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Viessmann P255PGHC
Viessmann Brand review

P255PGHC

255 Wp Polycrystalline
ComparePV verdict

Middle of its segment, weak in heat

Rank 13,711 of 14,005
Compare panels Datasheet PDF
Power (Wp)
255
Weak · bottom 23%
Efficiency (%)
15.70
Weak · bottom 17%
Density (Wp/m²)
156.7
Weak · bottom 17%
Temp (%/°C)
-0.420
Weak · bottom 9%
Weight (kg)
18.5
Weak · bottom 21%
Warranty (yrs)
25
Typical · median 25 yrs

Vitovolt 300 is an advanced line of photovoltaic modules that combines high efficiency with exceptional durability, meeting the needs of investors seeking full energy security. This series utilizes innovative shingled cell technology, which eliminates gaps between cells, increasing the active surface area and performance in difficult lighting conditions. Thanks to this solution, the panels handle shading much better than standard products, maintaining high electricity production even when the module surface is partially covered. These products solve the problem of power degradation over time, offering a 25-year performance warranty and excellent resistance to aggressive external factors, such as ammonia or salt spray. It is an ideal choice for modern farms, single-family homes, and buildings in demanding coastal areas. Compared to the competition, Vitovolt 300 stands out with high mechanical strength of 6000 Pa, which guarantees structural stability even during extreme snowfall. The series provides an elegant design with a black frame, which harmoniously blends with any roof architecture. It is a complete system for those who value European engineering standards, offering positive power tolerance, which translates into real yields above nominal values and a faster return on investment in the variable Polish climate.

Ranking

966 panels in the 155-355 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 15.70% 17.52% Weak · bottom 17% 13,685
Power density 156.7 175.2 Weak · bottom 17% 13,676
Temperature coefficient -0.420 -0.360 Weak · bottom 9% 13,796
Weight per kWp 72.5 64.7 Weak · bottom 21% 13,520
Performance warranty 25 yrs 25 yrs Typical 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 3 caution
Best for

Residential, shaded-installations and cold-climate.

Not ideal for

Hot climates, tight roof space and roofs where every square metre has to count.

Watch-outs
-0.420 %/°C temperature coefficient

Bottom 9% of the 155-355 W band, against a median of -0.360. Ranked 13,796th in the whole database.

15.70% module efficiency

Bottom 17% of the 155-355 W band, against a median of 17.52%.

156.7 watts per square metre

Bottom 17% of the 155-355 W band, against a median of 175.2.

Notes from the database
  • At 15.7% efficiency, this panel is 6.1pp below the database median of 21.8%
  • At 156.7 W/m², this panel generates 61.4 W/m² less per unit area than database median (218.1 W/m²)
  • Temperature coefficient of -0.42%/°C is 0.12pp worse than database median (-0.30%/°C) - higher losses in summer heat
  • Weight of 18.5 kg (8.0 kg below database median of 26.5 kg) allows easier transport and roof mounting
  • Ranked #13685 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 255 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 15.70 % Weak Segment median 17.52%
Vmpp · Impp 30.64 V · 8.32 A Operating point at max power
Voc · Isc 37.50 V · 8.76 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1640×992×40 mm · 1.63 m² of roof
Weight 18.5 kg Weak Weak · bottom 21%
Cells 60 Polycrystalline
Coefficient Pmax -0.420 %/°C Weak bottom 9% of its segment
Coefficient Voc · Isc -0.310 · 0.046 %/°C
NOCT 44 °C At 800 W/m², 20 °C ambient
Product warranty 10 years Hardware defects only
Performance warranty 25 years Typical median 25 yrs · median 25 yrs
End-of-warranty output 80.0 % Equals 195 W guaranteed
Degradation 3.00 → 0.71 % First year, then annual

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.420 %/°C against a segment median of -0.360
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Viessmann P255PGHC 255 W 15.70% -0.420 18.5 kg You are here
CS3K-305P-AG 305 W 18.40% -0.360 22.5 kg +50 W, cooler, +2.7 pp
RL305HP-120 305 W 18.30% -0.390 18.5 kg +50 W, cooler, +2.6 pp
WS-295 295 W 18.17% -0.386 18.5 kg +40 W, cooler, +2.5 pp
CS3K-305PB-AG 305 W 18.10% -0.360 22.3 kg +50 W, cooler, +2.4 pp
CS3K-300P-AG 300 W 18.10% -0.360 22.5 kg Cooler, +2.4 pp, +5 yr warranty
RL300HP-120 300 W 18.05% -0.390 18.5 kg +45 W, cooler, +2.4 pp
LNSK-305P 305 W 18.01% -0.360 21.0 kg +50 W, cooler, +2.3 pp
MYP3060-300 300 W 18.01% -0.370 19.0 kg +45 W, cooler, +2.3 pp
P260PGHC 260 W 16.00% -0.420 18.5 kg +0.3 pp
P265PGHC 265 W 16.30% -0.420 18.5 kg +10 W, +0.6 pp
SPR-MAX3-400-COM 400 W 22.60% -0.270 19.0 kg Cooler, +6.9 pp, +15 yr warranty
LEPV 400 400 W 22.31% -0.290 20.0 kg +145 W, cooler, +6.6 pp
NS-360MH-60 360 W 22.12% -0.290 17.0 kg +105 W, cooler, +6.4 pp
NS-360MH-60 360 W 22.12% -0.290 17.0 kg +105 W, cooler, +6.4 pp
SPR-MAX3-390-COM 390 W 22.10% -0.270 19.0 kg Cooler, +6.4 pp, +15 yr warranty
MB_TG120ByB_390 390 W 21.80% -0.259 24.4 kg +135 W, cooler, +6.1 pp

Found 182 panels of the same or similar size to this one, within ±10 mm. See them here Found 218 panels of the same or similar size to this one, within ±25 mm. See them here Found 379 panels of the same or similar size to this one, within ±50 mm. See them here Found 472 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What is shingled cell technology used in Vitovolt 300 and is it worth choosing?
Shingled technology connects strips of PERC cells with no gaps between them, increasing the module's active surface area and reducing losses at cell junctions. In practice, the panel handles partial shading - from a chimney or antenna, for example - better than modules with conventional cell layouts, maintaining higher power output. It also gives the surface a more uniform look, without visible busbar grids.
What warranty comes with Viessmann Vitovolt 300 modules?
Vitovolt 300 comes with a 15-year product warranty covering material and workmanship defects, plus a 25-year linear power warranty guaranteeing a minimum performance level over the module's service life. This warranty structure gives investors confidence that the installation will keep producing at a high level throughout the typical loan repayment or depreciation period used in most Polish PV subsidy programs.
Are Vitovolt 300 panels suitable for a farm building roof or a coastal location?
Yes, Vitovolt 300 modules are tested for resistance to ammonia and salt mist, making them a solid choice for farm buildings (barns, poultry houses) and structures near the sea, where standard panels can corrode faster. The black frame and clean design also blend well with both agricultural roofs and single-family homes in more demanding environmental conditions.
What is the maximum power output of Vitovolt 300 panels, and how many are needed for a 5 kWp system?
Vitovolt 300 modules reach a maximum power output of up to 405 Wp. For a residential 5 kWp system, that means roughly 12-13 panels, depending on the exact inverter configuration and available roof space. Thanks to the positive power tolerance, individual modules often slightly exceed their rated output in practice, resulting in somewhat higher yields than theoretical calculations alone would suggest.
Can Vitovolt 300 panels handle heavy snow loads and strong wind?
Yes, the series offers high mechanical load resistance of up to 6000 Pa, well above typical requirements for the Polish climate. This construction allows the panels to safely handle heavy snow accumulation on the roof as well as strong wind gusts, without risk of glass cracking or frame deformation - a key advantage for buildings in regions with variable weather.
Are Viessmann Vitovolt 300 panels bifacial?
No, Vitovolt 300 modules are mono-facial, using shingled PERC cells enclosed in a conventional, non-transparent backsheet structure. This means they generate power only from light hitting the front side of the panel, unlike bifacial modules that also capture light reflected off the ground. For typical sloped roofs, this is a fully sufficient and more cost-effective solution.
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