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Talesun TP8F66M-665
Talesun Brand review

TP8F66M-665

665 Wp PERC
ComparePV verdict

Middle of its segment, short guarantee

Rank 3,816 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)
34.5
Typical · median 34.5 kg
Warranty (yrs)
25
Weak · bottom 21%

The Talesun BISTAR TP8F66M / TP8F66M(H) series is designed for large-scale installations where stable module performance, minimal energy losses, and predictable energy yield are crucial. The application of 12BB technology and half-cell cells enhances current flow within the module and supports higher efficiency in real-world conditions - especially under partial shading and uneven irradiance. A characteristic feature of this series is the new wiring layout, which minimizes internal losses and helps better manage operating temperature, reducing the risk of localized overheating. Another distinguishing feature is enhanced PID resistance, verified through testing, which is particularly important for systems operating at high system voltages. In practice, the TP8F66M and TP8F66M(H) will excel in solar farms, commercial rooftops, and projects where lower energy costs throughout the entire life cycle are a priority. The complete solution is complemented by an IP68 junction box, ideal for demanding weather conditions.

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 51.9 52.3 Typical 5,294
Performance warranty 25 yrs 30 yrs Weak · bottom 21% 9,798
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

Owners who want a long output guarantee.

Watch-outs
25 year performance warranty

Bottom 21% of the PERC 650-700 W segment, against a median of 30 yrs.

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
  • #8323 for efficiency, #8778 for temperature performance out of 14005 panels

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 34.5 kg Typical Typical · median 34.5 kg
Cells 132 · PERC Monocrystalline
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 25 years Weak bottom 21% · median 30 yrs
End-of-warranty output 84.8 % Equals 546 W guaranteed
Degradation 2.00 → 0.55 % 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
-

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
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Talesun TP8F66M-665 665 W 21.40% -0.340 34.5 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, +3.6 pp, +5 yr warranty
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg Cooler, +3.5 pp, +5 yr warranty
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 -15 W, -0.5 pp
TP8F66M-655 655 W 21.10% -0.340 34.5 kg -10 W, -0.3 pp
TP8F66M-660 660 W 21.30% -0.340 34.5 kg Very close match
TD8G66M/670W 670 W 21.60% -0.340 38.5 kg Heavier, +0.2 pp, +5 yr warranty
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 product and power warranty for Talesun BISTAR TP8F66M panels?
The TP8F66M series comes with a 12-year product warranty and a 25-year linear power output warranty. Talesun is a Tier 1 manufacturer, which adds extra confidence for long-term investment - in practice this means predictable energy yield throughout the system's lifetime, even in large-scale PV farm projects where long-term parameter stability is key to a solid return on investment.
How do the half-cut cells used in the TP8F66M differ from standard full-size cells?
Half-cut cells split a standard cell into two halves, reducing current losses and internal module resistance. Combined with the 12BB (12 busbar) technology used in the TP8F66M, this improves current flow and boosts efficiency, especially under partial shading from clouds, chimneys, or dirt - the module then loses less power than a panel built with full-size cells.
Are Talesun TP8F66M panels suitable for large solar farms and industrial rooftop installations?
Yes, the TP8F66M series was specifically designed for utility-scale projects such as PV farms, warehouse, and industrial building rooftops. Power output up to 670 Wp reduces the number of modules needed to reach a given system capacity, lowering installation, cabling, and mounting structure costs per installed kilowatt - which helps reduce LCOE in commercial-scale projects.
What does enhanced PID resistance in the TP8F66M mean and why does it matter?
PID (Potential Induced Degradation) is a gradual power loss caused by high system voltage acting on the cells. Talesun confirms enhanced PID resistance for the TP8F66M series through testing, which matters in large installations operating at high DC voltages - it reduces the risk of premature performance drop and supports stable energy production throughout the warranty period.
Are Talesun BISTAR TP8F66M panels bifacial modules?
No, the TP8F66M series consists of monofacial panels built on PERC cell technology. This means they generate power only from the front surface, unlike bifacial panels that also capture light reflected from the ground. This design works well for standard rooftop and ground-mount installations where the rear side of the module has no access to light.
Does Talesun, as a manufacturer, guarantee high quality and investment security for the TP8F66M panels?
Talesun is a Chinese Tier 1 manufacturer, meaning the company has an established production track record, stable financials, and is regularly audited by independent financial institutions. The TP8F66M panels also feature an IP68-rated junction box, resistant to moisture and dust, ensuring reliable operation in demanding weather conditions throughout the system's operating life.
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