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DMEGC DM645M10T-B78HSW
DMEGC Brand review

DM645M10T-B78HSW

645 Wp TOPCon Bifacial 80%
ComparePV verdict

Solid all-round for its segment

Rank 1,491 of 14,005
Compare panels Datasheet PDF
Power (Wp)
645
Strong · top 3%
Efficiency (%)
23.10
Typical · median 22.80%
Density (Wp/m²)
230.7
Typical · median 227.7
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
33.5
Typical · median 32.7 kg
Warranty (yrs)
30
Typical · median 30 yrs

The DMEGC DMxXXM10T-B78HSW series are bifacial modules in a bi-glass configuration, designed for installations where real energy gain matters as much as catalog parameters. The application of N-type monocrystalline TOPCon technology helps maintain high performance over time and minimizes typical losses found in older designs. Thanks to the dual-glass structure, the modules are better prepared for challenging environmental conditions-from humidity and ammonia to wider temperature fluctuations, which is especially important for projects deployed for years. Another key advantage is bifaciality, which allows using reflected light from the ground, increasing energy production in PV farms, ground-mounted systems, and bright commercial rooftops. The series focuses on high mechanical durability and operational stability, translating to lower warranty claim risks and a more predictable energy cost over the entire lifecycle. This makes it an excellent choice for C&I and utility investors aiming to maximize yield on limited surfaces and enhance project profitability.

Ranking

1,086 panels in the segment TOPCon 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 23.10% 22.80% Typical 1,570
Power density 230.7 227.7 Typical 1,654
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 51.9 53.1 Typical 5,361
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 · 2 caution
Best for

Commercial and utility-scale.

What owners get
23.3% Efficiency – Among the Top Performers in Its Class

A peak efficiency of 23.3% places the series on par with the Astronergy ASTRO N5 (23.3%) and above the BYD AURO N NLBK-39 (23.25%). For C&I installations with limited roof or ground space, this directly translates to higher kWh/m² yield without increasing the system footprint.

Low Temperature Coefficient of -0.29%/°C

N-type TOPCon cells exhibit a significantly lower power loss at elevated temperatures than typical PERC modules (-0.35 to -0.37%/°C). Under Polish summer conditions (module temperature 50–65°C), this difference realistically results in 3–5% higher seasonal energy output compared to older technologies.

30-Year Linear Power Warranty at ≥87.4%

The manufacturer guarantees ≥99% of rated power in year 1, followed by a maximum degradation rate of 0.4%/year, with a minimum floor of 87.4% after 30 years. This specification is comparable to Jinko Tiger Neo and Astronergy and minimizes investment risk in non-recourse-financed utility-scale projects.

Bankability: Tier 1 BNEF, S&P Global, Top 5 Globally

DMEGC maintained Tier 1 status in the BloombergNEF Q3 2025 ranking and achieved Tier 1 classification from S&P Global. Wood Mackenzie's 2025 ranking placed DMEGC 5th among global module manufacturers (H1 2025 shipments: 13.4 GW, +64% YoY), ensuring lender acceptance in project finance transactions.

Bi-Glass Construction with 80% Bifaciality (φPmax 80±5%)

The glass-glass encapsulation provides resistance to moisture, ammonia, and thermal cycling — critical for agri-PV and ground-mounted installations. An 80% bifaciality factor is the premium-class standard for utility modules and enables a real energy gain of 10–20% depending on ground albedo.

Trade-offs
Efficiency Below the Segment Leader

The Jinko Solar Tiger Neo 66HL4M-BDX achieves 24.06% efficiency at the same maximum power of 650 W — a 0.76 percentage point advantage over DMEGC (23.3%). In projects with strict area constraints or where string layout optimization is critical, this gap may tip the decision toward an alternative.

15-Year Product Warranty – Below the Premium Standard

Jinko Solar and BYD offer 25-year product warranties (materials and workmanship) on comparable TOPCon series. DMEGC's 15-year term is commercially acceptable, but may be a negative factor in utility tenders or during project assessment by conservative lenders requiring full coverage of the loan repayment period.

Notes from the database
  • Efficiency of 23.1% matches the TOPCon 600-650W median
  • Power density of 230.7 W/m² packs 3.0 W/m² more into the same footprint vs TOPCon 600-650W median (227.7 W/m²)
  • At -0.29%/°C, hot weather performance is typical for TOPCon 600-650W panels
  • Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface
  • In the top 11% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 645 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 23.10 % Typical Segment median 22.80%
Vmpp · Impp 48.05 V · 13.44 A Operating point at max power
Voc · Isc 57.90 V · 14.19 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2465×1134×30 mm · 2.80 m² of roof
Weight 33.5 kg Typical Typical · median 32.7 kg
Cells 156 · 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 · 0.048 %/°C
NOCT 42 °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 564 W guaranteed
Degradation 1.00 → 0.40 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by DMEGC in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 645 Wp appear here. The rest cover the whole series.

Power Warranty Power 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
DMEGC DM645M10T-B78HSW 645 W 23.10% -0.290 33.5 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +2.1 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +35 W, lighter, +2.1 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +30 W, lighter, +1.9 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +1.9 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +50 W, cooler, +1.8 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, lighter, +1.7 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg Cooler, lighter, +1.7 pp
DM630M10T-B78HSW 630 W 22.50% -0.290 33.5 kg -15 W, -0.6 pp
DM635M10T-B78HSW 635 W 22.70% -0.290 33.5 kg -10 W, -0.4 pp
DM640M10T-B78HSW 640 W 22.90% -0.290 33.5 kg -0.2 pp
DM650M10T-B78HSW 650 W 23.30% -0.290 33.5 kg Very close match
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +55 W, cooler, +1.9 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg +25 W, cooler, +1.7 pp

Found 616 panels of the same or similar size to this one, within ±10 mm. See them here Found 616 panels of the same or similar size to this one, within ±25 mm. See them here Found 616 panels of the same or similar size to this one, within ±50 mm. See them here Found 1813 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty does the DMEGC DMxxxM10T-B78HSW series offer?
The DMxxxM10T-B78HSW series is backed by a 15-year product warranty covering material and workmanship defects, as well as a 30-year linear power output warranty. According to the manufacturer's datasheets, after 30 years of operation the module is guaranteed to retain at least 87.4% of its nominal power. This is among the most competitive warranty standards in the utility and C&I module segment, and directly contributes to predictable revenue streams over the full lifetime of the installation.
What is TOPCon technology and why does the DMxxxM10T-B78HSW series use it?
TOPCon (Tunnel Oxide Passivated Contact) is a next-generation N-type cell technology that uses an ultra-thin tunnel oxide passivation layer to significantly reduce charge carrier recombination. In practice, this translates to higher conversion efficiency — modules in this series achieve up to 23.3% — and a low temperature coefficient of approximately -0.29%/°C. Compared to conventional PERC cells, TOPCon exhibits slower power degradation over time, which is particularly significant when modeling 30-year energy yield forecasts.
How does bifaciality work in the DMEGC DMxxxM10T-B78HSW panels, and when does it genuinely pay off?
Bifacial modules in this series generate electricity from both the front and rear surfaces by capturing irradiance reflected from the ground or mounting surface (albedo effect). The greatest yield gains are achieved with high-albedo surfaces: light-colored gravel ballast, white roofing membranes, snow cover, or sand can contribute anywhere from a few percent to more than 10% additional energy production. In utility-scale ground-mounted PV plants with adequate mounting height, the bifacial gain is particularly pronounced. On dark or vegetated rooftops, the benefit is marginal.
Does the bi-glass construction of the DMxxxM10T-B78HSW series affect module durability?
Yes, the dual-glass (bi-glass) structure eliminates the rear encapsulant backsheet, which in conventional modules is the weakest link in terms of moisture vapor transmission and UV-induced degradation. The dual-glass configuration also provides superior resistance to ammonia exposure, which is especially relevant for installations near livestock facilities. Furthermore, the all-glass construction better withstands large thermal cycling ranges and mechanical load stresses. The trade-off is a higher module weight of approximately 33.5 kg, which must be factored into the structural design of the mounting system.
Are DMEGC DMxxxM10T-B78HSW panels suitable for industrial installations and utility-scale PV plants?
Yes, the DMxxxM10T-B78HSW series is specifically designed for the C&I (commercial & industrial) and utility segments. Peak power output of up to 650 Wp combined with high module efficiency allows maximum energy harvest on constrained footprints. The bifacial design and bi-glass construction perform particularly well in ground-mounted installations, flat industrial rooftops with light-colored membranes, and utility-scale PV farms. DMEGC holds Tier 1 bankability status according to Bloomberg NEF, which simplifies the process of securing project financing for large-scale developments.
How do DMEGC DMxxxM10T-B78HSW panels perform in high-temperature conditions?
The N-type TOPCon technology used in this series delivers a power temperature coefficient of approximately -0.29%/°C, meaning the module loses just under 0.3% of its output for every degree Celsius the cell temperature rises above 25°C. This is a measurably better result than typical PERC modules, which range from -0.34 to -0.37%/°C. In real-world summer conditions, when cell temperatures commonly reach 55–70°C, the DMxxxM10T-B78HSW modules generate more energy than legacy PERC designs of equivalent nominal power rating.
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