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EG-665NT66-HU/BF-DG

665 Wp TOPCon Bifacial 100%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 2,833 of 14,005
Compare panels Datasheet PDF
Power (Wp)
665
Typical for its class
Efficiency (%)
21.40
Weak · bottom 8%
Density (Wp/m²)
214.1
Weak · bottom 9%
Temp (%/°C)
-0.300
Typical · median -0.290
Weight (kg)
38.3
Weak · 3.7 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The AURORA Pro series sets a new standard for efficiency through the use of advanced N-Type TOPCon cell technology, which minimizes energy loss and significantly increases module efficiency. This solution effectively eliminates the problem of light-induced degradation, translating into stable power production for decades. These panels are characterized by an excellent temperature coefficient, which means they operate effectively even on hot days when traditional modules lose power. Thanks to its innovative construction, this series offers a higher yield per square meter, which is crucial for investors with limited roof space. AURORA Pro is an ideal choice for demanding residential and commercial installations, where maximizing investment profitability and a short payback period are what matters most. A distinguishing feature of the series is its exceptional resistance to extreme weather conditions and increased efficiency in low light, which in the Polish climate guarantees real profits even on cloudy days. It is an option for those seeking a technological advantage over standard P-Type solutions, ensuring superior system operation and a longer linear performance warranty, which effectively protects the investor's capital for years.

Ranking

249 panels in the segment TOPCon 650-700 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.40% 22.40% Weak · bottom 8% 8,323
Power density 214.1 223.7 Weak · bottom 9% 8,250
Temperature coefficient -0.300 -0.290 Typical 6,093
Weight per kWp 57.6 53.2 Weak · bottom 8% 11,303
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, utility-scale and shaded-installations.

Not ideal for

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

Watch-outs
57.6 kg per kWp

Bottom 8% of the TOPCon 650-700 W segment, against a median of 53.2. Ranked 11,303rd in the whole database.

21.40% module efficiency

Bottom 8% of the TOPCon 650-700 W segment, against a median of 22.40%. Ranked 8,323rd in the whole database.

214.1 watts per square metre

Bottom 9% of the TOPCon 650-700 W segment, against a median of 223.7. Ranked 8,250th in the whole database.

What owners get
N-type TOPCon: Low Temperature Coefficient

The N-type TOPCon cells in the AURORA Pro series exhibit a temperature coefficient of Pmax of -0.31%/°C, a notably better result than typical P-type PERC modules (-0.35 to -0.40%/°C). In practice, this translates to 5–10% higher energy yield on hot summer days when module temperature exceeds 50–60°C.

30-Year Linear Power Warranty ≥87.4%

The manufacturer guarantees degradation of ≤1% in the first year and ≤0.4%/year in subsequent years, resulting in ≥87.4% of nominal power after 30 years. Standard P-type PERC modules from leading suppliers (JA Solar, Trina) typically offer a 25-year warranty with output declining to ~84.8%, making EGing's warranty genuinely more advantageous for investors calculating long-term IRR.

Bifacial Design – Additional Yield from the Rear Side

The bifacial construction enables energy harvesting from light reflected off the ground surface (albedo). With typical ground albedo values of 0.2–0.3 (light gravel, EPDM membrane), the bifacial gain amounts to 5–15% annually, significantly improving LCOE in ground-mount or flat-roof installations without increasing the system's footprint.

Confirmed BNEF Tier-1 Status

EGing PV appears on the official BNEF Tier-1 PV Module Manufacturers list (confirmed at least since Q2 2024), enabling non-recourse project financing for utility-scale solar farms and supporting higher asset valuations upon potential resale. The company has been operating since 2003 and holds a manufacturing capacity of >25 GW per year.

Wide Power Range – 11 Variants (600–685 W)

Eleven power variants spanning 600–685 Wp allow precise string sizing to match inverter requirements (MPP voltage, Isc) across both residential rooftop systems and commercial or utility-scale projects, eliminating the need for additional resistors or power converters.

Trade-offs
Efficiency Below Closest TOPCon Competitors

The series peaks at 22.05% efficiency, while comparable 210 mm TOPCon modules from Solarspace (SS9-66HD) and Seraphim (Sable) reach 22.21% at 690 Wp. The 0.16 percentage-point gap translates to approximately 0.7% lower yield per unit area — a meaningful disadvantage in space-constrained rooftop installations where every cm² contributes to revenue.

Notes from the database
  • Module efficiency of 21.4% is 1.0pp below average for TOPCon 650-700W panels (median: 22.4%)
  • At 214.1 W/m², this panel generates 9.6 W/m² less per unit area than TOPCon 650-700W median (223.7 W/m²)
  • At -0.30%/°C, hot weather performance is typical for TOPCon 650-700W panels
  • Weight of 38.3 kg is 3.7 kg above TOPCon 650-700W median (34.6 kg) - verify structural support
  • Bifaciality factor of 100% can add 5-15% extra yield with reflective mounting surface

Specifications

Open datasheet PDF
Nominal power (Pmax) 665 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.40 % Weak Segment median 22.40%
Vmpp · Impp 38.99 V · 17.06 A Operating point at max power
Voc · Isc 46.78 V · 18.07 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2384×1303×35 mm · 3.11 m² of roof
Weight 38.3 kg Weak Weak · 3.7 kg above median
Cells 132 · TOPCon Monocrystalline
Bifaciality 100 % Rear output as a share of front
Coefficient Pmax -0.300 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.250 · 0.040 %/°C
NOCT 44 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 581 W guaranteed
Degradation 1.00 → 0.40 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by EGing PV in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 665 Wp appear here. The rest cover the 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
-0.300 %/°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
EGing PV EG-665NT66-HU/BF-DG 665 W 21.40% -0.300 38.3 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +3.8 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, lighter, +3.8 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg Cooler, lighter, +3.6 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +3.6 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg Cooler, lighter, +3.6 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg Cooler, lighter, +3.5 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, lighter, +3.4 pp
EG-650M66-HU/BF-DG 650 W 20.92% -0.340 38.3 kg -15 W, hotter, -0.5 pp
EG-655M66-HU/BF-DG 655 W 21.08% -0.340 38.3 kg -10 W, hotter, -0.3 pp
EG-660NT66-HU/BF-DG 660 W 21.24% -0.300 38.3 kg Very close match
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +140 W, cooler, +3.7 pp
AIKO-A800-GRH78Dw 800 W 24.90% -0.260 39.8 kg +135 W, cooler, +3.5 pp
AIKO-A795-GRH78Dw 795 W 24.80% -0.260 39.8 kg +130 W, cooler, +3.4 pp
AIKO-A790-GRH78Dw 790 W 24.60% -0.260 39.8 kg +125 W, cooler, +3.2 pp
TSM-NEG21C.20Q-760 760 W 24.50% -0.260 38.3 kg +95 W, cooler, +3.1 pp
AIKO-A785-GRH78Dw 785 W 24.40% -0.260 39.8 kg +120 W, cooler, +3.0 pp

Found 1390 panels of the same or similar size to this one, within ±10 mm. See them here Found 1400 panels of the same or similar size to this one, within ±25 mm. See them here Found 1400 panels of the same or similar size to this one, within ±50 mm. See them here Found 1432 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty does the EGing PV AURORA Pro panel carry and what does it cover?
EGing PV AURORA Pro panels come with a 12-year product warranty and a 30-year linear power output warranty. This means the manufacturer guarantees that the module will maintain a specified minimum power output level for three decades. EGing PV holds Tier 1 manufacturer status, which reinforces confidence in the enforceability of these warranty commitments and provides genuine protection for the return on investment.
What is TOPCon technology and why does the AURORA Pro series use it?
TOPCon (Tunnel Oxide Passivated Contact) is a next-generation N-Type cell technology that uses a passivation layer to minimize charge carrier recombination. In practice, this translates to module efficiencies of up to 22.05% for the AURORA Pro, a low temperature coefficient of -0.31%/°C, and the effective elimination of Light-Induced Degradation (LID). Compared to the widely used P-Type PERC technology, this means more energy harvested from the same roof area over the entire system lifetime.
Will the EGing PV AURORA Pro 685W panels perform well in the Polish climate with its high number of overcast days?
Yes. The bifacial construction combined with N-Type TOPCon technology gives the AURORA Pro 685W enhanced low-light performance. The rear side of the module captures reflected irradiance even under diffuse radiation conditions, which are typical of Polish autumn and winter. The favorable temperature coefficient of -0.31%/°C also means reduced power losses during summer, when other panels experience significant output degradation during heat waves.
What are the dimensions and weight of the EGing PV AURORA Pro 685W panel, and will it fit on a typical residential roof?
The EGing PV AURORA Pro 685W module measures 2384 × 1303 × 35 mm and weighs 38.3 kg. This is a large-format module (66 cells), typical for commercial installations and larger single-family rooftops. Before purchasing, it is advisable to verify the load-bearing capacity of the roof structure and the availability of compatible mounting hardware, as modules of this size require robust racking systems specifically rated for large-format panels.
What distinguishes the EGing PV AURORA Pro from the standard AURORA series without the Pro designation?
The key difference lies in cell technology: the AURORA Pro series uses N-Type TOPCon cells, while the base AURORA relies on M-Type PERC technology. AURORA Pro achieves higher module efficiency (up to 22.05% vs. approximately 20%), offers a better temperature coefficient, and exhibits no LID. This results in greater annual energy yield and a longer linear power output warranty of 30 years, compared to the standard 25-year warranty on the base series.
Are the AURORA Pro modules bifacial, and when is it worth choosing a bifacial configuration?
Yes, EGing PV AURORA Pro panels are bifacial, meaning they generate electricity from both the front and rear surfaces of the module. The rear side captures light reflected from the ground, rooftop surface, or other nearby surfaces. The additional energy gain typically ranges from 5% to 15%, depending on the albedo of the surface beneath the array and the mounting tilt angle. Bifacial modules are particularly advantageous in ground-mounted installations, on flat roofs with a light-colored membrane, and in agrivoltaic systems.
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