Welcome to the PRISMA® PVT Knowledge World. Here you will find concise answers to frequently asked questions. Discover content that is clearly presented and helps you to easily and comprehensibly grasp the full potential of hybrid PVT systems.
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Frequently asked questions
Yes, in many cases, using a PVT system is worthwhile – especially when on the
The property requires both electricity and heat. With PRISMA® PVT combine
Photovoltaics and solar thermal in one module, making double efficient use of your roof space.
This allows:
– Heating + hot water off 100% cover
– a significant proportion of the Power consumption generate them yourself,
the Increase self-consumption in conjunction with a heat pump and thus significantly reduce energy costs in the long term.
Another advantage: PRISMA® PVT achieves in the...
Comparison to conventional PV modules higher current yield, especially with
summery temperatures.
Whether a PVT system pays off in your specific case depends, among other things, on the
Roof area, orientationthe Primary energy requirement of the building and the available
Support programmes BAFA and KfW offer various funding programmes that
Significantly reduce acquisition costs.
The yield of a PRISMA® PVT The system depends on several factors – for example, the location, roof pitch, orientation, and system size. Nevertheless, typical values can be stated:
electricity yield:
One PRISMA® PVT-System with e.g. 10 modules (450 W) can annually generate around max in Germany.
4,500 to 5,000 kWh Generate electricity – dependent on solar radiation and roof orientation.
Heat yield:
At the same time Approx. 2,000 to 3,500 kWh thermal energy is generated – ideal for
Domestic hot water preparation with insulated modules or as a renewable source for a heat pump.
Thanks to the active cooling the PV cells Can PRISMA® PVT on an annual average 5–10 % more power
produce than conventional PV systems.
Cooling with PRISMA® PVT This is achieved via an integrated, water-cooled duct system on the rear of the modules. This system absorbs the heat generated by solar radiation and transfers it to the source side of the heat pump or releases it via a heat exchanger to
a buffer tank out.
This so-called Active recooling has two main advantages:
More electricity yield through cool PV cells
Photovoltaic cells lose efficiency when exposed to heat - the warmer they get, the lower their output. Active cooling ensures that the cells work at the optimum temperature. The result: Up to 10 % more electricity yield compared to conventional, uncooled PV modules - especially on hot summer days.
Simultaneous heat utilisation
The heat extracted is not wasted but used purposefully – for example, for hot water preparation, for heating support, or as an efficient energy source for a heat pump. This way, surplus heat is turned into a valuable benefit.
Cooling is therefore a central element of PVT technology: it improves the Electricity production,
increases the Overall efficiency and enables a Dual utilisation of solar energy – on the same
Roof area.
Yes, the PRISMA® PVT Collectors are designed to fit flexibly into existing heating systems can be integrated. It is suitable for both New buildings as well as for the Retrofit in existing buildings.
Typical applications:
Combination with brine heat pumps
The PVT system supplies the heat pump with source energy all year round.
Connection to buffer storage or stratified storage
The heat from the PVT modules can be fed directly into a storage tank and used as needed – for example, for hot water or to supplement heating.
Supplement to existing heating systems
Even in conjunction with gas or pellet heating systems, PRISMA® PVT can contribute as a regenerative heat source to reduce fossil fuels.
The energy distribution for a PRISMA® PVT Installation is carried out in two separate but coordinated systems: for Electricity and for Heat.
1. Electricity distribution (photovoltaic share):
The solar power generated is converted into standard household alternating current via an inverter and then:
- used directly in the household (e.g. for lighting, household appliances, heat pump),
- cached in a power storage device (if available),
– or into fed into the public gridif more is generated than required.
An intelligent energy management system can optimise self-consumption by, for example, specifically activating consumers when there is sunshine.
2. Heat Distribution (Thermal Component):
The heat generated from the modules is utilised via a Water-based pipework system to a Buffer storage tank or Stratified storage in the house. From there, the heat is utilised as follows:
To Hot water preparation (e.g. for shower or kitchen),
– or as Heat source for a heat pump.
A control system ensures that the energy is distributed efficiently and used as required - depending on the time of day, outside temperature and consumption profile.
In short:
The electricity flows into the house's power grid like with any PV system, while the heat is
hydraulically integrated – e.g. in a storage tank, heat pump or heating circuit. Both energy flows
work parallelbut Intelligently coordinated, to make the best use of the energy
PRISMA® PVT Modules are extremely Easy to clean and for a Long-term, low-maintenance operation designed. Both the photovoltaic and the thermal part of the module work reliably for many years - with minimum effort.
What you should know:
Low-maintenance hydraulic system:
The integrated water system is closed, pressure-tested, and made with high-quality materials. With professional installation, it only requires low control.
Long-term security:
The modules are designed for a service life of 25 years and more designed. The function remains even after decades – provided the system is operated in accordance with the manufacturer's specifications
As a rule No manual snow clearance required. The PRISMA® PVT Modules have several properties that a Rapid snowmelt promote:
Why snow usually melts by itself:
Heat dissipation at the module surface:
As the PVT modules not only generate electricity, but also heat, they give off heat even at low levels of solar radiation. heat to the module surface. This significantly accelerates the melting of snow - often even in daylight.
Glass-glass surface with low adhesion:
The smooth, high-quality glass surface ensures that snow sticks less well and slips off more easily – particularly on roof pitches of approximately 20 degrees or more.
Optimised arrangement:
Due to the installation in an inclined position and the heating from the inside to the outside, snow often slides off by itself - much earlier than with conventional PV modules.
When does an eviction make sense?
Only for longer periods of heavy snowfall and persistently low temperatures it can be useful in rare cases to remove snow manually – but only with appropriate aids (e.g. telescopic, soft snow shovels) and without damaging the modules. In most regions of Germany this is not necessaryas the thermal effect of the modules ensures a Automatic defrosting provides.
No, that the PRISMA® PVT The modules work absolutely silently.
No noise on the modules:
There are no active components on the roof - there are Neither whirring fans nor humming motors.
Noise only possible in the plant room (as with any heating system):
Only in the Hydraulic unit or in the area of Heat pump Depending on the system, low flow or pump noises may occur. However, these are at the level of conventional heating systems and are not in the living area.
Especially suitable for quiet residential areas or where there is no space for an outdoor unit of a conventional air source heat pump:
Thanks to its silent function, PRISMA® PVT is also ideal for Detached houses,
Terraced houses or buildings with high Sound insulation requirement.
The economic efficiency of a PRISMA® PVT The system depends on several factors, including your Electricity and heat consumptionthe Size of the systemthe Locationthe Energy pricesthe available Support programmes and how you operate and use the system.
Typical amortisation period:
In many cases, a PRISMA® PVT system already pays for itself after 5 to 8 years – partly also considerably faster if high self-consumption rates are achieved and state funding (e.g. BAFA subsidy) is used.
Why PRISMA® PVT can pay off particularly quickly:
– Dual use of the roof area (electricity + heat)
– Increased self-consumption = lower energy costs
– Higher electricity yield through active cooling
– Independence from rising energy prices
– Eligible through various programmes
– Regeneration of Earth probes
In den meisten Fällen ist keine Baugenehmigung erforderlichwhen the PRISMA® PVT Anlage auf einem pitched roof is installed. Like photovoltaic or solar thermal systems, it is then considered a Project without authorisation according to the respective state building regulations.
What you should bear in mind:
Dachmontage (Standardfall):
Installation on the roof of the house is usually licence-freeas long as there are no listed building or special structural requirements.
Flat roofs, garages, outbuildings:
Auch hier ist meist keine Genehmigung erforderlich – es sei denn, es gelten besondere Auflagen z. B. im Bebauungsplan oder in geschützten Bereichen.
Ground-mounted systems or large commercial projects:
Here you can Building or nature conservation licences be necessary. The same applies to installations on listed buildings.
Mandatory reporting:
Unabhängig von der Genehmigungspflicht muss jede „Strom erzeugende Anlage“ beim Network operator and in the Marktstammdatenregister (MaStR) der Bundesnetzagentur registriert werden. Dies gilt auch für PVT-Anlagen
Ja, in den meisten Fällen wird es sogar so umgesetzt. Glücklicherweise bieten wir von der TWL- Technologie GmbH die optisch gleichen PV-Module zu unseren Prisma PVT Kollektoren an. So ist es nicht nur technisch sinnvoll, sondern auch optisch einheitlich.
Eine PVT-Wärmepumpe nutzt die von PVT-Hybridkollektoren bereitgestellte Umweltenergie zur Beheizung von Gebäuden und zur Hot water preparation. Die Kollektoren gewinnen dabei gleichzeitig elektrische Energie aus Sonnenlicht sowie Wärme aus der Umgebung und der Sonneneinstrahlung.
Die gewonnene Wärme wird über einen geschlossenen Solekreislauf zur Wärmepumpe transportiert. Dort hebt ein thermodynamischer Prozess das Temperaturniveau an, sodass die Energie für Heizung und Warmwasser nutzbar wird.
Im Gegensatz zu klassischen Luft-Wasser-Wärmepumpen ist kein separates Außengerät erforderlich. Die Energieaufnahme erfolgt über die PVT-Kollektoren auf dem Dach, während die Wärmepumpe selbst innerhalb des Gebäudes installiert wird. Dadurch entfallen Ventilatorgeräusche im
Außenbereich, was insbesondere in dicht bebauten Wohngebieten von Vorteil sein kann.
Das bedeutet: Die PVT-Kollektoren liefern Strom und Wärme, die Wärmepumpe macht die gewonnene Umweltenergie für Heizung und Warmwasser nutzbar.
Hier geht es zu unserer Liste mit PVT-Ready Wärmepumpen.
So that a PRISMA® PVT Anlage optimal arbeitet und sicher installiert werden kann, sollte Ihr Dach bestimmte bauliche und technische Voraussetzungen erfüllen.
1. Tragfähigkeit
Das Dach muss die zusätzliche Last der Module (Leergewicht ca. 33kg pro Modul) und der Unterkonstruktion tragen können. Die statische Eignung wird im Vorfeld durch den Installationsbetrieb geprüft. PRISMA® PVT Module sind durch die Glas-Glas-Bauweise und den Absorber schwerer als reine PV-
Modules, bewegen sich aber im üblichen Lastbereich.
2. Ausrichtung & Neigung
Optimal: South-facing with approx. 30-45° inclination
Well suited: South-east or south-west orientation
Auch Ost- oder West- und sogar Nordausrichtungen sind nutzbar, allerdings mit leicht reduziertem Ertrag.
3. Dachfläche
Für ein Standardmodul (ca. 1,76 m × 1,10 m) benötigen Sie je nach geplanter Anlagengröße ausreichend zusammenhängende Fläche. Wir empfehlen ca. 2 Module pro kW-Heizlast.
4. Dachhaut & Zustand
Die Dachdeckung (z. B. Ziegel, Schiefer, Blech) sollte in gutem Zustand sein. Bei älteren Dächern kann es sinnvoll sein, die Dachhaut vor Montage zu erneuern.
Fast jedes solide Einfamilienhausdach kann für eine PRISMA® PVT Anlage genutzt werden – entscheidend ist eine saubere Planung der Gegebenheiten.
Diese Kennzahlen beschreiben die Effizienz von Wärmepumpen. Sie zeigen, wie viel Wärme aus einer eingesetzten Kilowattstunde (kWh) Strom erzeugt werden kann.
COP (Coefficient of Performance)
Der COP-Wert beschreibt die Effizienz einer Wärmepumpe unter festgelegten Prüfbedingungen im Labor. Er dient vor allem zum Vergleich verschiedener Geräte.
SCOP (Seasonal Coefficient of Performance)
Der SCOP betrachtet die Leistung über eine gesamte Heizperiode und berücksichtigt unterschiedliche Außentemperaturen. Dadurch ist er praxisnäher als der COP-Wert.
JAZ (Jahresarbeitszahl)
Die Jahresarbeitszahl gibt an, wie effizient eine Wärmepumpe tatsächlich über ein Jahr hinweg arbeitet. Sie wird anhand realer Betriebsdaten ermittelt und berücksichtigt unter anderem das Heizsystem, die Gebäudeeigenschaften und das Nutzerverhalten.
SJAZ (System-Jahresarbeitszahl)
Die System-Jahresarbeitszahl betrachtet nicht nur die Wärmepumpe selbst, sondern das gesamte Heizsystem. Dazu können beispielsweise Wärmequellen, Pumpen, Speicher, Regelungstechnik oder weitere Systemkomponenten gehören. Die SJAZ liefert daher ein besonders realistisches Bild der Gesamteffizienz einer Anlage.
Grundsätzlich gilt:
Je höher COP, SCOP, JAZ oder SJAZ ausfallen, desto effizienter arbeitet das System und desto weniger
Strom wird für die Bereitstellung von Wärme benötigt.
Mögliche Nachteile:
– Höhere Investitionskosten als eine reine Photovoltaikanlage.
– Noch geringere Marktdurchdringung als klassische PV-Systeme.
– Zusätzliche Komponenten wie Rohrleitungen, Hydraulik oder Speicher können erforderlich sein.
Häufige Mythen:
❌ „PVT funktioniert nur bei Sonnenschein.“
✔️ PVT nutzt neben der Sonneneinstrahlung auch Wärme aus der Umgebung.
❌ „PVT ist laut.“
✔️ PVT-Module arbeiten ohne Ventilator und verursachen keine Betriebsgeräusche auf dem Dach.
❌ „PVT liefert im Winter keine Energie.“
✔️ PVT kann auch bei niedrigen Außentemperaturen Wärme gewinnen.
❌ „PVT benötigt mehr Dachfläche als PV.“
✔️ PVT nutzt die vorhandene Dachfläche doppelt zur Strom- und Wärmegewinnung
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Conclusion
A decision that pays off
A PVT system such as PRISMA® makes optimum use of the existing roof area of your detached house - and reliably supplies electricity and heat from a single source. This not only improves the energy efficiency of your home, but also permanently reduces CO₂ emissions and makes you less dependent on rising energy prices. The technology is manufactured in Germany, designed for durability and comes with a 25-year performance guarantee on the PV. In combination with a heat pump, storage system and state subsidy, the result is a well-thought-out solution - for greater self-sufficiency, greater cost-effectiveness and greater security for the future.
Please note!
As a manufacturer/wholesaler, we only supply the specialised trade and craftsmen.
If you are a private customer and would like a quote, please send your request for a quote to your local installer.
However, we are happy to offer you as a private customer an initial consultation or information by e-mail.
