Why is the PV generation low

Created by Lee Dobson, Modified on Thu, 14 Aug at 12:27 PM by Jorge Ruiz Padilla

Numerous factors contribute to low power generation, such as weather, temperature, shading, inverter issues, panel orientation, panel angle, and more.

External issues:

  • Weather: Conditions like fog, rain, clouds, and adverse weather can lead to reduced power generation.
  • Temperature: Extreme high or low temperatures can diminish the efficiency and power output of the panels.
  • Shading: It's essential to evaluate the site environment, which includes nearby trees, utility poles, water tanks, clothing, bird droppings, and the spacing between panels. Any obstruction covering the panels will lower the efficiency of the entire system.
  • Panels: It is not permitted to connect different types of solar panels on the same string. Be aware that any damage to a battery panel will drastically impact the power generation of the entire system, so it's crucial to replace damaged panels promptly.
  • Panel Orientation: Ensure that the panels are positioned at the optimal angle. Typically, the peak of solar power generation occurs between 11:00 AM and 2:00 PM.
  • Grid: Fluctuations in grid voltage and frequency can occur frequently, and reliable grid quality is critical for the smooth functioning of the inverter. Be aware that such fluctuations can impact the inverter’s power generation and may even result in inverter errors. Additionally, nearby high-power consumption can affect the inverter's output.

Inverter issues:

  • Inverter Clipping: This occurs when the system cannot export excess photovoltaic energy back to the grid after meeting the load and fully charging the batteries. Consequently, the system only draws what the property requires from the panels. There are two possibilities in this situation:
    • Solar Export/Solar Sell is disabled in the inverter/LifeLynk settings.
    • The system is either not connected to the grid or has been disconnected from it.
  • CT issues (Not pointing towards the right direction, interference)
  • Max Solar Power setting has a small value.

Battery issues:

  • Battery Problems: If there is a voltage discrepancy of more than 1.5 volts between the inverter battery terminals and the BMS voltage (More information here), the inverter will halt PV production until the issue is resolved.

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