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DAH Solar Brand review

DHN-60R20/DG-495W

495 Wp TOPCon Bifacial 80%
ComparePV verdict

Middle of its segment, needs the roof space

Rank 5,387 of 14,005
Compare panels Datasheet PDF
Power (Wp)
495
Strong · top 4%
Efficiency (%)
21.89
Weak · bottom 13%
Density (Wp/m²)
218.9
Weak · bottom 13%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
27.0
Weak · 3.0 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The DAH DHN-60R20/DG 495-520W (Double Glass) series is designed for maximum operational stability in real-world installation conditions - where resistance to mechanical loads, moisture, and accelerated material aging are crucial. The use of a double glass construction minimizes the risk of degradation over time, which will be appreciated by investors who prioritize predictable energy yield and lower maintenance costs.

These are bifacial modules that can also utilize reflected light from the ground, making them particularly well-suited for bright roofs, ground-mounted installations, and applications with high energy production requirements. The N-TOPCon cell technology helps maintain high efficiency and stable performance over time, while the low temperature coefficient improves performance on hot days - which is important in densely packed roof installations.

This series is a good choice for homes, businesses, and PV farms where durability, a longer lifespan, and a real return on investment per square meter are priorities.

Ranking

1,089 panels in the segment TOPCon 450-500 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.89% 22.52% Weak · bottom 13% 6,882
Power density 218.9 225.2 Weak · bottom 13% 6,793
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 54.5 52.2 Weak · bottom 21% 8,872
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, commercial and hot-climate.

Not ideal for

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

Watch-outs
218.9 watts per square metre

Bottom 13% of the TOPCon 450-500 W segment, against a median of 225.2.

21.89% module efficiency

Bottom 13% of the TOPCon 450-500 W segment, against a median of 22.52%.

54.5 kg per kWp

Bottom 21% of the TOPCon 450-500 W segment, against a median of 52.2.

What owners get
Confirmed BNEF Tier 1 Status Throughout 2025

DAH Solar maintained its position on the BNEF Tier 1 list continuously from Q1 through Q4 2025, directly supporting project bankability and access to financing. This is a compelling credential for commercial investors and utility-scale PV projects subject to rigorous due diligence.

~85% Bifaciality — Real-World Yield Gain of +5–25%

The rated bifaciality of ~85% enables the module to harvest energy from irradiance reflected off the mounting surface. Under typical installation conditions (light-colored rooftop, ground mount, snow cover), this translates to a 5–25% higher annual energy yield compared to equivalent monofacial modules.

Double Glass Construction — No EVA Backsheet Degradation

Replacing the polymer backsheet with a glass rear layer eliminates the primary moisture ingress pathway responsible for delamination and PID degradation. Over a 30-year service life, this means lower risk of hidden power losses and reduced O&M costs compared to single-glass modules.

N-type TOPCon: Temperature Coefficient Pmax ≈ –0.29%/°C

N-type TOPCon cells exhibit a Pmax temperature coefficient of approximately –0.29%/°C (confirmed for the closely related DHN-54R20-DG series), significantly better than the typical –0.34%/°C for PERC. At a cell temperature of 70°C, the difference amounts to roughly 1.5 percentage points of yield — a meaningful advantage in dense rooftop installations during summer.

30-Year Linear Power Warranty (≥87% Pmax)

The manufacturer offers a 30-year power output warranty with a floor of ≥87% of rated Pmax at year 30 — five years longer than the peer comparable Silfab Commercial NTC (standard 25-year warranty). The extended financial horizon improves installation NPV in DCF modeling.

Trade-offs
Efficiency Up to 23% — Below Segment Leaders

The series peaks at 23.0% efficiency, while peer comparables HT-SAAE HT54-18X(N) and TCL HSM-BD60 reach 23.8% and 23.5%, respectively, at the same 520 Wp power class. On an identical roof area (~30 m²), the HT-SAAE module is estimated to produce approximately 3.5% more energy annually — a difference that can amount to several hundred kWh over a 10-year horizon.

Notes from the database
  • Efficiency of 21.9% is 0.6pp below the TOPCon 450-500W median (22.5%)
  • 218.9 W/m² power density is 6.3 W/m² below TOPCon 450-500W median (225.2 W/m²) - requires larger installation area
  • Temperature coefficient of -0.29%/°C matches the TOPCon 450-500W median
  • At 27.0 kg (3.0 kg above TOPCon 450-500W median of 24.0 kg), requires checking roof load capacity
  • 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces

Specifications

Open datasheet PDF
Nominal power (Pmax) 495 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.89 % Weak Segment median 22.52%
Vmpp · Impp 36.90 V · 13.41 A Operating point at max power
Voc · Isc 43.50 V · 14.42 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1994×1134×30 mm · 2.26 m² of roof
Weight 27.0 kg Weak Weak · 3.0 kg above median
Cells 120 · 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 433 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 495 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-60R20/DG-495W 495 W 21.89% -0.290 27.0 kg You are here
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg Cooler, lighter, +3.1 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg Cooler, lighter, +2.9 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg Cooler, lighter, +2.8 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg Cooler, lighter, +2.6 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg Cooler, lighter, +2.6 pp
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg Cooler, lighter, +2.6 pp
DHN-60R18/DG-500 500 W 22.11% -0.290 27.0 kg +0.2 pp
LR7-60HVH-560M 560 W 24.80% -0.260 25.0 kg +65 W, cooler, +2.9 pp
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg +60 W, cooler, +2.7 pp
LR7-60HVHL-550M 550 W 24.40% -0.260 16.3 kg +55 W, lighter, +2.5 pp
JAT60S40-540/LR 540 W 24.40% -0.260 23.5 kg +45 W, lighter, +2.5 pp
GK-5-60HG-540M 540 W 24.40% -0.260 23.3 kg +45 W, lighter, +2.5 pp
JKM545-54QL6-DV-F1-EU 545 W 24.27% -0.260 27.5 kg +50 W, cooler, +2.4 pp
LR7-60HVH-545M 545 W 24.20% -0.260 25.0 kg +50 W, cooler, +2.3 pp

Found 81 panels of the same or similar size to this one, within ±10 mm. See them here Found 94 panels of the same or similar size to this one, within ±25 mm. See them here Found 588 panels of the same or similar size to this one, within ±50 mm. See them here Found 1900 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty coverage applies to DAH Solar DHN-60R20/DG panels?
The DHN-60R20/DG series carries a 25-year product warranty covering material and workmanship defects, along with a 30-year linear power output warranty. After 25 years the module is guaranteed to retain at least 89.4% of its nominal power, and after 30 years at least 87.4%. DAH Solar is listed as a Tier 1 manufacturer, which indicates financial stability and the practical enforceability of warranty claims.
What does TOPCon technology mean in the DAH DHN-60R20/DG panels, and is it genuinely superior to PERC?
TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology that minimizes electron recombination losses at the cell contacts. In practice this translates to higher efficiency — the DHN-60R20/DG series reaches up to 23% — and a lower temperature coefficient (-0.29%/°C), meaning the module loses less power during hot weather than a typical PERC module. N-type cells also exhibit slower long-term degradation rates compared to conventional P-type PERC technology.
Will the bifacial version of the DAH DHN-60R20/DG perform well on a typical pitched roof in Poland?
Yes, although the bifacial gain — additional yield from light reflected off the underlying surface — is lower on a pitched roof than in a ground-mounted system. On a light or light-gray roofing substrate, a few percent of additional rear-side generation can reasonably be expected. With dark roof tiles the gain will be minimal. The module weighs approximately 27 kg and measures 1994 × 1134 × 30 mm, which is standard for residential and commercial rooftop installations.
Which installation types are best suited for the DAH DHN-60R20/DG 520 W series?
The series has been engineered for three categories of installation: residential homes and farm buildings, where long-term durability and low failure rates over decades are the primary requirements; commercial facilities and warehouses with large roof surfaces, where the high unit power of 520 W reduces the total module count and associated BoS costs; and ground-mounted utility-scale PV plants, where the bifacial double-glass construction maximizes annual energy yield by harvesting reflected irradiance from both sides of the module.
How does the double-glass construction of the DHN-60R20/DG series differ from standard backsheet modules?
In double-glass modules the conventional polymer backsheet is replaced by a second pane of glass (2 mm thick). This construction provides superior resistance to moisture ingress, UV radiation, and mechanical damage — particularly important for ground-mounted installations and harsh climatic environments. It also extends the realistic operational lifetime of the module and reduces the risk of PID (Potential-Induced Degradation). The primary trade-off is a slightly higher module weight of approximately 27 kg.
Do DAH Solar DHN-60R20/DG panels perform well in winter and under overcast conditions?
Yes. N-type TOPCon cells exhibit better spectral response to diffuse irradiance than older PERC technology, which results in higher energy yield on overcast days — a common condition during Polish autumn and winter. The low temperature coefficient (-0.29%/°C) is equally relevant in summer: the hotter the ambient temperature, the smaller the power loss compared to modules with a higher (more negative) temperature coefficient, contributing to improved overall LCOE across the full annual operating cycle.
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