What maintenance is required for solar panels in series arrays?

Series Array Maintenance Considerations

When maintaining solar panels in series arrays, it’s essential to consider the impact of shadowing on the entire system. Series arrays are more susceptible to voltage drop caused by shading because the voltage of each panel is added together. If one panel is shaded, it can cause a significant drop in voltage for the entire string.

To minimize the effects of shadowing, ensure that panels are installed at a reasonable angle to allow snow to slide off and that trees or other obstructions are not casting shadows on the panels during peak sun hours. Typically, an 8% reduction in power output can be expected for every 10% reduction in panel exposure to sunlight.

Regular Maintenance Tasks

Regular maintenance tasks for solar panels in series arrays should include:

• Cleaning the panels with a soft-bristled brush or a low-pressure water spray to remove dirt, dust, and debris that can reduce efficiency.
• Checking the system’s voltage and current to ensure it remains within safe limits, typically between 18 and 35 volts per string.
• Inspecting the wiring and connections for signs of wear or damage, and replacing them as needed.

It’s also essential to check the system’s monitoring data to identify any potential issues, such as voltage drops or temperature fluctuations, which can indicate a problem with the solar panel or wiring.