Put into the light with :: SOLDEC PHOTOVOLTAIC What are you doing if the costs for heat generation or cooling go to the sky? The
solution: the world innovation
SOLDEC RONDO with electricity, heat, insulation and

SOLDEC RONDO is a solar multifunctional roof
Your Advantage
with optimal usage of the daylight.
SOLDEC RONDO looks like a round glass lid on
the roof, on which a photovoltaic plant is set on.

:: additional building heating
The appliance tips toward the sun to use the light-
or warmthenergy optimally.

:: generation of electricity, primal energy
saving to approximately 13642 kWh per year

of electricity and other raw material

SOLDEC can be used as well in trade and Industry
as in private houses.
:: best heat insulation
:: modular built system, therefore

Studies and awards
Report to the energetically and light technolo-
gically effectiveness through the Solar Institute

Jülich, drawn up by Prof. Dr. Klemens Schwarzer
and Dr. rer. nat. Joachim Göttsche.

The trial plant SOLDEC LINEA was tested in a
four-year trial operation on a passive house near
Augsburg and gained an Innovation Award in the
year 2004.

Convenient in summer
In summer the photovoltaic lid opens towards the
sun to win heat energy and produce electricity, but

Robert & Thomas Wittmann
protects the window against too much solar heat and
Consulting Service, constructional engineering
so avoids the heating-up of the interior room.
Gersthofer Straße 9
D-86368 Hirblingen

Light falls indirectly via the mirror at the back side of
the damper through the window.
How do you react, if you want to use daylight, but without the disadvantages like
heat loss or excessive heating? The answer: the world innovation
with electricity, heat and shadowing.
Economical at every season
roofs, can as a roof light be set in as well for daylight
technology as also for building heating.

In summer the Soldec Rondo turns over the
With a light power of more than 400 bulbs (à 100W)
course of the day always together with the sun
and the heat output of 6 kW this product is an unbe-
that the glass panels were shadowed – that
means generation of electricity and protection
roof buildings.
against the sun in one!
Additionally the lid on the glass panels closes
SOLDEC RONDO enables a primal energy saving
after sundown and protects against thunderstorm
of just under 13642 kWh, because it is usable as a
and noise.
Heliostat, photovoltaic plant, glass roof and insu-
lation element. By the use of the up side mounted
2-axial controllable mirror the sun shines the whole

the building as possible.

day through – always exactly from top.
After sundown the lid on the glass panel closes
like the door of a freezer and keeps the heat ener-
gy inside.

For comparison
A SOLDEC RONDO with the diameter of 2.80m
replaces 14 to 16 roof light domes of 1.20m x
1.20m (both systems: 6m² glass area).

daylight, you would need 400 bulbs for it à100W,

that is 40kW.
Costs / Charges
Depending on the execution between 5500 € for
the introduction version up to 28 000 € as the ideal

Convenient in winter
In winter the heliostat lid opens toward the sun, to

the building.
Robert & Thomas Wittmann
A heat output of about 6kW, achieved from direct
Consulting Service, Constructional Engineering
and diffuse radiation, kept the inside temperature of
Gersthofer Straße 9
an experimental building at 20 degrees below zero
D-86368 Hirblingen
outside temperature without additional heating at 23
degrees above zero.


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