The drip performance of polycarbonate greenhouse panels is also a major factor affecting the light transmission performance of solar greenhouses. Dripping refers to the large amount of water vapor condensing into dew on the top or around the PC solar panels within the greenhouse. Most PC solar panels from various brands lack a drip-proof feature. Although some PC solar panels come with a built-in anti-drip function initially, this feature tends to wear off over time, failing to match the lifespan of the panels.

In fact, the waterproof performance of most PC solar panels fades within the first 1-2 years (even a few months) of use. Over a longer lifespan, cracks and dripping may appear on greenhouse roofs (moisture inside the greenhouse contacts the panels to form condensation), which can harm the greenhouse's light transmission and operational performance. The resulting losses to production are self-evident.

Is it a new raw material?

The new polycarbonate greenhouse material boasts features such as transparency, impact resistance, lightweight, flame retardancy, sound insulation, and weather resistance. If the greenhouse panels are produced without the use of this new material, but instead with recycled old materials or unknown raw materials, the quality of the panels will be compromised, and the greenhouse constructed with such panels will not be suitable for long-term use.

Does it have a moisture-proof layer?

Due to the significant temperature difference between the inside and outside of greenhouses, moisture condenses at the top, forming tiny droplets that reduce the sunlight transmission rate and cause further condensation. Over time, the plants inside the greenhouse can become sick. Therefore, Shouguang Jiuhé Agriculture recommends using waterproofing solar panels when constructing greenhouses. The waterproofing principle is that the anti-fog layer at the bottom of the waterproofing solar panels allows moisture in the air to condense evenly into tiny droplets on the panel, which then slide down the slanting surface (panel rib direction) to the edge instead of dripping directly, thereby achieving the effect of preventing water droplets from falling.

3. UVA/UVB Radiation Protective Layer

It is widely known that without a radiation barrier, the ultraviolet radiation from the sun can damage the panels, leading to yellowing and weathering of the solar panels. A UV radiation protective layer can effectively resist the damage from ultraviolet rays. By co-extruding a 50-micron UV layer on the surface of solar panels, it can prevent yellowing as effectively as a 5μm UV layer each year. Therefore, choosing a sunlight board greenhouse solar panel with a radiation protective layer is quite important.