Homes
Solar heat for suitable rooms and smaller buildings with a sunny wall.
Made in Scandinavia
Solar heat.
- Reduces heating costs
- Solar heat below −20°C
- Lowers relative humidity
- Helps reduce damp conditions
- Easy to install yourself
Fullblack Outdoor 0.75 m² circulates room air through a sun-heated collector and returns solar-warmed air indoors while useful sunlight is available.
More than a black box. Discover what makes Fullblack different.
Collector area0.75 m²
Panel dimensions100 × 75 × 3.5 cm
Weight6 kg
Stated airflow43 m³/h
Fan input6 W
Power options10 W solar · 5–12 V adapter
Designed for northern seasons
Low sun.
Snow-reflected light.
Low autumn, winter and spring sun can reach a suitably positioned wall-mounted collector at a favourable angle. Snow on the ground reflects extra sunlight towards it, which boosts heat output on sunny days.
Inside Fullblack, a thin, selective super-absorber captures sunlight, limits heat radiation and responds immediately when the sun appears.
More than 70% of annual output is produced during autumn, winter and spring. Actual output varies with location, orientation, shading, snow cover and weather.
Suitable applications
Practical spaces.
Visible results.
Cabins
Solar heat for suitable intermittently used buildings with a sunny wall.
Garages
A practical setting for solar heat and documented field observations.
Workshops
A direct, understandable installation for practical owners who can inspect the airflow.
Customer installations
Installed in real places.
A monochrome patchwork from our customer archive.
Some photographs show earlier Fullblack models in different sizes. They perform the same function as today's latest, updated and improved model.
Customer comments
What owners say.
English translations have been lightly shortened for clarity. These are individual customer experiences, not guaranteed results.
Manufacturer-stated performance
Built for
“northern light.”
as much useful heat as a photovoltaic panel powering resistance heating, under the stated comparison conditions.
estimated annual energy contribution in suitable installation and operating conditions.
solar-heated air when useful sunlight reaches Fullblack's selective super-absorber.
stated product warranty, subject to the complete warranty terms supplied before checkout.
Actual output, annual contribution and savings vary with available sunlight, orientation, shading, climate and the building.
Measure, then calculate
Turn temperature rise
into an estimate.
Using the stated airflow of 43 m³/h, this calculator estimates heating power and heat over your selected operating time.
Power formula
Q̇ = ΔT × 1.3 × 12
12 L/s = 43.2 m³/h (approximately 43 m³/h).
At 43 m³/h, each degree of temperature rise equals 15.6 W in this formula.
Fullblack Outdoor FAQ
Good to know.
How does Fullblack Outdoor work?
Room air is drawn through a wall duct, passes behind the solar-heated super-absorber and returns indoors as solar heat. Fullblack recirculates indoor air rather than drawing air from outdoors. It is not a fresh-air ventilation system and does not replace the building's ventilation. Pressure and moisture conditions depend on the whole ventilation system and the building.
Can I install it myself?
Yes. The key installation step is making 51 mm wall openings.
How is the fan powered?
The 10 W solar module is intended for unheated spaces or spaces kept at a low background temperature. It connects directly to the fan and automatically controls its speed so the air returned to the room is always warmer than the air drawn into the collector. With adapter operation, you set the start and stop temperatures yourself.
What does it cost to run with the adapter?
Just a few euros a year with the adapter, negligible compared with the value of the 1,000 kWh of heat produced.
Does it work in very cold weather?
Yes. Fullblack provides solar heat even at outdoor temperatures below −20°C when useful sunlight reaches the collector. Its selective super-absorber captures sunlight while limiting thermal radiation. Actual output depends on sunlight, airflow, heat losses and the installation.
Can snow increase heat output?
Yes. Snow on the ground can reflect additional sunlight towards the collector, while a low sun can favour a suitably oriented wall-mounted surface. This can increase heat output during sunny autumn, winter and spring conditions. The effect varies with snow cover, orientation, shading and weather; it does not mean that total winter energy is always higher than summer energy.
Where can it be installed?
Fullblack Outdoor mounts on an exterior wall and may be installed vertically or horizontally where the wall, interior room and solar exposure are suitable. Homes, cabins, garages, workshops and storage buildings are common applications.
How much energy can it contribute?
The manufacturer estimates an annual contribution of up to 1,000 kWh, with more than 70% of annual output produced during autumn, winter and spring.
Does the fan run all the time?
No. With adapter operation, you set the fan's start and stop temperatures yourself.
What is the stated airflow?
The stated airflow is 43 m³/h. The calculator uses 12 litres per second: 12 L/s = 43.2 m³/h, approximately 43 m³/h.
Why recirculate indoor air instead of drawing air from outdoors?
Fullblack heats the room air already indoors, rather than adding an outdoor-air supply. Supplying outdoor air without balanced extraction can create overpressure, pushing warm, moist indoor air into gaps in the building, where it may cool and condense. Outdoor air also carries microscopic mould spores. They can settle in gaps and germinate on damp surfaces when temperature and moisture conditions allow, leading to mould growth and damage. Recirculating air avoids adding a supply-air flow, but does not replace the building's required ventilation or moisture control.
Can it help with damp conditions?
Adding heat can lower relative humidity while the air is warmer, and regular operation may help reduce conditions that support damp and mould. Recirculation alone does not remove moisture from the building or fix its source. Fullblack does not repair leaks or replace required ventilation or a dedicated dehumidifier.
How is it different from a photovoltaic panel?
A photovoltaic panel converts sunlight into electricity. Fullblack converts sunlight directly into heat. Under the stated comparison conditions, Fullblack can provide up to five times as much useful heat as a photovoltaic panel powering resistance heating.
Is Fullblack just a black metal panel?
No. Fullblack uses a selective super-absorber, not ordinary black-painted sheet metal. Ordinary black paint absorbs sunlight well but also tends to radiate heat strongly towards colder front glass. Fullblack's absorber is only 0.2 mm thick, with 95% solar absorptance and 5% thermal emittance: strong sunlight absorption with limited heat radiation. These percentages describe different wavelength ranges, not the collector's overall efficiency. Its low thermal mass lets it respond immediately when the sun briefly appears and transfer heat to the circulating room air.
What warranty is supplied?
The manufacturer states a 10-year warranty for Fullblack Outdoor. The final webshop will provide the complete warranty terms, exclusions, claim process and proof-of-purchase requirements before checkout.
What should I do during summer or a shutdown?
The super-absorber can become extremely hot in direct sun. Do not leave an exposed collector shut down unless the current manufacturer instructions allow it. Follow the approved summer-operation or covering instructions supplied with the product.
Human support
Real answers.
When you want them.
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