Quick Answer
Solar panels can still generate electricity in cold weather, but their efficiency decreases as temperatures drop. The exact impact depends on the panel's temperature coefficient, which affects its power output at low temperatures. As a general rule, a 1% decrease in temperature can lead to a 0.45% decrease in power output.
Understanding Temperature Coefficients
When choosing solar panels for an RV, look for those with a low temperature coefficient, as this will help mitigate the effects of cold weather. For example, the Canadian Solar CS6K-345P, a popular choice for RVs, has a temperature coefficient of -0.39% per degree Celsius. This means that for every degree Celsius below 25°C, the panel’s power output will decrease by 0.39%. To put this into perspective, if the ambient temperature drops from 25°C to -10°C (a common scenario during winter months), the panel’s power output will decrease by around 4.65%.
Sizing Solar Panels for Cold Weather
To ensure your solar panel system can meet your energy demands in cold weather, it’s essential to size the system correctly. A good rule of thumb is to oversize the system by 10-20% to account for temperature-related losses. For example, if you need 1 kW of power at 25°C, you may want to consider a 1.2-1.4 kW system to ensure you have enough energy during winter months. Additionally, consider using a temperature-compensated charge controller to help optimize battery charging in cold weather.
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