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2. Surface Temperature
The surface temperature of the solar panel aects the power performance of the solar panel. The lower the surface
temperature, the better the power performance. For example, when using solar panels in winter, the power is usually
higher than in summer. Solar panels generally reach temperatures close to 60°C (140°F) during summer. This reduces
nominal power by 10–15%, despite the higher levels of light shining on the panel.
3. Light Angle
When the solar panel and the light angle are perpendicular, better power performance can be obtained. However,
under special installation conditions (such as the roof of an RV), the solar panel can only be used in a tiled manner,
which makes it impossible to form a vertical angle with the sunlight, resulting in a power loss of about 5–15%.
4. Light Occlusion
When using solar panels, try to ensure that the surface is not covered, including projection, foreign objects, glass,
etc., which will cause a signicant drop in power.
If all of the above conditions are met, but the power used is much smaller than the nominal value, it may
be a fault situation. In this case, you can contact EcoFlow customer service for assistance.
What is the power range that a 400W solar panel can typically achieve?
On a sunny day without clouds and direct sunlight, the power range of a 400W solar panel is between 320–350W
(this data is obtained under the conditions of irradiance of 800–900W/m2 and the panel surface at 50°C (122°F)).
The nominal data of the solar panel is obtained by testing under the conditions of AM1.5, meteorological conditions
of 1000W/m2, and panel surface temperature of 25°C (77°F). A power close to the nominal value can usually be
reached at midday on a sunny day in winter.
What is the operating temperature range of the solar panels?
Please refer to the content in How to Choose the Installation Environment How to Choose the Installation Environment in this manual.
What are the precautions for the use of solar panels?
The solar panel is made of monocrystalline silicon wafer. During installation and use, please do not drop it on the
ground with force, or use tools to hit the surface. Do not step on or sit on the solar panel, so as not to cause the
monocrystalline silicon wafer to break and aect its use. Articial damages will void the warranty.
Can I use solar panels of dierent specications for mixed use?
Yes, but it is not recommended. Dierent energy storage controllers have requirements and restrictions on the
output of solar panels. When solar panels with different current values are used in series, they will be limited,
resulting in the inability to release the output power and even the short-board eect of 1+1<2.
Can I connect solar panels in parallel?
Yes. Parallel connection can double the current and increase the power. You can refer to the requirements for solar
controllers and energy storage devices to ensure that they support larger values of input current to better determine the
number of parallel connected solar panels. Additionally, it is necessary to pay attention to select a wire with a suitable wire
diameter for safe connection according to the change of the output current.
Do solar panels need to be cleaned frequently?
Yes. When used outdoors for a long time, solar panels are prone to accumulate dust and foreign objects on the
surface, causing a certain degree of light occlusion and reducing the output of power generation. Frequent cleaning
keeps the surface of the solar panel clean and free of obstructions, allowing for better solar panel power output.
