--- title: "Waaree WFLW-420 420W Solar Panel - Specs & Review | ComparePV" description: "Waaree WFLW-420 420W solar panel. Specs: 21.10% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/waaree-wflw-420" updated: 2026-09-11 --- # Waaree WFLW-420 Light for its output, short guarantee 954 panels in the segment PERC 400-450 W ## Identity - **Manufacturer:** Waaree - **Model:** WFLW-420 - **Series:** WFLW-420 FLW MONO PERC - **Rated power:** 420 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 400-450 W (954 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 420 W | 410 W | Typical | | | 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 (kg) | 10.5 kg | 22.0 kg | Strong - top 3% | | | Performance warranty | 15 yrs | 25 yrs | Weak - bottom 1% | 13,805 | ### Full peer table | Measure | This panel | Segment median | Standing | 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 | ### 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 out for - **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. - **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. ## Specification ### Electrical - **Rated power (Pmax):** 420 W - **Efficiency:** 21.10 % - **Voltage at Pmax (Vmp):** 42.55 V - **Current at Pmax (Imp):** 9.86 A - **Open-circuit voltage (Voc):** 48.96 V - **Short-circuit current (Isc):** 10.50 A - **Max system voltage:** 600 V ### Temperature - **Temperature coefficient of Pmax:** -0.380 %/degC - **Temperature coefficient of Voc:** -0.360 %/degC - **Temperature coefficient of Isc:** 0.070 %/degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 72 ### Physical - **Length:** 2200 mm - **Width:** 1060 mm - **Thickness:** 20 mm - **Weight:** 10.5 kg - **Area:** 2.33 m2 - **Power density:** 180.1 Wp/m2 ### Warranty and degradation - **Product warranty:** 5 years - **Performance warranty:** 15 years ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 9297 of 14005 | | Power density | 13209 of 14005 | | Temperature coefficient | 13397 of 14005 | | Weight | 109 of 14005 | | Warranty | 13805 of 14005 | ## About this series 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. ## Notable figures - 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 ## Questions ### 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. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/flw-420-42075ffbbe-952fff88d48c.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Just Solar JST-EDMH-(445-465)W-TD (465W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-465w-class) | 465 W | Heavier, +2.7 pp, +15 yr warranty | | [Luxor Solar LX-465M/182R-96+ GG](https://comparepv.com/panel/luxor-lx-465m-182r-96-gg) | 465 W | Heavier, +2.7 pp, +15 yr warranty | | [Maxeon SPR-MAX7-470](https://comparepv.com/panel/maxeon-spr-max7-470) | 470 W | Cooler, +2.6 pp, +25 yr warranty | | [AIKO AIKO-A470-MAH54Mb](https://comparepv.com/panel/aiko-aiko-a470-mah54mb) | 470 W | Cooler, +2.5 pp, +15 yr warranty | | [AIKO AIKO-A460-MAH54Mb](https://comparepv.com/panel/aiko-shenzhen-aiko-digital-energy-technology-co-ltd-aiko-a460-mah54mb-1) | 460 W | Heavier, +2.5 pp, +15 yr warranty | | [TCL Zhonghuan HSM-BD54-LA470](https://comparepv.com/panel/tcl-zhonghuan-hsm-bd54-la470) | 470 W | Cooler, +2.5 pp, +15 yr warranty | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +230 W, 16 kg heavier, +4.1 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +225 W, 16 kg heavier, +3.9 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | +220 W, 16 kg heavier, +3.7 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +215 W, 16 kg heavier, +3.5 pp | | [AIKO AIKO-A630-MAH72Dw](https://comparepv.com/panel/aiko-aiko-a630-mah72dw) | 630 W | +210 W, 22 kg heavier, +3.3 pp | --- Source: https://comparepv.com/panel/waaree-wflw-420 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.