There could be several reasons why your split 240V air conditioner compressor is not starting with solar power. Some possible explanations include:
Insufficient solar power output: If your solar power system is not generating enough electricity to meet the air conditioner's starting power requirements, the compressor may fail to start. Air conditioners typically require a significant surge of power when starting up, and if the solar system's output is insufficient, it may not be able to provide the necessary energy.
Inverter capacity: The inverter that converts DC power from the solar panels to AC power for your home might not have the capacity to handle the starting surge of the air conditioner. Inverters are rated for a certain capacity, and if it is not high enough to handle the initial power spike, the compressor may not start.
Inverter compatibility: Some air conditioners are not compatible with certain types of inverters, especially if they use advanced inverter technology themselves. Incompatibility issues can prevent the air conditioner from starting when running on solar power.
System settings: Certain air conditioning systems have settings that prevent them from starting when they detect fluctuations in the power source. This is a protective measure to avoid damage to the equipment. If your solar power system has intermittent fluctuations or is not providing a stable power supply, the air conditioner may not start.
Wiring or connection issues: Faulty or improper wiring connections between the solar power system, inverter, and air conditioner can also cause problems. Loose or damaged connections can disrupt the power flow and prevent the compressor from starting.
Battery backup (if applicable): If your solar power system has a battery backup, the air conditioner might not be set up to draw power from the battery. Some systems are designed to prioritize certain loads over others, and the air conditioner might not be configured to use battery power.
To resolve the issue, you may need to consult with a qualified solar power system technician or an HVAC professional. They can assess your system, check for any compatibility or capacity issues, and make the necessary adjustments or repairs to ensure that your air conditioner operates correctly with solar power.