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DAH Solar Brand review

DHN-66Z20/DG(BW)-595W

595 Wp TOPCon Bifacial 80%
ComparePV verdict

Middle of its segment, needs the roof space

Rank 3,905 of 14,005
Compare panels Datasheet PDF
Power (Wp)
595
Strong · top 5%
Efficiency (%)
22.03
Weak · bottom 24%
Density (Wp/m²)
220.3
Weak · bottom 24%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
32.5
Typical · median 31.2 kg
Warranty (yrs)
30
Typical · median 30 yrs

The DAH DHN-66Z20/DG(BW) 585-625W series has been designed to maximize energy yield in spaces where every square meter counts, and to ensure stable performance for years to come. The use of N-type TOPCon cells results in lower degradation and improved energy production at higher temperatures and under less intense sunlight - which is particularly important in Polish conditions during transitional seasons.

The modules utilize a double-glass structure, which enhances mechanical strength and improves the laminate's airtightness, reducing the risk of operational problems in demanding environments. An additional advantage is bifaciality - the panel can utilize reflected light from the ground, which helps to increase energy yield on flat roofs and in ground-mounted installations.

The multi-junction technology that minimizes microcracks also deserves attention, as it allows the module to better withstand loads and thermal cycles. This makes it a sensible choice for PV farms, C&I installations, and large roofs, where durability, predictability, and lower BOS costs are key.

Ranking

1,018 panels in the segment TOPCon 550-600 W
Metric This panel Median Position in segment Overall rank
Module efficiency 22.03% 22.44% Weak · bottom 24% 6,306
Power density 220.3 224.4 Weak · bottom 24% 6,299
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 54.6 53.8 Typical 8,977
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 · 3 caution
Best for

Commercial and utility-scale.

Not ideal for

Roofs where every square metre has to count and tight roof space.

Watch-outs
220.3 watts per square metre

Bottom 24% of the TOPCon 550-600 W segment, against a median of 224.4.

22.03% module efficiency

Bottom 24% of the TOPCon 550-600 W segment, against a median of 22.44%.

What owners get
N-type TOPCon – Reduced LID/LeTID Degradation

N-type TOPCon cells eliminate the Light Induced Degradation characteristic of older P-type PERC technologies. In Polish climatic conditions—with frequent transitional seasons and low solar elevation angles—this translates into meaningfully higher annual energy yield compared to PERC modules of equivalent rated power.

Up to 23.14% Efficiency – Top of the Segment

The highest-tier variant in the series achieves 23.14% module efficiency, matching the Techwise Sun-Pursuit Plus TOPCon (23.14%) and outperforming the Longi Hi-MO 7 (23.1%) and Leapton LP182 (22.36%). Higher efficiency directly reduces module count and BoS costs per MW of installed capacity.

Bifacial Double-Glass Construction

The double-glass design eliminates the backsheet as a component susceptible to UV degradation and moisture ingress, improving laminate integrity and mechanical durability. Bifacial operation enables an additional 5–15% energy gain in ground-mount and flat-roof installations with high-reflectivity surfaces—at a ground albedo of 0.3, this represents several MWh per year for a typical PV plant.

30-Year Linear Power Warranty

The manufacturer provides a 30-year linear power output warranty, confirming stable degradation performance over the full operational lifetime of commercial and utility-scale PV installations. This is the premium TOPCon industry standard, on par with the Longi Hi-MO 7 and superior to the 25-year warranties offered by lower-tier manufacturers.

BNEF Tier 1 – Bankability Confirmed Q4 2025

DAH Solar maintains continuous Tier 1 status per BloombergNEF, including Q4 2025 under tightened criteria (project threshold raised to 10 MW). Tier 1 classification is a prerequisite for project finance and insurance on PV plants above 1 MW.

Trade-offs
Product Warranty Limited to 15 Years

The manufacturer offers only a 15-year product warranty covering materials and workmanship, whereas Longi Solar (Hi-MO 7) and most leading Tier-1 suppliers provide a standard 25-year product warranty. For projects with long financing horizons (15–20 years), this may be a limiting factor in negotiations with lenders or insurers.

Notes from the database
  • At 22.0% efficiency, this panel is on par with typical TOPCon 550-600W modules
  • At 220.3 W/m², this panel generates 4.1 W/m² less per unit area than TOPCon 550-600W median (224.4 W/m²)
  • Temperature coefficient of -0.29%/°C matches the TOPCon 550-600W median
  • Weight of 32.5 kg is 1.3 kg above TOPCon 550-600W median (31.2 kg) - verify structural support
  • Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface

Specifications

Open datasheet PDF
Nominal power (Pmax) 595 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.03 % Weak Segment median 22.44%
Vmpp · Impp 40.10 V · 14.77 A Operating point at max power
Voc · Isc 47.40 V · 15.64 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2382×1134×30 mm · 2.70 m² of roof
Weight 32.5 kg Typical Typical · median 31.2 kg
Cells 132 · 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 15 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 520 W guaranteed
Degradation 1.00 % First year

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 595 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-66Z20/DG(BW)-595W 595 W 22.03% -0.290 32.5 kg You are here
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg +50 W, lighter, +3.0 pp
LR7-60HVH-560M 560 W 24.80% -0.260 25.0 kg -35 W, lighter, +2.8 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg +45 W, lighter, +2.8 pp
LR7-60HVH-555M 555 W 24.60% -0.260 25.0 kg -40 W, lighter, +2.6 pp
AIKO-A635-MAE72Mw 635 W 24.60% -0.260 27.0 kg +40 W, lighter, +2.6 pp
DHN-66Z20/DG(BW)-585W 585 W 21.66% -0.290 32.5 kg -10 W, -0.4 pp
DHN-590Z16/DG(BW) 590 W 21.84% -0.290 32.5 kg Very close match
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +85 W, lighter, +3.2 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +80 W, lighter, +3.0 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +105 W, cooler, +3.0 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +100 W, cooler, +2.9 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +75 W, lighter, +2.8 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg +75 W, lighter, +2.8 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg +75 W, cooler, +2.8 pp

Found 1119 panels of the same or similar size to this one, within ±10 mm. See them here Found 1125 panels of the same or similar size to this one, within ±25 mm. See them here Found 1236 panels of the same or similar size to this one, within ±50 mm. See them here Found 1917 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranties cover the DAH Solar DHN-66Z20/DG(BW) 585–625W panels?
The manufacturer provides a 15-year product warranty against material and workmanship defects, and a 30-year linear power output warranty. Thanks to N-type TOPCon cell technology, the annual degradation rate is lower than that of older P-type modules, meaning the module retains a significantly higher percentage of its nominal power after 30 years. This is one of the longest power output warranties available on the market in this product class.
What is bifaciality and does it genuinely increase energy yield in the DHN-66Z20/DG(BW) series?
Bifaciality means the panel generates electricity from both sides — the front face (direct irradiance) and the rear face (light reflected from the ground, snow, or a light-colored roofing membrane). In ground-mounted installations and flat-roof systems with a white substrate, the bifacial gain typically ranges from 5–15% compared to a monofacial module. On pitched roofs with dark roofing material, the bifacial effect is minimal.
Does the DAH DHN-66Z20/DG(BW) series perform well under Polish weather conditions — overcast skies, frost, and low temperatures?
Yes. N-type TOPCon cells feature a lower temperature coefficient of power and better response to diffuse irradiance than PERC cells. In Polish conditions — where overcast days are prevalent from October through March — this translates into measurably higher energy production during transitional seasons. The dual-glass construction also provides superior resistance to moisture ingress and frost.
What is the efficiency of the DAH Solar DHN-66Z20/DG(BW) modules and how much space does a 10 kWp system require?
Modules in this series achieve efficiency of up to approximately 22.9% (620–625W variant). As a result, a 10 kWp system using 620W panels requires only 16–17 modules and occupies approximately 27–29 m² of roof or ground area. This is a significant advantage in space-constrained installations or where land costs are high.
What types of installations is the DAH DHN-66Z20/DG(BW) 585–625W series best suited for — residential, commercial, or utility-scale PV farms?
Given its large form factor and power output of up to 625W, this series is optimal for utility-scale PV farms, industrial installations, and large commercial rooftops (C&I), where low BoS costs and high yield per module are critical. It can be deployed on a typical single-family residential roof only when the available space and structural load capacity permit — this should be verified with a structural engineer or system designer beforehand.
How does the dual-glass (double glass) construction of the DHN-66Z20/DG(BW) series differ from a standard backsheet?
In a double glass module, the conventional polymer backsheet is replaced by tempered glass, eliminating the risk of laminate cracking, moisture ingress, and backsheet yellowing over decades of operation. This results in higher resistance to snow and wind loads, improved long-term weatherproofing, and extended module service life. For this reason, the double glass variant is particularly recommended for environmentally demanding locations and for installations with a long investment horizon.
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