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Techwise Solar TW-660HT
Techwise Solar Brand review

TW-660HT

660 Wp PERC
ComparePV verdict

Light for its output, short guarantee

Rank 4,093 of 14,005
Compare panels Datasheet PDF
Power (Wp)
660
Typical for its class
Efficiency (%)
21.25
Typical · median 21.25%
Density (Wp/m²)
212.5
Typical · median 212.5
Temp (%/°C)
-0.340
Typical · median -0.340
Weight (kg)
32.9
Strong · 1.6 kg below median
Warranty (yrs)
25
Weak · bottom 21%

The Techwise Solar Summit Series is designed for installations where maximizing energy yield from a limited area and ensuring stable performance over many years are paramount. The modules in this series utilize a half-cut architecture, which minimizes internal losses and improves panel performance under partial shading - a crucial factor in installations with features such as chimneys, skylights, or HVAC systems. Depending on the variant, bifacial options are available, allowing for the recovery of additional energy from reflected light from the ground, which is particularly beneficial for ground-mounted and flat-roof projects. The use of a multi busbar multi-contact technology promotes better current collection and increases resistance to micro-cracks during daily operation and transportation. The Summit Series also emphasizes optimal performance at high temperatures and under less direct sunlight, which is relevant in the Polish climate. This makes it a suitable choice for installers, investors in commercial and industrial (C&I) projects, and PV farms who expect predictable results and the flexibility to choose modules that fit their project requirements.

Ranking

320 panels in the segment PERC 650-700 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.25% 21.25% Typical 8,904
Power density 212.5 212.5 Typical 8,959
Temperature coefficient -0.340 -0.340 Typical 8,778
Weight per kWp 49.8 52.3 Strong · top 14% 3,245
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

1 positive · 1 caution
Best for

Commercial, utility-scale, shaded-installations and hot-climate.

Not ideal for

Owners who want a long output guarantee.

Strengths
49.8 kg per kWp

Top 14% of the PERC 650-700 W segment, against a median of 52.3.

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
  • Efficiency of 21.2% matches the PERC 650-700W median
  • At 212.5 W/m² power density, roof space requirements are typical for PERC 650-700W panels
  • At -0.34%/°C, hot weather performance is typical for PERC 650-700W panels
  • 32.9 kg weight - 1.6 kg lighter than PERC 650-700W median (34.5 kg), reducing installation effort
  • In the top 64% for efficiency among all PERC panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 660 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.25 % Typical Segment median 21.25%
Vmpp · Impp 37.83 V · 17.45 A Operating point at max power
Voc · Isc 45.64 V · 18.50 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 32.9 kg Strong Strong · 1.6 kg below median
Cells 132 · PERC Monocrystalline
Coefficient Pmax -0.340 %/°C Typical median -0.340 of its segment
Coefficient Voc · Isc -0.250 · 0.040 %/°C
NOCT 44 °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 542 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
Techwise Solar TW-660HT 660 W 21.25% -0.340 32.9 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +3.9 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, +3.9 pp, +5 yr warranty
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg Cooler, +3.8 pp, +5 yr warranty
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg Cooler, lighter, +3.8 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg Cooler, +3.8 pp, +5 yr warranty
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg Cooler, +3.6 pp, +5 yr warranty
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, +3.6 pp, +5 yr warranty
TW-650HT 650 W 20.92% -0.340 32.9 kg -10 W, -0.3 pp
TW-655HT 655 W 21.09% -0.340 32.9 kg Very close match
TW-665HT 665 W 21.41% -0.340 32.9 kg Very close match
TW-670HT 670 W 21.57% -0.340 32.9 kg +10 W, +0.3 pp
TW-720HT-01-700W 700 W 21.89% -0.300 38.0 kg Cooler, heavier, +5 yr warranty
TW-720HT-01-705W 705 W 22.05% -0.300 38.0 kg +45 W, heavier, +5 yr warranty
TW-720HT-01-710W 710 W 22.21% -0.300 38.0 kg +50 W, heavier, +5 yr warranty
TW-720HT-01-715W 715 W 22.36% -0.300 38.0 kg +55 W, heavier, +1.1 pp
TW-720HT-01-720W 720 W 22.52% -0.300 38.0 kg +60 W, heavier, +1.3 pp
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +145 W, cooler, +3.9 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 is the maximum power output of the Techwise Solar Summit Series panel?
Summit Series modules reach a maximum power output of up to 670 Wp. This high unit power means fewer panels are needed to reach a target system size, reducing mounting structure costs and installation time, especially on large rooftop and ground-mount projects.
What warranty does Techwise Solar offer on the Summit Series?
The manufacturer provides a 12-year product warranty and a 25-year power performance warranty. This means the module is expected to maintain its rated energy output for over two decades, which is an important factor when calculating the return on investment of a PV installation.
What is TOPCon technology in the Summit Series and is it better than PERC?
TOPCon (Tunnel Oxide Passivated Contact) is a newer generation of silicon cell technology that reduces carrier recombination through an additional passivation layer. In practice this results in higher module efficiency and better performance at high temperatures compared to older PERC technology, which matters during hot Polish summers.
Are Summit Series panels suitable for roofs with chimneys or dormers?
Yes, thanks to the half-cut architecture the module is split into smaller cell sections, so partial shading from a chimney, antenna, or dormer causes a smaller drop in output than with conventional full-cell panels. This design reduces the impact of typical roof obstructions on overall system yield.
Is the Summit Series a bifacial panel?
No, in this described configuration the Summit Series operates as a monofacial (one-sided) panel rather than bifacial. It's worth checking the specific model within the line, as the manufacturer also offers bifacial variants of this series in other configurations, intended for example for ground-mount installations.
How does multi busbar technology in the Summit Series differ from standard panels?
Multi busbar means a higher number of thin current-collecting ribbons on the cell surface compared to classic 3-4 busbar designs. This results in more even current collection, lower risk of microcracks during transport and operation, and better mechanical resistance to loads such as wind and snow.
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