and alarm in time. This allows problems to be identified in advance and measures to be taken to deal with them.

5. Regular testing
Regularly carry out insulation resistance test of photovoltaic inverter, and deal with problems in time. It is recommended to test the insulation resistance at least once a year.

6. Adjust parameters
Adjust the parameters of the photovoltaic inverter according to the actual situation to ensure its stable work and improve the insulation impedance.

       To sum up, the solution to the problem of low insulation impedance of photovoltaic inverters requires comprehensive consideration of components, lines, grounding, monitoring and other factors, and regular testing and maintenance. Only by maintaining the normal operation of the system can we ensure the safe and efficient operation of the photovoltaic power station. I hope the above information is helpful to you.