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DMEGC DM705G12T-B66HSW
DMEGC Brand review

DM705G12T-B66HSW

705 Wp TOPCon Bifacial 80%
ComparePV verdict

Middle of its segment, needs the roof space

Rank 747 of 14,005
Compare panels Datasheet PDF
Power (Wp)
705
Weak · bottom 22%
Efficiency (%)
22.70
Weak · bottom 23%
Density (Wp/m²)
227.0
Weak · bottom 21%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
37.7
Typical · median 38.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

The DMEGC DMxXXG12T-B66HSW series is designed for maximum yield in installations where every meter of structure counts, along with stable performance in varying conditions. The application of N-type cells in TOPCon technology helps minimize typical power losses during operation and maintain high productivity, especially at demanding temperatures and intense sunlight. The double-sided (bifacial) structure allows capturing reflected light energy too - a real benefit on bright roofs, gravel surfaces, and agrivoltaic farms. The glass-glass variant enhances resistance to environmental factors, translating to a lower risk of micro-cracks and material degradation. The DMEGC DMxXXG12T-B66HSW series is an excellent choice for investors seeking high power density and predictable parameters in commercial, industrial, agrivoltaic, and large-scale installations. It stands out from many competitors through the combination of advanced cell architecture with a focus on durability and long-term yield.

Ranking

420 panels in the segment TOPCon 700-750 W
Metric This panel Median Position in segment Overall rank
Module efficiency 22.70% 23.00% Weak · bottom 23% 3,307
Power density 227.0 230.2 Weak · bottom 21% 3,361
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 53.5 52.9 Typical 7,434
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, utility-scale and agrivoltaic.

Not ideal for

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

Watch-outs
227.0 watts per square metre

Bottom 21% of the TOPCon 700-750 W segment, against a median of 230.2.

22.70% module efficiency

Bottom 23% of the TOPCon 700-750 W segment, against a median of 23.00%.

What owners get
Highest Efficiency in the Competitive Set

Maximum module efficiency reaches 23.2%, surpassing all three listed competitors: Gamko New Energy GKA210N132 (23.18%), Renesola RS9-700~720NBG-E1 (23.18%), and Mysolar USA GOLD HJT (23.17%). The higher power density translates into a smaller footprint required to achieve the same energy yield in space-constrained installations.

Low Temperature Coefficient of -0.29%/°C

A power temperature coefficient of -0.29%/°C is more favorable than the PERC baseline (-0.35%/°C) and sits at the top end of the range for TOPCon technology. This results in measurably higher energy production during hot summer months — a key advantage for installations in high-temperature operating environments (>50°C NOCT).

30-Year Linear Warranty, Degradation ≤0.42%/year

The manufacturer guarantees at least 87.4% of nominal power output after 30 years, with annual degradation not exceeding 0.42%. This is among the longest power warranties available in the segment and a compelling argument in LCOE analyses for commercial and utility-scale ground-mount projects.

BNEF Tier 1 – Bankable (Q3 2025)

DMEGC Solar retained its Tier 1 status in the BloombergNEF ranking as of Q3 2025, despite tightened criteria (the reference project threshold was raised from 5 MW to 10 MW). Bankable status streamlines project financing with non-recourse debt — a critical consideration for PV developers seeking project finance from lending institutions.

Glass-Glass Construction with ~80% Bifaciality

Dual tempered glass (2 mm) improves resistance to mechanical loads and PID/UV-induced degradation compared to glass-backsheet variants, while a bifaciality factor of approximately 80% enables a realistic 5–25% gain in additional energy yield from reflected irradiance — particularly valuable in installations over high-albedo surfaces and agrivoltaic projects.

Trade-offs
32.3 kg Weight — Constraint for Low-Load Rooftops

The glass-glass construction results in a module weight of 32.3 kg, approximately 12 kg/m² more than typical glass-backsheet modules (~26–28 kg). This may require structural reinforcement or a certified engineering assessment for older buildings, increasing both cost and project lead time in the residential and BIPV/MIPV segments.

Notes from the database
  • Efficiency of 22.7% matches the TOPCon 700-750W median
  • 226.9 W/m² power density is 3.2 W/m² below TOPCon 700-750W median (230.2 W/m²) - requires larger installation area
  • Temperature coefficient of -0.29%/°C matches the TOPCon 700-750W median
  • Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface
  • In the top 24% for efficiency among all TOPCon panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 705 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.70 % Weak Segment median 23.00%
Vmpp · Impp 40.58 V · 17.40 A Operating point at max power
Voc · Isc 48.62 V · 18.48 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2384×1303×33 mm · 3.11 m² of roof
Weight 37.7 kg Typical Typical · median 38.0 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 · 0.048 %/°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 616 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 705 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 DM705G12T-B66HSW 705 W 22.70% -0.290 37.7 kg You are here
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, lighter, +2.5 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg -30 W, lighter, +2.3 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg Cooler, lighter, +2.3 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg Cooler, lighter, +2.2 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg -35 W, lighter, +2.1 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg -35 W, lighter, +2.1 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg -35 W, lighter, +2.1 pp
DM695G12T-B66HSW 695 W 22.40% -0.290 37.7 kg -10 W, -0.3 pp
DM700G12T-B66HSW 700 W 22.50% -0.290 37.7 kg Very close match
DM710G12T-B66HSW 710 W 22.90% -0.290 37.7 kg Very close match
DM715G12T-B66HSW 715 W 23.00% -0.290 37.7 kg +10 W, +0.3 pp
DM720G12T-B66HSW 720 W 23.20% -0.290 37.7 kg +15 W, +0.5 pp
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +100 W, cooler, +2.4 pp
AIKO-A800-GRH78Dw 800 W 24.90% -0.260 39.8 kg +95 W, cooler, +2.2 pp
AIKO-A795-GRH78Dw 795 W 24.80% -0.260 39.8 kg +90 W, cooler, +2.1 pp
AIKO-A790-GRH78Dw 790 W 24.60% -0.260 39.8 kg +85 W, cooler, +1.9 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 DMEGC DMxxxG12T-B66HSW series carry, and what does it specifically cover?
The DMxxxG12T-B66HSW series comes with a 15-year product warranty covering manufacturing defects and material failures, as well as a 30-year linear power output warranty. The linear power warranty means the manufacturer guarantees that the modules will maintain a defined performance level for three full decades — one of the longest performance warranty standards in the photovoltaic industry. DMEGC is a Tier 1 manufacturer, which simplifies warranty claim enforcement through authorized distributors.
What is TOPCon technology, and does it genuinely outperform older PERC cells?
TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology that minimizes carrier recombination at the cell surface. In practice, this translates to higher efficiency — the DMxxxG12T-B66HSW achieves up to 23.2% — and a lower annual degradation rate compared to PERC cells. N-type TOPCon modules also perform better under high-temperature conditions and diffuse irradiance, which is particularly relevant in climates with a high proportion of overcast days.
Are the DMEGC DMxxxG12T-B66HSW panels suitable for industrial installations and ground-mounted solar farms, or only for rooftop systems?
The DMxxxG12T-B66HSW series is designed primarily for commercial, industrial, and utility-scale ground-mounted applications. The bifacial double-glass construction, with a bifaciality factor of approximately 80%, is especially advantageous in systems with high-albedo ground surfaces such as gravel, concrete, or grass, and in agrivoltaic systems where ground-reflected irradiance reaches the rear side of the module, increasing overall energy yield.
Why does the DMxxxG12T-B66HSW series use glass on both sides instead of a standard backsheet?
The glass-glass construction provides superior mechanical resistance and better protects the cells against moisture ingress, micro-damage, and UV degradation compared to a conventional polymer backsheet. This results in slower long-term degradation and a reduced risk of cell micro-cracking over the module's service life. Combined with bifacial light capture, the glass-glass configuration is the recommended standard for installations where modules are exposed to harsh environmental conditions over many years.
What is the maximum power output of the DMEGC DMxxxG12T-B66HSW module, and how should the right wattage variant be selected for a given project?
The highest wattage variant in this series is 720 Wp. Selecting the appropriate variant depends on the available roof or ground area, the maximum voltage and current ratings of the inverter, and the target annual energy yield. For commercial installations above 100 kWp, using the highest available wattage variants is recommended, as this reduces the total module count, cabling runs, and installation labor cost per unit of installed power.
Is DMEGC a reliable solar panel manufacturer, and is after-sales service readily available?
DMEGC (Dongfang Electric Magnetic Co.) is classified as a Tier 1 manufacturer by BloombergNEF, meaning it meets the stringent financial and production capacity criteria used by banks and project finance institutions when evaluating renewable energy projects. The brand's modules are distributed through authorized commercial partners, ensuring access to technical documentation, post-sales support, and warranty enforcement without requiring direct contact with the manufacturer in China.
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