The lighting time is short. After using solar street lights for a period of time, even if there is sufficient light, it is possible that the lighting time may be short, and it is not possible to provide lighting normally on rainy days. Most likely, there is a problem with the battery, and its storage capacity has decreased, which naturally leads to insufficient storage. It is necessary to replace the supporting battery in a timely manner, and the parameters should be appropriate. The abnormal mains voltage of photovoltaic inverters can be divided into low or high mains voltage, low or high mains frequency. Confirm whether the safety standards selected for the machine meet the local power grid requirements, check whether the AC output terminals are reliably connected, and use a multimeter to measure whether the voltage is normal. Disconnect the PV input, restart the machine, observe if the machine can return to normal, and if the fault is not resolved, contact the distributor. Monitoring without data, WiFi monitoring, connect inverter WiFi, check if there is an inverter connected on the monitoring page. If there is no inverter information, plug and unplug the built-in WiFi module or check the external WiFi RS485 connection; If the inverter WiFi cannot be found, please check if the internal WiFi module has poor contact or if the external WiFi is not powered on. The inverter does not respond when turned on. Please ensure that the DC input line is not connected in reverse. Generally, the DC connector has a foolproof effect, but the crimping terminal has no foolproof effect. It is important to carefully read the inverter manual to ensure that the positive and negative poles are connected before crimping. The inverter is equipped with reverse short-circuit protection, which can start normally after restoring normal wiring. Photovoltaic power grid faults require strict requirements for grid voltage, grid waveform, and grid distance for inverters during the early investigation of grid overload. Most of the reasons for the occurrence of overvoltage problems in the power grid are that the light load voltage of the original power grid exceeds or approaches the safety protection value. If the parallel line is too long or poorly crimped, resulting in excessive impedance/inductance of the line, the power station cannot operate normally and stably. The solution is to coordinate the voltage with the power supply bureau or select the correct grid connection and strictly control the quality of power station construction.