Solar Powered Ventilation

Solar Powered Fans myth and marketing deception

Solar powered fans are rated according to fan displacement at maximum speed in free air conditions.

That is a fan in a tube, with nothing on top and nothing below, at maximum speed which would be ostensibly at full light and not necessarily driven by the solar panel accompanying the fan when presented to you as a product.

The minute the flow encounters resistance, like the cap on a solar fan roof ventilator or the free air available on the intake side, performance values are well short of those claimed. Add the variances of light available on the day you can reduce those ratings further again until they are only a fraction of what is claimed possible.

The solar panel is the energy side of this equation so look at the life expectancy as claimed by the manufacturer or the marketing company. There’s no point to going to the trouble of installing the unit just to find some months later that you have is a solar powered frittata because if the warranty doesn’t cover the labour you’re going to be up for the same costs again and again….or until you fall off the roof.

And after all of that remember…if you don’t have a roof ventilator that works at night….which is when you really need it for the evening purge….then you don’t have the product you need.

In the meantime they’ve got your money and you’ve acquired an education even though it may be one you didn’t need.

This is where the calibre of guidance sought is important and an open mind whilst seeking it.




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