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Will My Solar Still Work On Cloudy Or Rainy Days?

Updated: Oct 13, 2022

Did you know Vietnam has great potential in very high solar radiation compared with other countries in the world, the average in Hochiminh city as globalsolaratlas.info in 2021 can reach to 1837 kW/m2/year. Which is why for using the abundant sunshine to power your home and heat your water makes so much sense.


But despite the growing popularity of solar, there’s one question we’re often asked; “Will my solar system still work if the sun isn’t shining?”


The short answer is yes. In this article, we will explore how solar still works to reduce your energy consumption and carbon emissions even on cloudy or rainy days. Let’s start with solar hot water before we move to solar power.



Does solar hot water work on cloudy or rainy days?


A solar water heater will still deliver hot water on cloudy and wet days.


Anyone who has ever been sunburnt on an overcast day knows that it takes more than a few clouds to block out the sun. While clouds may filter out some of the brightness, the majority of sunlight still gets through. So if you have solar hot water collectors on your rooftop, rest assured, they’re still working to produce hot water even on those wet and cloudy days.


However, continuous days of cloudy weather can sometimes reduce the efficiency of your solar water heater. Fortunately, Solahart Solar Hot Water systems have a backup available to ensure you can still enjoy instant hot water when the sun isn’t shining.


All Solahart Solar Water Heaters come with an inbuilt electric booster. This means that as soon as the water temperature drops below a certain level, the booster element kicks in and heats the water to the correct temperature.

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