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LEDVANCE M685~705N66UB-SF-F7-705
LEDVANCE Brand review

M685~705N66UB-SF-F7-705

705 Wp TOPCon Bifacial 70%
ComparePV verdict

Light for its output, needs the roof space

Rank 166 of 14,005
Compare panels Datasheet PDF
Power (Wp)
705
Weak · bottom 22%
Efficiency (%)
22.70
Weak · bottom 23%
Density (Wp/m²)
227.0
Weak · bottom 21%
Temp (%/°C)
-0.300
Weak · bottom 22%
Weight (kg)
34.5
Strong · 3.5 kg below median
Warranty (yrs)
30
Typical · median 30 yrs

The LEDVANCE M685~705N66UB-SF-F7 series are dual-sided N-type modules using TOPCon technology, designed for high energy yield even under less-than-ideal conditions. The glass-glass construction enhances protection against moisture and mechanical stress, effectively reducing the risk of accelerated aging in challenging operational environments. Thanks to its limited PID effect and stable performance at higher temperatures, this series helps maintain predictable power output and minimizes power losses over time, which is critical for project profitability calculations. These modules are also designed for reliable installation-featuring original Stäubli MC4 EVO2 connectors and solutions for uniform current collection (MBB). This is an excellent choice for utility-scale PV farms, commercial and industrial installations, and large rooftops, where durability, resilience, and a long product warranty with linear power decay are essential.

Ranking

420 panels in the segment TOPCon 700-750 W
Metric This panel Median Position in segment Overall rank
Module efficiency 22.70% 23.00% Weak · bottom 23% 3,307
Power density 227.0 230.2 Weak · bottom 21% 3,361
Temperature coefficient -0.300 -0.290 Weak · bottom 22% 6,093
Weight per kWp 48.9 52.9 Strong · top 16% 2,611
Performance warranty 30 yrs 30 yrs Typical 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

6 positive · 5 caution
Best for

Commercial, utility-scale and hot-climate.

Not ideal for

Roofs where every square metre has to count, hot climates and tight roof space.

Strengths
48.9 kg per kWp

Top 16% of the TOPCon 700-750 W segment, against a median of 52.9.

Watch-outs
227.0 watts per square metre

Bottom 21% of the TOPCon 700-750 W segment, against a median of 230.2.

-0.300 %/°C temperature coefficient

Bottom 22% of the TOPCon 700-750 W segment, against a median of -0.290.

22.70% module efficiency

Bottom 23% of the TOPCon 700-750 W segment, against a median of 23.00%.

What owners get
N-type TOPCon + glass-glass design

N-type TOPCon cells combined with a glass-glass (double-glass) construction reduce LID/LETID degradation and improve moisture sealing, which matters for industrial rooftop installations and utility-scale PV farms exposed to harsher operating conditions.

30-year linear power warranty

The manufacturer offers a 25-year product warranty and a 30-year linear power warranty - a term comparable to leading TOPCon peer series (Renesola RS9, Luxen N6, Hanersun HiTouch 6N), making long-term LCOE calculations more favorable.

Up to 22.7% efficiency, on par with segment leaders

Peak efficiency of 22.7% matches the best comparable TOPCon series on the market (Renesola RS9-685~705NG-E1, Luxen N6, Hanersun HiTouch 6N), so the module does not lag behind the 2024-2026 top tier in performance.

Genuine Stäubli MC4 EVO2 connectors and MBB technology

The use of certified Stäubli MC4 EVO2 connectors and multi-busbar (MBB) cell architecture improves electrical connection reliability and current collection uniformity, translating into lower resistive losses across the installation.

Bifacial design for increased energy yield

The bifacial construction captures additional reflected irradiance on the rear side of the module, which on bright ground surfaces or in ground-mount configurations can boost annual energy yield by several percentage points versus monofacial modules.

Trade-offs
No Tier-1 (BNEF) manufacturer status

LEDVANCE is not on BloombergNEF's Tier-1 list (as of 2026), unlike some suppliers of comparable TOPCon series. This can complicate securing project financing for large-scale PV farms, as banks often require Tier-1-listed modules.

Short brand track record in the PV market

The LEDVANCE brand has operated since 2016, and the M685~705N66UB-SF-F7 series was only released in 2024 - a shorter field history means less real-world degradation data compared to manufacturers with a longer track record in the TOPCon segment.

Notes from the database
  • Efficiency of 22.7% matches the TOPCon 700-750W median
  • 226.9 W/m² power density is 3.2 W/m² below TOPCon 700-750W median (230.2 W/m²) - requires larger installation area
  • At -0.30%/°C, hot weather performance is typical for TOPCon 700-750W panels
  • Weight of 34.5 kg (3.5 kg below TOPCon 700-750W median of 38.0 kg) allows easier transport and roof mounting
  • 70% bifaciality enables rear-side power generation, boosting yield by 4-10% on reflective surfaces

Specifications

Open datasheet PDF
Nominal power (Pmax) 705 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.70 % Weak Segment median 23.00%
Vmpp · Impp 40.70 V · 17.33 A Operating point at max power
Voc · Isc 48.20 V · 18.36 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 Strong Strong · 3.5 kg below median
Cells 132 · TOPCon Monocrystalline
Bifaciality 70 % Rear output as a share of front
Coefficient Pmax -0.300 %/°C Weak bottom 22% of its segment
Coefficient Voc · Isc -0.250 · 0.046 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 25 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 616 W guaranteed
Degradation 0.40 % Per year after the first

Datasheet charts

Open datasheet PDF

Measured curves published by LEDVANCE in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 705 Wp appear here. The rest cover the whole series.

30-Year Linear Power Warranty (Guaranteed Power) 30-Year Linear Power Warranty (Guaranteed Power) Whole series Current-voltage curve of the module by different insolation Current-voltage curve of the module by different insolation Whole series Current-voltage curve of the PV module by temperature Current-voltage curve of the PV module by temperature Whole series

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
-0.300 %/°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
LEDVANCE M685~705N66UB-SF-F7-705 705 W 22.70% -0.300 34.5 kg You are here
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, lighter, +2.5 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg Cooler, lighter, +2.3 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg Cooler, +2.3 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg -10 W, cooler, +2.2 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, lighter, +2.1 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg Cooler, lighter, +2.1 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg -35 W, cooler, +2.1 pp
M650P66UM-BF-F3 650 W 20.92% -0.340 32.9 kg -55 W, -1.8 pp, -5 yr warranty
M655P66UM-BF-F3 655 W 21.08% -0.340 32.9 kg -50 W, -1.6 pp, -5 yr warranty
M660P66UM-BF-F3 660 W 21.24% -0.340 32.9 kg -45 W, -1.5 pp, -5 yr warranty
M665P66UM-BF-F3 665 W 21.40% -0.340 32.9 kg Hotter, -1.3 pp, -5 yr warranty
M670P66UM-BF-F3 670 W 21.56% -0.340 32.9 kg Hotter, -1.1 pp, -5 yr warranty
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +100 W, heavier, +2.4 pp
AIKO-A800-GRH78Dw 800 W 24.90% -0.260 39.8 kg +95 W, heavier, +2.2 pp
AIKO-A795-GRH78Dw 795 W 24.80% -0.260 39.8 kg +90 W, heavier, +2.1 pp
AIKO-A790-GRH78Dw 790 W 24.60% -0.260 39.8 kg +85 W, heavier, +1.9 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 warranty does the LEDVANCE M685~705N66UB-SF-F7 series come with?
The LEDVANCE M685~705N66UB-SF-F7 series includes a 25-year product warranty and a 30-year linear power output warranty. This is among the longer warranty standards in this product class, giving project owners better long-term revenue predictability and making it easier to secure financing for PV installations.
Is the bifacial LEDVANCE M685~705N66UB-SF-F7 worth choosing for a utility-scale PV farm or flat rooftop?
Yes, especially on ground-mounted PV farms and flat rooftops with light-colored or reflective surfaces, where the module's rear side captures reflected irradiance and can boost energy yield by several percentage points over a monofacial panel. On steep pitched roofs, bifacial gain is typically minimal because the mounting angle limits rear-side light access.
What is TOPCon technology and how does it differ from previous-generation PERC panels?
TOPCon (Tunnel Oxide Passivated Contact) uses N-type cells with a thin tunnel oxide passivation layer that reduces carrier recombination, enabling higher efficiency than standard PERC. It also delivers a better temperature coefficient, meaning smaller power losses on hot days. The M685~705N66UB-SF-F7 series uses TOPCon to produce noticeably more annual energy per square meter than typical PERC modules.
Are the LEDVANCE M685~705N66UB-SF-F7 modules compatible with third-party MC4 connectors?
The series ships with genuine Stäubli MC4 EVO2 connectors, the established industry standard. These are mechanically compatible with other MC4-certified connectors; however, to protect the product warranty and maintain electrical safety, it is recommended to use connectors from the same manufacturer or obtain written cross-compatibility confirmation from your inverter or racking supplier.
How does the LEDVANCE M685~705N66UB-SF-F7 series perform under overcast skies and low-irradiance conditions?
N-type TOPCon cells are known for strong low-light performance, generating proportionally more power under diffuse irradiance than PERC modules. The bifacial design additionally captures reflected diffuse light from the ground or cloud cover, helping maintain higher daily energy yield on cloudy days. The series' resistance to PID also ensures stable output over extended operating periods.
Is the LEDVANCE M685~705N66UB-SF-F7 series suitable for large commercial rooftops and industrial PV installations?
Yes. The high power output of up to 705 Wp, durable glass-glass construction resistant to moisture ingress and mechanical loading, Stäubli MC4 EVO2 connectors, and extended warranties — 25-year product and 30-year power — are exactly the attributes prioritized in commercial and industrial projects. The modules perform well on large low-pitched commercial rooftops as well as ground-mounted utility-scale installations.
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