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Q&A
Does the 220W Bifacial Solar Panel generate a full 220W of power?
In most cases, it is normal for a solar panel not to deliver its full nominal power. Some of the reasons why
this happens, as well as some suggestions for getting closer to the nominal power figure, are given below.
1. Light Intensity. The amount of light shining on the panel will result in fluctuations to the power output.
You are more likely to achieve nominal power output figures closer to those obtained under test conditions
when using the product on a clear day during the midday sun, than when using the product in the morning
or later in the afternoon. Weather conditions will also affect the amount of sunlight that shines on the panel.
For example, you are much less likely to achieve the figures for nominal power in hazy, cloudy or rainy
conditions.
2. Surface Temperature. The temperature of the solar panel surface will also affect the amount of power
generated. The lower the surface temperature of the panel, the more power will be produced. For example,
solar panels generate more power when used during the winter than during the summer, and this is
completely normal. Solar panels generally reach temperatures close to 60°C (140°F) during summer. This
reduces nominal power by 13%, despite the higher levels of light shining on the panel.
3. Sunlight Angle. In optimal light conditions, the sun's rays should remain perpendicular to the surface
of the panel for best performance. Power output is only marginally impacted by sunlight hitting the panel
within 10° either side this 90° angle.
4. Panel Shading. The surface of the solar panel should not be shaded during use. Shading caused by
shadows, foreign objects and glass can all greatly reduce power output.
Performance Issues Caused by Malfunctioning Panels: If the panel still isn't generating power or its output
remains far below expected nominal power figures after addressing the issues above, there may be an issue
with the panel itself. Please contact Customer Support for assistance.
How much power can the 220W Bifacial Solar Panel generate under normal conditions?
This depends first and foremost on weather conditions. Generally speaking, on a clear day with no clouds
in the sky, sunlight hitting the panel at a 90° angle usually generates 160W–180W of power in the 220W
panel. (Current light conditions are normally 800W–900W/m² (74.3W–83.6W/ft²) with a panel temperature
of 50°C (122°F) under test conditions. Nominal power ratings are based on 1000W/m² (92.9W/ft²) in AM1.5
conditions with a panel temperature of 25°C (77°F) under test conditions. Power output figures close
nominal values were normally observed in the midday sun during the winter.)
What should I know about the operating temperature, storage and use of the 220W
Bifacial Solar Panel?
The operating temperature of the Bifacial Solar Panel is -20°C–85°C (-4°F–185°F). The panel should be
folded into its original shape and stored in its Protective Case (Kickstand), which provides sufficient
protection for the product. To extend the service life of the panel, ensure that the product is not exposed to
external forces/impacts when not in use. The solar panel itself is made of glass and must not be dropped,
pierced, bent, or sat on. These actions may break the glass and render the panel unusable. Any such
damage will not be covered by the free warranty.
The 220W Bifacial Solar Panel has two sides. How can I tell which side is which, and how
can I optimize power generation using the rear side of the panel?
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