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Talesun TM8G66M-700
Talesun Brand review

TM8G66M-700

700 Wp TOPCon Bifacial 80%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 1,228 of 14,005
Compare panels Datasheet PDF
Power (Wp)
700
Weak · bottom 7%
Efficiency (%)
22.50
Weak · bottom 5%
Density (Wp/m²)
225.3
Weak · bottom 7%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
38.5
Weak · bottom 2%
Warranty (yrs)
30
Typical · median 30 yrs

Talesun TM8G66M (BIPRO) series is designed for installations where real energy yield matters more than just paper parameters. The use of N-type TOPCon double-sided cells effectively captures sunlight from both sides, translating to higher yields in areas with light backgrounds or good light reflection. Modules utilize half-cut technology, enabling better performance during partial shading and offering more stable operation under varying conditions. The 18BB multi-string structure also deserves attention, supporting lower losses and better performance in low-light conditions. In practice, this series addresses a common challenge: production drops in poor weather and installations with non-ideal exposure. Thanks to high PID resistance, the sealed junction box, and durable construction, it proves ideal for solar farms, industrial rooftops, and demanding locations where dust, moisture, and wind are daily occurrences.

Ranking

420 panels in the segment TOPCon 700-750 W
Metric This panel Median Position in segment Overall rank
Module efficiency 22.50% 23.00% Weak · bottom 5% 4,222
Power density 225.3 230.2 Weak · bottom 7% 3,989
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 55.0 52.9 Weak · bottom 2% 9,361
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 · 3 caution
Best for

Utility-scale, commercial and shaded-installations.

Not ideal for

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

Watch-outs
55.0 kg per kWp

Bottom 2% of the TOPCon 700-750 W segment, against a median of 52.9. Ranked 9,361st in the whole database.

22.50% module efficiency

Bottom 5% of the TOPCon 700-750 W segment, against a median of 23.00%. Ranked 4,222nd in the whole database.

225.3 watts per square metre

Bottom 7% of the TOPCon 700-750 W segment, against a median of 230.2. Ranked 3,989th in the whole database.

Notes from the database
  • Efficiency of 22.5% matches the TOPCon 700-750W median
  • 225.3 W/m² power density is 4.9 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
  • #4222 for efficiency, #2165 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 700 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.50 % Weak Segment median 23.00%
Vmpp · Impp 40.50 V · 17.29 A Operating point at max power
Voc · Isc 48.60 V · 18.32 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 38.5 kg Weak Weak · bottom 2%
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 -0.240 · 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
End-of-warranty output 87.4 % Equals 612 W guaranteed
Degradation 1.00 → 0.40 % First year, then annual

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 700 Wp appear here. The rest cover the whole series.

Talesun Solar Linear Warranty Talesun Solar Linear Warranty Whole series TM8G66M/700W TM8G66M/700W 700 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 TM8G66M-700 700 W 22.50% -0.290 38.5 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg -50 W, lighter, +2.7 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, lighter, +2.7 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg Cooler, lighter, +2.5 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg Cooler, lighter, +2.5 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg Cooler, lighter, +2.4 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg -30 W, lighter, +2.3 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg -30 W, lighter, +2.3 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg -30 W, lighter, +2.3 pp
TP8F66M-650 650 W 20.90% -0.340 34.5 kg -50 W, hotter, -1.6 pp
TP8F66M-655 655 W 21.10% -0.340 34.5 kg Hotter, -1.4 pp, -5 yr warranty
TP8F66M-660 660 W 21.30% -0.340 34.5 kg Hotter, -1.2 pp, -5 yr warranty
TD8G66M/665W 665 W 21.40% -0.340 38.5 kg -35 W, hotter, -1.1 pp
TD8G66M/670W 670 W 21.60% -0.340 38.5 kg -30 W, hotter, -0.9 pp
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +105 W, cooler, +2.6 pp
AIKO-A800-GRH78Dw 800 W 24.90% -0.260 39.8 kg +100 W, cooler, +2.4 pp
AIKO-A795-GRH78Dw 795 W 24.80% -0.260 39.8 kg +95 W, cooler, +2.3 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 comes with the Talesun TM8G66M (BIPRO) series?
The TM8G66M (BIPRO) series carries a 12-year product warranty and a 30-year linear power output warranty. This means Talesun covers material and workmanship defects for 12 years, while the guaranteed power degradation curve supports stable energy production over three decades. As a Tier 1 manufacturer, Talesun offers solid backing for these terms in real-world project financing.
Are Talesun TM8G66M panels bifacial, and is it worth it?
Yes, the modules use bifacial N-type TOPCon cells that capture irradiance from both the front and rear side of the panel. The rear-side energy gain depends on the ground surface and mounting height – bright surfaces like gravel, white roofing, or snow give the best results, along with sufficient ground clearance. In typical ground-mount and industrial rooftop installations, this can add several percent extra yield compared to monofacial panels.
How does N-type TOPCon technology in the TM8G66M differ from older PERC cells?
N-type TOPCon cells have lower recombination losses and higher efficiency than the P-type PERC cells commonly used before, resulting in higher module power for the same surface area – up to 710 Wp in this series. TOPCon also resists light- and temperature-induced degradation better, so the panel loses power more slowly over its service life than comparable PERC modules.
Are TM8G66M (BIPRO) panels suitable for a utility-scale solar farm in harsh conditions?
Yes, the series is designed for large ground-mount installations and industrial rooftops exposed to dust, humidity, and strong wind. The sealed junction box protects the electronics from moisture ingress, and high PID resistance prevents power loss at the high system voltages typical of large PV farms. The reinforced frame also ensures mechanical stability under wind and snow loads.
How do TM8G66M panels handle partial shading from chimneys or poles?
Thanks to half-cut cell technology, each cell is split in half and wired into independent circuits, so shading part of the module reduces output only in that shaded segment rather than shutting down the whole panel. In practice this means lower energy losses from partial shading by nearby structures compared to older full-cell panels, which matters on roofs with imperfect sun exposure.
What benefit does the 18BB multi-busbar design offer in Talesun TM8G66M panels?
The 18-busbar layout shortens the current path within each cell, reducing resistive losses and improving performance especially in low-light conditions such as early morning, evening, or overcast days. More, thinner busbars also increase the cell's mechanical resistance to microcracks, contributing to a more stable, longer-lasting panel under demanding operating conditions.
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