Quick Answer
To ensure proper drainage for bifacial panel installations, install a waterproofing membrane under the panel, ensure a slope of at least 2% for water run-off, and keep the ground around the panel clear of debris and vegetation.
Choosing the Right Drainage Method
When installing bifacial panels, it’s essential to select a drainage method that works for your site conditions. A common approach is to use a French drain system, which involves digging a trench and installing a perforated pipe to direct water away from the panel. For smaller installations, a simple slope of 2-3% can be sufficient, but for more significant projects, a drainage mat or membrane may be necessary to prevent water accumulation.
Installing Waterproofing Materials
To prevent water from seeping under the panel and causing damage, install a waterproofing membrane under the panel. This can be a sheet of EPDM (ethylene propylene diene monomer) rubber or a liquid-applied membrane. Make sure to apply the membrane according to the manufacturer’s instructions and ensure it is securely fastened to the ground. A minimum thickness of 1-2 mm is recommended for most installations.
Ground Preparation and Maintenance
Clear the ground around the panel of debris, vegetation, and any other objects that could interfere with drainage. Regularly inspect the area and remove any obstructions to ensure water can flow freely. It’s also essential to maintain the slope of the ground to prevent water from accumulating around the panel. A minimum slope of 2% is recommended, but this can be adjusted based on site conditions and local regulations.
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