What is the reason for the solar inverter alarm

What is the reason for the solar inverter alarm?

The main reasons for solar inverter alarms include:

Photovoltaic string short circuit to ground: This is one of the most common reasons. It may be due to quality problems during the construction process, such as unqualified cables, low insulation performance, human-induced damage, or connecting terminals that are not protected against water intrusion. ‌

External environmental impact: For example, rainy days or humid environments may lead to low insulation resistance. Especially in fishery and photovoltaic complementary projects, ambient humidity has a great impact on insulation performance.

Internal problems of the inverter: For example, there is a short circuit between the cables and the chassis inside the inverter, the internal insulation resistance detection device is damaged, etc.

Failed to read and write EEPROM: This can usually be solved by restarting the inverter. ‌

Fan alarm: Check whether the fan is stuck by foreign objects, manually stir the fan and restart the inverter.

No mains connection: Check whether the AC side line connection is good and whether the AC switch is closed.

Over-temperature alarm: It is usually caused by insufficient ventilation or sun exposure. It is necessary to ensure that the installation area of ​​the inverter is ventilated to avoid sun exposure.

Battery problem: The battery capacity is too small or the inverter is heavily loaded, which may cause an undervoltage alarm. ‌

Output short circuit or overload: This may cause protection action, which can be solved by resetting

Solution:

String-by-string inspection: If the DC side of the inverter has multiple access points, the components can be tested one by one.

Use a multimeter: When all AC and DC are disconnected, use the positive and negative poles of the multimeter to measure the inverter voltage to ground respectively.

On-site inspection: Carefully check the DC cables and grounding conditions of the components, especially the cables laid in corners and in the open air.

Use professional equipment: Use a megger or other professional equipment to detect the PV+/PV- ground insulation resistance on the module side string by string.

Restart the inverter: For failures in reading and writing EEPROM or fan alarms, restart the inverter to fix the problem.

Check the fan and line connection: For fan alarms or no mains connection alarms, check the fan and AC side line connections.

Improve ventilation conditions: For over-temperature alarms, ensure ventilation where the inverter is installed to avoid exposure to the sun.

Check the battery and output wiring: For battery problems or output short circuit/overload, check the battery and output wiring.