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DAH Solar DHN-48Z20/DG-425W
DAH Solar Brand review

DHN-48Z20/DG-425W

425 Wp TOPCon Bifacial 80%
ComparePV verdict

Middle of its segment, modest efficiency

Rank 8,711 of 14,005
Compare panels Datasheet PDF
Power (Wp)
425
Typical for its class
Efficiency (%)
21.27
Weak · bottom 10%
Density (Wp/m²)
212.7
Weak · bottom 13%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
23.9
Weak · 1.9 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The DAH DHN-48Z20/DG (425-455W) series are glass-glass type modules designed for stable energy production over many seasons, even in less ideal mounting conditions. The use of N-type TOPCon technology helps to minimize typical power losses over time and improves performance under weaker sunlight, which is important in the Polish climate. The bifacial design further allows for the utilization of reflected light from the ground - a real advantage on roofs with light membranes, carports, and ground-mounted installations.

The double-glass construction also increases resistance to moisture, stress, and material degradation over the long term. In practice, this means a lower risk of microcracks, greater predictability in performance, and more reliable operation. The series also features long, linear power warranty, making it easier to plan the profitability of the investment.

This is a good choice for homes, businesses, and PV farms where durability, consistent performance, and high module reliability are important.

Ranking

1,218 panels in the segment TOPCon 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.27% 22.00% Weak · bottom 10% 8,849
Power density 212.7 220.2 Weak · bottom 13% 8,733
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 56.2 51.4 Weak · bottom 21% 10,505
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 4 caution
Best for

Residential and commercial.

Not ideal for

Tight roof space, roofs where every square metre has to count and weight-limited structures.

Watch-outs
21.27% module efficiency

Bottom 10% of the TOPCon 400-450 W segment, against a median of 22.00%.

212.7 watts per square metre

Bottom 13% of the TOPCon 400-450 W segment, against a median of 220.2.

56.2 kg per kWp

Bottom 21% of the TOPCon 400-450 W segment, against a median of 51.4.

What owners get
N-type TOPCon – Degradation ≤0.4%/year

The datasheet confirms 1% degradation in the first year and ≤0.4%/year linear degradation in subsequent years. This represents approximately 20–25% slower power loss than typical PERC modules (0.5–0.55%/year), which over a 30-year horizon translates into several percentage points of higher cumulative energy yield.

30-Year Linear Power Warranty

The manufacturer guarantees power output for 30 years — five years longer than the standard 25-year warranty offered by comparable products such as the Waaree ARKA SERIES in the same power class. The extended warranty simplifies project bankability assessments and LCOE calculations for commercial installations and utility-scale PV farms.

Efficiency Up to 22.77% – Among Segment Leaders

The top variant in the series achieves 22.77%, placing it virtually on par with leading competitors in its class: Sunlike Solar SKT420–455M10-108D6 (22.8%) and IBC Solar LS-TA2 (22.8%), and significantly above the Waaree ARKA (20.93%). High module efficiency is particularly critical where rooftop area is constrained.

Bifacial Glass-Glass – Durability and Additional Yield

The dual-glass construction eliminates the risk of moisture ingress through the backsheet and reduces PID degradation. For ground-mounted systems and carports with light-colored surfaces, the bifacial effect can increase annual energy yield by 5–15% compared to monofacial modules, with no additional hardware cost.

DAH Solar BNEF Tier 1 (Confirmed Q1–Q3 2025)

DAH Solar has appeared continuously on the BNEF Tier 1 list since at least Q1 2025, confirming the manufacturer's financial stability and facilitating project financing from lending institutions. Founded in 2009, the company brings over 15 years of manufacturing experience.

Trade-offs
Higher Weight – Glass-Glass vs. Glass-Backsheet

Glass-glass modules typically weigh 25–28 kg, approximately 20–25% more than their glass-backsheet counterparts (21–23 kg). For retrofits on older rooftops, a structural assessment of the load-bearing construction may be required, adding cost and extending the project timeline.

Notes from the database
  • At 21.3% efficiency, this panel is 0.7pp below the TOPCon 400-450W median of 22.0%
  • Power density of 212.7 W/m² is 7.5 W/m² below TOPCon 400-450W median (220.2 W/m²) - needs more roof space
  • At -0.29%/°C, hot weather performance is typical for TOPCon 400-450W panels
  • At 23.9 kg, this panel is 1.9 kg heavier than the TOPCon 400-450W median (22.0 kg) - more demanding for installation crews
  • Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof

Specifications

Open datasheet PDF
Nominal power (Pmax) 425 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.27 % Weak Segment median 22.00%
Vmpp · Impp 29.60 V · 14.36 A Operating point at max power
Voc · Isc 35.00 V · 15.34 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1762×1134×30 mm · 2.00 m² of roof
Weight 23.9 kg Weak Weak · 1.9 kg above median
Cells 96 · TOPCon Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.290 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.250 · 0.046 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 25 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 371 W guaranteed

Datasheet charts

Open datasheet PDF

Measured curves published by DAH Solar in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 425 Wp appear here. The rest cover the whole series.

30-Year Linear Power Output Warranty 30-Year Linear Power Output Warranty Whole series

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
-
With bifacial gain
-

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

Heat losses
-0.290 %/°C against a segment median of -0.290
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Filter these
Size
Panel Power Eff. Temp. Weight Difference
DAH Solar DHN-48Z20/DG-425W 425 W 21.27% -0.290 23.9 kg You are here
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg +50 W, +2.7 pp, +10 yr warranty
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg +40 W, lighter, +2.5 pp
JAT54S40-475/LR 475 W 23.80% -0.260 19.3 kg +50 W, lighter, +2.5 pp
TWMNH-48HW475 475 W 23.80% -0.280 23.7 kg +50 W, +2.5 pp
CHSM48RN(DG)/F-BH-475 475 W 23.80% -0.290 24.5 kg +50 W, +2.5 pp
AIKO-A475-MCE54Mw 475 W 23.80% -0.260 21.0 kg +50 W, cooler, +2.5 pp
AIKO-A475-MAH54Mw 475 W 23.80% -0.260 21.5 kg +50 W, cooler, +2.5 pp
DHN-48Z16/DG(RR)-380W 380 W 19.02% -0.290 23.9 kg -45 W, -2.2 pp
DHN-48Z16/DG(RR)-385W 385 W 19.27% -0.290 23.9 kg -40 W, -2.0 pp
DHN-48Z16/DG(RR)-390W 390 W 19.52% -0.290 23.9 kg -35 W, -1.8 pp
DHN-48Z16/DG(RR)-395W 395 W 19.77% -0.290 23.9 kg -30 W, -1.5 pp
DHN-48Z16/DG(RR)-400W 400 W 20.02% -0.290 23.9 kg -25 W, -1.2 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +85 W, cooler, +3.7 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +70 W, cooler, +3.5 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +80 W, cooler, +3.4 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +65 W, cooler, +3.2 pp

Found 1395 panels of the same or similar size to this one, within ±10 mm. See them here Found 1425 panels of the same or similar size to this one, within ±25 mm. See them here Found 3614 panels of the same or similar size to this one, within ±50 mm. See them here Found 3962 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty does the DAH Solar DHN-48Z20/DG series carry and what does it cover?
The DHN-48Z20/DG series comes with a 25-year product warranty covering material and workmanship defects, along with an industry-leading 30-year linear power output warranty. In practice, this means the manufacturer guarantees predictable, minimal performance degradation over three decades — making it significantly easier to calculate investment returns and negotiate financing terms.
Are the DAH Solar DHN-48Z20/DG (455W) modules suitable for pitched roof installation in Poland?
Yes, the DHN-48Z20/DG series is well suited for typical pitched roof installations. The bifacial glass-glass construction increases module rigidity and resistance to mechanical stress, while the N-type TOPCon cell technology improves energy yield under low-irradiance and diffuse light conditions — common during autumn and winter months in Poland. It is advisable to verify roof load-bearing capacity, as the dual-glass design adds slightly more weight compared to standard framed modules with a backsheet.
What are the advantages of bifacial technology in the DHN-48Z20/DG series and when does it genuinely pay off?
Bifacial cells allow modules to harvest light reflected from the ground surface through the rear side of the panel. Real-world bifacial gains typically range from 5–15% in additional energy yield and are highest when modules are installed over a light-colored roofing membrane, white gravel, or concrete in ground-mount systems, as well as on carports with open space beneath the array. On a dark roof with negligible albedo, the bifacial effect is minimal.
How does the TOPCon technology used in the DHN-48Z20/DG differ from older PERC cells?
N-type TOPCon cells feature a lower annual degradation rate (approximately 0.4% vs. 0.55% for PERC), perform better at elevated temperatures, and maintain higher output under low-light conditions. In the DHN-48Z20/DG series, this translates into higher cumulative energy yield over the module's entire service life, as well as a significantly reduced risk of LID (Light Induced Degradation) — the initial power loss that occurs upon first exposure to sunlight.
Does the glass-glass construction of the DAH Solar DHN-48Z20/DG series increase module durability?
Yes, replacing the conventional backsheet with a second glass pane substantially reduces moisture ingress into the laminate, thereby lowering the risk of delamination, cell corrosion, and microcracks over the long term. Glass-glass modules are recommended wherever panels are subject to significant temperature cycling, high humidity, or chemically aggressive environments — such as coastal installations or sites near industrial facilities.
Is DAH Solar a reliable manufacturer and does the DHN-48Z20/DG series hold the necessary certifications?
DAH Solar is classified as a Tier 1 manufacturer according to industry rankings (Bloomberg NEF), confirming its financial stability and consistent production quality. The DHN-48Z20/DG series modules carry IEC 61215 and IEC 61730 certifications, which are required for the legal sale and installation of PV modules within the European Union. This is particularly important when applying for subsidies under programs such as the Polish Mój Prąd scheme.
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