A PVT hybrid panel stacks photovoltaic cells over a heat absorber in a single module: the cells convert sunlight into electricity while the absorber bonded to their rear captures the heat the cells cannot use and transfers it to a circulating fluid. Extracting that heat keeps the cells 10–20 °C cooler, adding roughly 3–8% electrical yield, while delivering usable hot water from the same roof area.
What are the layers inside a PVT panel?
A PVT hybrid collector is a photovoltaic module and a solar thermal absorber built into one frame. From the sun's side downwards, the layers work together as one energy device:
| Layer (top to bottom) | Function |
|---|---|
| Tempered solar glass | Protects the cells and transmits sunlight |
| Encapsulated PV cells | Convert roughly a fifth of the sunlight into electricity |
| Heat-conducting absorber | Draws off the heat the cells reject |
| Fluid channels | Carry the glycol or water that transports the heat |
| Rear insulation or open back (model-dependent) | Biases the panel towards thermal or electrical yield |
| Frame, cabling and hydraulic ports | Standard PV connectors plus flow and return fittings |
Electrically the panel behaves like a normal PV module and wires into a string inverter; hydraulically it behaves like a solar collector and pipes into a closed loop.
How does one panel produce two energy outputs at once?
Crystalline PV cells turn only about 20–22% of incoming sunlight into electricity — the majority of the solar energy becomes heat inside the cell. A plain PV module simply loses that heat to the wind. In a PVT module, the absorber laminated against the cells conducts it into the circulating fluid instead, so a single square metre of roof delivers two simultaneous outputs: DC electricity to the inverter and 25–60 °C heat to a cylinder, a pool or a heat pump source circuit. Neither output interrupts the other; they run in parallel whenever the sun shines.
Why does cooling the PV cells increase electricity output?
Because silicon works better cold. Crystalline cells lose roughly 0.3–0.5% of their output for every degree they warm above the 25 °C rating point, and an uncooled rooftop module routinely runs 30–40 °C above ambient in summer. The heat extraction in a PVT panel keeps the cells 10–20 °C cooler than an equivalent uncooled module, which translates into roughly 3–8% more electricity over the year. The physics is covered in depth in do solar panels produce more electricity when cooled.
Where does the captured heat go?
The thermal side connects like any solar thermal circuit: a pump station circulates the fluid through the panel field and delivers the heat to a coil in a hot water cylinder, a swimming pool heat exchanger, or the source side of a brine/water heat pump. The heat pump configuration — where the panel replaces the outdoor unit or borehole — is the fastest-growing application and is explained in how a PVT panel works as a heat pump source. Typical delivery temperatures by season are covered in what water temperature a PVT panel produces.
How efficient is a PVT panel overall?
Counting both outputs, a PVT panel delivers 3–4 times the total energy of a plain PV module of the same area when the heat is actually used — electricity plus heat can together exceed 60% conversion of the incoming sunlight, against around 20% for PV alone. The technology is established, not experimental: IEA SHC's Solar Heat Worldwide reporting shows well over a million square metres of PVT collectors installed globally, and IEA SHC Task 60 documents monitored systems across Europe. Solimpeks has produced PV-T hybrid panels in Konya since 2008; the current PV-T 590 carries a 590 Wp nominal electrical rating, holds Solar Keymark certification through Kiwa Cermet Italia (licence 16918 Rev.0) and PV module certification to IEC 61215/61730-1 (16917 Rev.0). Whether the combined yield justifies the panel for your building is weighed honestly in are PVT panels better than plain PV.
Frequently asked questions
Does a PVT panel still make electricity if I don't use the heat?
Yes — the PV side works independently, like a normal module. But if the thermal circuit never extracts heat, you lose the cooling benefit and the panel runs at conventional PV temperatures, so the economics depend on having a real heat demand such as hot water, a pool or a heat pump source.
Do PVT panels work on cloudy days?
Yes. The PV cells generate from diffuse light at reduced output, and the absorber still collects low-grade heat. Uncovered PVT panels also exchange heat with the ambient air, which is why they remain useful as a heat pump source even in overcast weather.
Can PVT panels replace both PV modules and solar thermal collectors?
On roofs where space is tight, yes — that is their core advantage: one panel field delivers both outputs from the same area. Where roof space is unlimited, separate PV and thermal can be sized independently; the trade-off is compared in the pvt-vs-separate-pv-and-solar-thermal article.
What electrical output does a modern PVT panel have?
Current-generation PVT modules match mainstream PV ratings. The Solimpeks PV-T 590, for example, has a nominal electrical output of 590 Wp, with the thermal absorber added behind the cells rather than at the expense of electrical capacity.