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Waaree Brand review

WFLW-420

420 Wp PERC
ComparePV verdict

Light for its output, short guarantee

Rank 12,429 of 14,005
Compare panels Datasheet PDF
Power (Wp)
420
Typical for its class
Efficiency (%)
21.10
Strong · top 17%
Density (Wp/m²)
180.1
Weak · bottom 1%
Temp (%/°C)
-0.380
Weak · bottom 2%
Weight (kg)
10.5
Strong · 11.5 kg below median
Warranty (yrs)
15
Weak · bottom 1%

The Waaree WFLW-420 FLW MONO PERC series redefines installation possibilities on surfaces that previously excluded the installation of classic photovoltaics. The use of advanced, flexible monocrystalline PERC cells allows for high efficiency with a drastic reduction in module weight. It is a key solution for structures with limited structural load-bearing capacity, such as membrane-covered roofs of industrial halls or utility buildings. Thanks to their flexibility, these panels allow for trouble-free mounting on curved surfaces, making them the most common choice in the maritime and caravanning sectors. Unlike rigid modules, the FLW series eliminates the risk of micro-cracks when operating on dynamic substrates. The unique composite coating used replaces heavy tempered glass, while simultaneously providing full protection against degradation caused by external factors. This series solves the problem of space and weight deficits, offering the maximum power-to-area ratio while maintaining a minimal profile. It is a product created for investors demanding aesthetics and functionality where every kilogram of load counts. Thanks to glued or riveted mounting technology, installation time is reduced to a minimum, which distinguishes these panels from traditional systems that require ballast.

Ranking

954 panels in the segment PERC 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.10% 20.60% Strong · top 17% 9,297
Power density 180.1 206.2 Weak · bottom 1% 13,209
Temperature coefficient -0.380 -0.350 Weak · bottom 2% 13,397
Weight per kWp 25.0 53.0 Strong · top 3% 109
Performance warranty 15 yrs 25 yrs Weak · bottom 1% 13,805
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

2 positive · 3 caution
Best for

Off-grid and commercial.

Not ideal for

Owners who want a long output guarantee, roofs where every square metre has to count and hot climates.

Strengths
25.0 kg per kWp

Top 3% of the PERC 400-450 W segment, against a median of 53.0. Ranked 109th in the whole database.

21.10% module efficiency

Top 17% of the PERC 400-450 W segment, against a median of 20.60%.

Watch-outs
15 year performance warranty

Bottom 1% of the PERC 400-450 W segment, against a median of 25 yrs. Ranked 13,805th in the whole database.

180.1 watts per square metre

Bottom 1% of the PERC 400-450 W segment, against a median of 206.2. Ranked 13,209th in the whole database.

-0.380 %/°C temperature coefficient

Bottom 2% of the PERC 400-450 W segment, against a median of -0.350. Ranked 13,397th in the whole database.

Notes from the database
  • At 21.1% efficiency, this panel is on par with typical PERC 400-450W modules
  • Power density of 180.1 W/m² is 26.1 W/m² below PERC 400-450W median (206.2 W/m²) - needs more roof space
  • -0.38%/°C temperature coefficient - 0.03pp worse than PERC 400-450W median (-0.35%/°C), expect higher hot weather losses
  • At 10.5 kg, this panel is 11.5 kg lighter than PERC 400-450W median (22.0 kg) - easier handling during installation
  • In the top 66% for efficiency among all PERC panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 420 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.10 % Strong Segment median 20.60%
Vmpp · Impp 42.55 V · 9.86 A Operating point at max power
Voc · Isc 48.96 V · 10.50 A Sizes the string length
Max system voltage 600 V Longer strings than 1000 V modules
Dimensions 2200×1060×20 mm · 2.33 m² of roof
Weight 10.5 kg Strong Strong · 11.5 kg below median
Cells 72 · PERC Monocrystalline
Coefficient Pmax -0.380 %/°C Weak bottom 2% of its segment
Coefficient Voc · Isc -0.360 · 0.070 %/°C
Product warranty 5 years Hardware defects only
Performance warranty 15 years Weak bottom 1% · median 25 yrs

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
-0.380 %/°C against a segment median of -0.350
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Waaree WFLW-420 420 W 21.10% -0.380 10.5 kg You are here
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg Heavier, +2.7 pp, +15 yr warranty
LX-465M/182R-96+ GG 465 W 23.80% -0.260 23.5 kg Heavier, +2.7 pp, +15 yr warranty
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg Cooler, +2.6 pp, +25 yr warranty
AIKO-A470-MAH54Mb 470 W 23.60% -0.260 21.5 kg Cooler, +2.5 pp, +15 yr warranty
AIKO-A460-MAH54Mb 460 W 23.60% -0.290 20.5 kg Heavier, +2.5 pp, +15 yr warranty
HSM-BD54-LA470 470 W 23.60% -0.260 21.5 kg Cooler, +2.5 pp, +15 yr warranty
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg +230 W, 16 kg heavier, +4.1 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg +225 W, 16 kg heavier, +3.9 pp
AIKO-A640-MAE72Mw 640 W 24.80% -0.260 27.0 kg +220 W, 16 kg heavier, +3.7 pp
AIKO-A635-MAE72Mw 635 W 24.60% -0.260 27.0 kg +215 W, 16 kg heavier, +3.5 pp
AIKO-A630-MAH72Dw 630 W 24.40% -0.260 32.5 kg +210 W, 22 kg heavier, +3.3 pp

Found 1 panel of the same or similar size to this one, within ±10 mm. See them here Found 1 panel of the same or similar size to this one, within ±25 mm. See them here Found 69 panels of the same or similar size to this one, within ±50 mm. See them here Found 2680 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
How much does the Waaree WFLW-420 FLW MONO PERC panel weigh, and how much lighter is it than a standard 420 W module?
The WFLW-420 FLW weighs approximately 10.5 kg with dimensions of 2200×1060×20 mm, roughly 2-3 times lighter than a rigid glass module of similar power, which typically weighs 22-25 kg. This weight difference is critical for membrane roofs, metal-sheet warehouses, or boats, where additional structural load is limited or not permitted.
Can the WFLW-420 FLW panels be installed on curved surfaces, such as a boat roof or camper van?
Yes, this is the primary application for this series. The flexible construction built on monocrystalline PERC cells allows the panel to conform to gently curved surfaces, typical of boat hulls, camper vans, or arched roof profiles. The manufacturer recommends staying within the minimum bend radius listed in the datasheet to avoid excessive stress on the cells.
What warranty comes with the Waaree WFLW-420 FLW MONO PERC panels?
The WFLW-420 FLW series carries a 5-year product warranty (materials and workmanship) and a 15-year power output warranty. These are standard terms for the flexible panel segment, shorter than rigid glass modules that typically offer 25-30-year power warranties, due to the composite materials used instead of tempered glass.
How does the FLW panel's top layer differ from standard tempered glass?
Instead of heavy tempered glass, the WFLW-420 FLW uses a scratch-resistant composite (polymer) coating that also reduces dust accumulation while protecting the cells from environmental factors. This makes the module significantly lighter and more resistant to vibration and microcracks than rigid glass panels, though the surface requires more careful handling than glass.
How are the WFLW-420 FLW panels mounted - do they need ballast like rigid modules?
No, the FLW series does not require ballast systems typical of classic flat-roof installations. Panels are mounted using adhesive (peel-and-stick) or mechanical fixing, such as riveting to the substrate. This significantly shortens installation time and eliminates extra structural load, which matters for roofs with limited load-bearing capacity.
Does a 420 W panel from the FLW series produce the same power as a similarly sized rigid module?
Maximum power output is 420 Wp thanks to 144 efficient monocrystalline PERC cells, comparable to rigid modules of similar dimensions. The panel is not bifacial, so energy is generated only from the front side, which is typical for this product segment designed for direct-surface mounting.
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