Photovoltaic Energy Storage System Maintenance Guide: Panels, Batteries & Equipment

Photovoltaic Panel Cleaning and Maintenance

• Cleaning Frequency: In dusty areas, cleaning monthly is recommended; in cleaner environments, at least quarterly.
• Cleaning Time: Choose cloudy days or early/late morning/evening when sunlight is less intense.  Direct sunlight can cause the panel surface to heat up, potentially damaging the panel during cleaning.
• Cleaning Tools and Methods: Use a soft brush, such as a boar-bristle brush, with a specialized photovoltaic panel cleaning solution. Gently brush from top to bottom, left to right. For stubborn stains, soak with the cleaning solution for a short time before gently wiping. Avoid using hard tools to prevent scratching the protective film on the panel surface.

Battery Inspection and Maintenance

Lead-Acid Batteries

• Fluid Level Check: Regularly check the electrolyte level by opening the battery vents. The level should be between the upper and lower limits; if too low, add distilled water or specialized lead-acid battery electrolyte.
• Visual Inspection: Carefully inspect the battery casing for deformation, cracks, or leaks. Replace the battery immediately if any problems are found to prevent system malfunction and environmental pollution from electrolyte leakage.
• Charge/Discharge Management: Strictly control the depth of discharge to avoid over-discharging. Generally, it is recommended that the depth of discharge for lead-acid batteries should not exceed 80%. Over-discharging accelerates sulfation of the battery plates, shortening the battery's lifespan. Additionally, avoid prolonged overcharging; disconnect the charger immediately after the battery is fully charged.

Lithium Batteries

• Temperature Monitoring: Lithium batteries are sensitive to operating temperature; the optimal operating temperature range is 0-40°C. Temperatures outside this range can affect battery performance and lifespan. Install a temperature monitoring device to take cooling or heating measures promptly when temperatures deviate from the optimal range.
• Charge/Discharge Status Monitoring: Use a Battery Management System (BMS) to monitor the charge/discharge status of the lithium battery in real time, including voltage, current, and state of charge. The BMS effectively prevents overcharging, over-discharging, and overcurrent, ensuring safe and stable operation.
• Balancing Maintenance: Regularly balance the lithium battery pack.  Due to performance differences among individual cells, prolonged use can lead to some cells overcharging or over-discharging. Balancing maintenance ensures consistent charge levels across all cells, extending the overall lifespan of the battery pack.

Regular Equipment Inspection

• Wiring Inspection: Check all wiring connections for tightness, looseness, aging, or damage. Tighten loose connections; replace aged or damaged wires immediately to prevent electrical leakage, short circuits, and other safety hazards.
• Inverter Inspection: The inverter is a key device that converts DC to AC; regular inspection of its operating status is essential. Check the inverter's display screen to confirm that parameters such as output voltage, current, and frequency are normal. Also, check that the inverter's cooling fan is operating correctly and that there are no unusual odors or noises. If problems are found, contact a professional technician for repair.
• Instrument and Controller Inspection: Check the accuracy of readings on various instruments (voltage meter, ammeter, power meter, etc.) and verify that the controller settings are correct. Ensure the system's monitoring and control functions are working correctly to detect and address any abnormalities promptly. 

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