Winter is a challenging season for RV solar systems. Lower solar altitude, shorter daylight hours, and rain and snow can all impact photovoltaic power generation. For RV users who rely on solar energy for lighting, appliances, and auxiliary equipment, finding ways to maximize usable energy under limited sunlight is a crucial concern.
Traditional rooftop photovoltaic panels and CIGS flexible solar awnings each have their advantages. The latter's value lies not only in power generation, but also in its flexible installation location, deployable structure, and the combined function of shading and power generation.
I. What challenges does solar power generation in RVs face in winter?
1. Shorter daylight hours and lower solar altitude angle
In winter, the sun's altitude angle is lower, and the angle of sunlight incidence changes, meaning that fixedly installed photovoltaic panels may not always be in the ideal position to receive sunlight. At the same time, the reduced sunshine hours also mean that the time available for power generation each day is shorter.
2. Snow accumulation may shade photovoltaic modules.
In cold regions, snow cover can block sunlight from reaching photovoltaic modules, leading to a decrease in power generation and, in severe cases, a temporary halt to power generation. Rooftop photovoltaic panels require particular attention to snow accumulation, snow removal conditions, and structural load-bearing capacity.
3. Cloudy and low-light conditions increase the uncertainty of power generation.
Winter weather is characterized by frequent cloud cover, fog, and snowfall, which can significantly reduce actual solar irradiance. Consequently, the output power of photovoltaic modules typically decreases as well, so their winter performance cannot be judged solely by their rated power.
II. CIGS Flexible Solar RV Awnings: More Than Just Component Materials
Traditional rooftop solar systems fix solar panels to the roof of the vehicle. Their advantages include structural stability, fixed installation location, and suitability for long-term power generation. However, for Van Life users who need to balance interior space, rooftop equipment layout, and outdoor activities, the fixed roof area is not always sufficient.
CIGS flexible photovoltaic awnings integrate power generation components into the awning fabric, enabling shading and power generation to be achieved in the same system.
Traditional car roof crystalline silicon photovoltaic panels :
l Fixed to the roof of the vehicle, suitable for continuous power generation
l It can work without unfolding the awning.
l Snow on the roof or other obstructions can affect power generation.
l Limited by available roof area
CIGS Flexible Photovoltaic Awning
l Combining power generation and sunshade functions
l When unfolded, the space on the side of the vehicle can be utilized.
l The vehicle's orientation and the way the sunshade is used can be adjusted according to the actual parking environment.
l When folded up, it no longer occupies the side space that is in the unfolded state.
The real difference here is that CIGS awnings offer an alternative way to arrange solar modules, rather than guaranteeing more power generation than crystalline silicon panels in all weather conditions.
If the roof is covered with snow, and the awning is up and the fabric surface is not covered by snow, then the awning may continue to receive sunlight.
III. Actual power generation data in winter: Which conclusions are scientifically based?
For RV owners looking to purchase winter solar power systems, the most valuable data is that which describes the testing conditions, irradiance, and actual output power.
An outdoor study published in *Energy Science & Engineering* in 2022 measured the performance of flexible CIGS modules under different installation angles and weather conditions. The study, conducted in Daejeon, South Korea, involved CIGS modules installed at 30° tilt and 90° vertically . The study found that vertically installed CIGS modules exhibited similar performance to tilted-installed modules in February, but differences in power generation occurred in other months. ( Performance evaluation of flexible CIGS modules based on operational data under outdoor conditions - Lee - 2022 - Energy Science & Engineering - Wiley Online Library )
The study also recorded a set of irradiation variation tests:
|
Test Project |
Condition A |
Condition B |
|
Irradiation intensity |
Approximately 543 W/m² |
Approximately 229–236 W/m² |
|
Maximum output power Pmax |
Approximately 37.4 W |
Approximately 13.8–14.2 W |
|
Performance Ratio PR |
Approximately 0.86 |
Approximately 0.75 |
|
Weather changes |
Higher radiation |
Increased cloud cover and higher proportion of scattered light |
This test compares irradiation conditions at different times, not a direct comparison between CIGS and crystalline silicon under the same conditions.
This data shows that the actual output power of CIGS decreases significantly as irradiation intensity decreases. It cannot be used to prove that CIGS is necessarily superior to crystalline silicon under low light conditions.
Therefore, for CIGS flexible photovoltaic awnings, a more reliable product validation method is to verify two things simultaneously:
l Component performance: How much electrical energy can the system output under conditions of low radiation, low temperature and diffused light in winter?
l Installation advantages: When the rooftop solar panels are blocked by snow, can the unfolded, unobstructed awning provide an additional source of power generation?
These two issues need to be tested separately to accurately measure the product's winter value.
IV. Why might the deployment angle and installation location affect power generation in winter?
As the solar altitude angle decreases in winter, the relationship between the orientation of the component surface and sunlight becomes more important.
For example, in the Northern Hemisphere winter, the sun typically shines from the southern sky. Assuming the vehicle is parked in a suitable location, the user can adjust the vehicle's orientation and deploy the awning to allow the components to receive more favorable sunlight.
Compared to components fixed to a horizontal roof, an unfolded awning has the potential to change the direction of the light-receiving surface.
|
Usage Environment |
Rooftop solar panels |
CIGS Photovoltaic Awning |
|
The roof was free of snow and there was plenty of sunlight. |
Normal power generation |
It can generate electricity when deployed. |
|
The roof of the car was covered with snow. |
Power generation may decline significantly. |
If the fabric is unobstructed, it can provide additional power generation. |
|
Vehicles parked in the shade of buildings or trees |
Power generation affected |
It may also be affected , but the impact will be lower. |
|
Sunny winter days with low-angle sunlight |
Depending on the roof orientation and component design |
The light-receiving surface can be adjusted according to parking conditions. |
|
Strong winds, blizzards, or icy conditions |
Snow load and equipment protection need to be considered. |
The tent should be taken down promptly according to product requirements. |
It is important to emphasize that awnings should not be used at the expense of safety in order to generate electricity. In strong winds, blizzards, and icy conditions, the usage restrictions specified in the product guidelines should be followed; if weather conditions are unsuitable for deployment, they should not be used for the purpose of obtaining solar energy.
V. What else should be considered besides power generation when traveling in a motorhome during winter?
Even if the solar panels are able to generate electricity normally, it does not mean that they can independently meet all the electricity needs in winter.
RV users need to consider the following factors in winter:
l Battery capacity: During consecutive cloudy days, the energy storage system needs to provide power for a longer period of time.
l Energy management: Prioritize the supply of necessary loads such as refrigerators, lighting, and communication equipment, and make reasonable arrangements for the use of high-power devices.
l Component obstruction: Regularly check the roof and awning surfaces for snow, leaves, or other obstructions.
l System compatibility: Confirm that the voltage, current, and power requirements of the photovoltaic modules, cells, controllers, and inverters are compatible.
l Safe storage: When weather conditions are not suitable for deploying the sunshade, it should be retracted in time. The need for power generation should not be put above structural safety.
For RV owners who frequently travel in Europe during the winter, a reasonable approach is to use CIGS photovoltaic awnings as a supplement to or part of their vehicle's solar energy system.
VI . FAQ: Frequently Asked Questions about CIGS Photovoltaic Awnings in Winter
Q1: Does CIGS always generate more electricity than crystalline silicon panels on cloudy days?
Not necessarily. The low-light performance of different modules is affected by factors such as cell structure, irradiance, module temperature, and system design. Current research does not support the claim that CIGS outperforms crystalline silicon under all low-light conditions .
Q2: If the crystalline silicon roof panel is covered by snow, can the CIGS awning still generate electricity?
If the awning is already deployed and its surface is not obstructed by snow or other objects, it may continue to generate electricity. However, the actual output depends on sunlight, module angle, and system operating conditions.
Q3: Are CIGS flexible modules suitable for low-temperature environments in winter?
It is necessary to examine the component's operating temperature range, temperature coefficient, encapsulation materials, bending requirements, and low-temperature durability simultaneously. One cannot conclude that the entire awning can adapt to all winter environments solely based on the CIGS material type.
Q4: Should I choose a CIGS Awning or a crystalline silicon roof panel for winter?
If users require a fixed solar system, rooftop crystalline silicon panels remain a worthwhile option. However, if users wish to expand their outdoor shading space and obtain additional power generation area under suitable weather conditions, CIGS photovoltaic awnings offer different system design approaches.
The two can also be combined based on vehicle structure, budget, and power requirements.
Conclusion: The key to winter solar power strategies is to adapt the power generation system to the actual usage environment.
For Van Life in winter, the real challenge is not choosing a solar technology that is better in all environments, but rather minimizing snow cover, making the most of limited sunlight, and ensuring the stable and safe operation of the entire system.
The core value of CIGS flexible photovoltaic awnings lies in combining solar power generation with outdoor living spaces and providing RVs with an installation method different from fixed rooftop solar panels. When snow accumulation on the roof affects the power generation of traditional modules, and the awning can be safely deployed to obtain unobstructed sunlight, it has the potential to supplement the vehicle's battery with additional power.
For photovoltaic awning products like AWNLUX, the most convincing approach going forward is to use test data from mass-produced products in real winter environments to demonstrate their actual performance under different irradiance conditions, installation angles, and snow cover scenarios.
The Winter Solar Strategy doesn't promise that CIGS will outperform in any weather, but rather, through a well-designed system, it provides RVs with more power generation options during the winter.
References
3. Solar Photovoltaic Hardening for Resilience – Winter Weather | Department of Energy