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Talesun TD8G66M/665W
Talesun Brand review

TD8G66M/665W

665 Wp PERC Bifacial 70%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 2,846 of 14,005
Compare panels Datasheet PDF
Power (Wp)
665
Typical for its class
Efficiency (%)
21.40
Typical · median 21.25%
Density (Wp/m²)
214.1
Typical · median 212.5
Temp (%/°C)
-0.340
Typical · median -0.340
Weight (kg)
38.5
Weak · 4.0 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

The Talesun TD8G66M (BIPRO) series are dual-glass modules featuring a dual glass configuration, meticulously designed to genuinely increase energy yield in locations where every additional kilowatt-hour counts. The application of bifacial PERC technology harnesses light reflecting off the ground, proving especially effective on light-colored roofs, ground-mounted structures, carports, and industrial installations.

A key feature of this series is the 12BB and half-cut technology, involving denser connection ribbons and divided cells - a solution supporting more stable performance under partial shading and minimizing connection losses. The manufacturer also highlights high PID resistance and a design optimized for challenging conditions - moisture, dust, and wind - making these modules well-suited for PV farms and facilities demanding enhanced durability. This is an offering for investors seeking to combine greater energy yield with a robust, glass-glass construction.

Ranking

320 panels in the segment PERC 650-700 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.40% 21.25% Typical 8,323
Power density 214.1 212.5 Typical 8,250
Temperature coefficient -0.340 -0.340 Typical 8,778
Weight per kWp 57.9 52.3 Weak · bottom 24% 11,470
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

Commercial, utility-scale and shaded-installations.

Not ideal for

Weight-limited structures.

Watch-outs
57.9 kg per kWp

Bottom 24% of the PERC 650-700 W segment, against a median of 52.3.

Notes from the database
  • At 21.4% efficiency, this panel is on par with typical PERC 650-700W modules
  • Power density of 214.1 W/m² matches the PERC 650-700W median
  • Temperature coefficient of -0.34%/°C matches the PERC 650-700W median
  • Weight of 38.5 kg is 4.0 kg above PERC 650-700W median (34.5 kg) - verify structural support
  • Bifaciality factor of 70% can add 4-10% 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 % Typical Segment median 21.25%
Vmpp · Impp 38.40 V · 17.32 A Operating point at max power
Voc · Isc 46.00 V · 18.41 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 38.5 kg Weak Weak · 4.0 kg above median
Cells 132 · PERC Monocrystalline
Bifaciality 70 % Rear output as a share of front
Coefficient Pmax -0.340 %/°C Typical median -0.340 of its segment
Coefficient Voc · Isc -0.250 · 0.046 %/°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
End-of-warranty output 85.0 % Equals 565 W guaranteed
Degradation 2.00 → 0.45 % First year, then annual

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
-0.340 %/°C against a segment median of -0.340
-
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 TD8G66M/665W 665 W 21.40% -0.340 38.5 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
TP8F66M-650 650 W 20.90% -0.340 34.5 kg Lighter, -0.5 pp, -5 yr warranty
TP8F66M-655 655 W 21.10% -0.340 34.5 kg Lighter, -0.3 pp, -5 yr warranty
TP8F66M-660 660 W 21.30% -0.340 34.5 kg Lighter, -5 yr warranty
TD8G66M/670W 670 W 21.60% -0.340 38.5 kg +0.2 pp
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

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 is the maximum power output of the Talesun TD8G66M (BIPRO) panel?
The TD8G66M series reaches up to 670 Wp thanks to 132 half-cut PERC cells arranged with a 12BB busbar grid. This design reduces current losses and delivers higher module efficiency compared to classic full-cell panels, while maintaining comparable dimensions.
How does the bifacial TD8G66M panel differ from a standard monofacial panel?
Thanks to its dual glass construction and bifacial PERC technology, the TD8G66M generates additional energy from its rear side by capturing light reflected off the ground. In practice, this means extra yield when installed on light-colored roofs, ground-mount structures, carports, or PV farms, where surrounding reflectance is higher than on dark ground.
What warranty comes with the Talesun TD8G66M (BIPRO) panels?
The manufacturer provides a 12-year product warranty and a 30-year linear power output warranty. This is typical for higher-tier glass-glass modules, reflecting their greater resistance to degradation and mechanical damage compared to standard backsheet panels.
Is the Talesun TD8G66M (BIPRO) series still available for purchase?
No, production of the TD8G66M (BIPRO) series has been discontinued by the manufacturer. Limited stock may still be available through distributors while supplies last, but it is no longer offered as a current model in Talesun's lineup. Check availability with your supplier before planning a large installation based solely on this model.
Are TD8G66M panels suitable for industrial and utility-scale PV farms?
Yes, the glass-glass construction with high PID resistance and durability against moisture, dust, and wind make the TD8G66M series well suited to large ground-mount installations and PV farms. The bifacial technology further improves economics in such projects, since ground-mount structures allow full use of the rear-side energy potential.
Who manufactures Talesun panels and is it a Tier 1 supplier?
Talesun is a Chinese solar module manufacturer classified as a Tier 1 supplier, indicating stable financial standing and bankability recognized by project financiers. Tier 1 status matters when securing financing or subsidies for a PV installation, as many lenders require panels from recognized manufacturers.
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