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Talesun TM7G78M/640W
Talesun Brand review

TM7G78M/640W

640 Wp N-type Bifacial 80%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 2,116 of 14,005
Compare panels Datasheet PDF
Power (Wp)
640
Strong · top 11%
Efficiency (%)
22.90
Typical · median 22.77%
Density (Wp/m²)
229.0
Typical · median 227.7
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
35.0
Weak · 2.5 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The Talesun BIPRO TM7G78M series features advanced bifacial modules that set new standards in the performance of large-scale photovoltaic farms. Thanks to the use of bifacial technology and half-cut cells, these panels allow for the recovery of energy reflected from the ground, which significantly increases the total annual yield. The use of 10-busbar (10BB) technology effectively minimizes transmission losses and reduces the risk of micro-cracks, translating into stable system operation for decades. The robust glass-glass construction solves the problem of rapid module degradation in harsh weather conditions, providing exceptional resistance to the PID phenomenon and high mechanical loads. This is an ideal solution for investors seeking to maximize return on investment (ROI) by realistically lowering the levelized cost of energy (LCOE). Unlike standard monofacial panels, the TM7G78M series performs excellently in locations with a high light reflection coefficient, such as light gravel or sandy surfaces. It is primarily dedicated to professional commercial installations and solar farms, where every additional watt of power obtained from the ground surface counts. Choosing this series guarantees higher resistance to high operating temperatures, making it an unrivaled solution for demanding large-scale projects.

Ranking

359 panels in the segment N-type 600-650 W
Metric This panel Median Position in segment Overall rank
Module efficiency 22.90% 22.77% Typical 2,359
Power density 229.0 227.7 Typical 2,389
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 54.7 52.7 Weak · bottom 25% 9,078
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 1 caution
Best for

Utility-scale, commercial, shaded-installations and hot-climate.

Not ideal for

Weight-limited structures.

Watch-outs
54.7 kg per kWp

Bottom 25% of the N-type 600-650 W segment, against a median of 52.7.

Notes from the database
  • At 22.9% efficiency, this panel is on par with typical N-type 600-650W modules
  • At 228.9 W/m² power density, roof space requirements are typical for N-type 600-650W panels
  • At -0.29%/°C, hot weather performance is typical for N-type 600-650W panels
  • At 35.0 kg (2.5 kg above N-type 600-650W median of 32.5 kg), requires checking roof load capacity
  • Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof

Specifications

Open datasheet PDF
Nominal power (Pmax) 640 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.90 % Typical Segment median 22.77%
Vmpp · Impp 48.15 V · 13.30 A Operating point at max power
Voc · Isc 56.73 V · 13.94 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2465×1134×35 mm · 2.80 m² of roof
Weight 35.0 kg Weak Weak · 2.5 kg above median
Cells 156 · N-type 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 -0.240 · 0.043 %/°C
NOCT 43 °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

Datasheet charts

Open datasheet PDF

Measured curves published by Talesun in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 640 Wp appear here. The rest cover the whole series.

Talesun Solar Linear Warranty Talesun Solar Linear Warranty Whole series TM7G78M/640W – Current-Voltage and Power-Voltage Curves at Different Irradiance TM7G78M/640W – Current-Voltage and Power-Voltage Curves at Different Irradiance 640 W

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
Talesun TM7G78M/640W 640 W 22.90% -0.290 35.0 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +2.3 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg +40 W, lighter, +2.3 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg +35 W, lighter, +2.1 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +2.1 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg +30 W, lighter, +1.9 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg +30 W, lighter, +1.9 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg Cooler, lighter, +1.9 pp
TP7F78M-580W 580 W 20.70% -0.350 31.5 kg -60 W, hotter, -2.2 pp
TP7F78M-585W 585 W 20.90% -0.350 31.5 kg -55 W, hotter, -2.0 pp
TP7F78M-590W 590 W 21.10% -0.350 31.5 kg -50 W, hotter, -1.8 pp
TP7F78M-595W 595 W 21.30% -0.350 31.5 kg Hotter, -1.6 pp, -5 yr warranty
TP7F78M-600W 600 W 21.50% -0.350 31.5 kg Hotter, -1.4 pp, -5 yr warranty
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg +60 W, cooler, +2.1 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg +55 W, cooler, +2.0 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg +30 W, cooler, +1.9 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
How does the bifacial technology in Talesun BIPRO TM7G78M panels differ from standard monofacial modules?
BIPRO TM7G78M panels use bifacial cells that generate power from both the front and rear side of the module. This allows them to capture light reflected off the ground, such as from bright gravel or sandy surfaces. In practice, this results in additional annual energy yield of up to several percent compared to classic monofacial panels on the same installation area.
What is the maximum power output of the TM7G78M module and which installations is it suited for?
Panels in the TM7G78M series reach up to 660 Wp, making them among the higher-power large-format modules on the market. Due to their high output and bifacial design, they are dedicated primarily to professional commercial installations and ground-mounted solar farms, where maximizing power per square meter of land matters most rather than typical residential rooftop mounts.
What warranty applies to Talesun BIPRO TM7G78M panels?
The manufacturer provides a 12-year product warranty and a 30-year linear power output warranty. This means the module maintains a guaranteed, gradually declining performance level as specified in the datasheet for three decades, an important factor when calculating long-term ROI for large-scale farm projects.
What does N-type cell technology and the 10BB busbar design mean for these panels?
N-type cells feature lower degradation over time and better performance at high operating temperatures compared to older P-type cells. The 10-busbar (10BB) design means ten thin conductive paths on the cell surface, which reduces electrical resistance, lowers transmission losses, and minimizes the risk of microcracks, increasing module durability under varying conditions.
Does the glass-glass construction in TM7G78M handle moisture and PID degradation better than standard glass-backsheet panels?
Yes, the glass-glass encapsulation, where cells are sandwiched between two glass panes instead of a backsheet, provides significantly better sealing against moisture ingress. As a result, TM7G78M panels resist potential-induced degradation (PID) more effectively and maintain mechanical stability even under heavy snow or wind loads, extending the system's practical service life.
Is Talesun a Tier 1 manufacturer, and can it be trusted for a large investment?
Yes, Talesun holds Tier 1 manufacturer status, indicating stable financial standing, extensive production experience, and module bankability recognized by financing institutions for renewable energy projects. The company is headquartered in China and exports panels worldwide. Tier 1 status is a key factor in financing large solar farms, as banks and investors are more willing to lend against equipment from proven suppliers.
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