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Waaree Bi-31-420
Waaree Brand review

Bi-31-420

420 Wp PERC Bifacial 3000%
ComparePV verdict

Warranty pick, heavy for its output

Rank 12,037 of 14,005
Compare panels Datasheet PDF
Power (Wp)
420
Typical for its class
Efficiency (%)
19.32
Weak · bottom 3%
Density (Wp/m²)
193.2
Weak · bottom 4%
Temp (%/°C)
-0.365
Weak · bottom 9%
Weight (kg)
27.5
Weak · 5.5 kg above median
Warranty (yrs)
30
Strong · top 17%

The Waaree AHNAY series are bifacial glass-glass modules designed to genuinely increase energy yield from the same installation surface - especially on sites where the rear side of the module also generates electricity. The use of dual-glass construction enhances weather resistance and reduces the risk of micro-cracks, which is crucial for long-term operation. The AHNAY variants are available in both Mono PERC and N-type TOPCon technologies, making it easier to select the right module for project requirements and performance profiles (e.g., higher parameter stability over time). An additional advantage is resistance to PID and optimized heat dissipation thanks to split junction box solutions, which help limit the risk of hotspots and performance degradation. This is the series for investors building installations on flat roofs, PV farms, and commercial sites, where low energy costs and predictable power generation even under diffuse light and partial shading matter.

Ranking

954 panels in the segment PERC 400-450 W
Metric This panel Median Position in segment Overall rank
Module efficiency 19.32% 20.60% Weak · bottom 3% 12,790
Power density 193.2 206.2 Weak · bottom 4% 12,773
Temperature coefficient -0.365 -0.350 Weak · bottom 9% 13,045
Weight per kWp 65.5 53.0 Weak · bottom 2% 13,082
Performance warranty 30 yrs 25 yrs Strong · top 17% 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

1 positive · 3 caution
Best for

Commercial, utility-scale and shaded-installations.

Not ideal for

Weight-limited structures, tight roof space and roofs where every square metre has to count.

Strengths
30 year performance warranty

Top 17% of the PERC 400-450 W segment, against a median of 25 yrs.

Watch-outs
65.5 kg per kWp

Bottom 2% of the PERC 400-450 W segment, against a median of 53.0. Ranked 13,082nd in the whole database.

19.32% module efficiency

Bottom 3% of the PERC 400-450 W segment, against a median of 20.60%. Ranked 12,790th in the whole database.

193.2 watts per square metre

Bottom 4% of the PERC 400-450 W segment, against a median of 206.2. Ranked 12,773rd in the whole database.

Notes from the database
  • At 19.3% efficiency, this panel is 1.3pp below the PERC 400-450W median of 20.6%
  • At 193.2 W/m², this panel generates 13.0 W/m² less per unit area than PERC 400-450W median (206.2 W/m²)
  • Temperature coefficient of -0.36%/°C matches the PERC 400-450W median
  • Weight of 27.5 kg is 5.5 kg above PERC 400-450W median (22.0 kg) - verify structural support
  • In the top 91% for efficiency among all PERC panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 420 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 19.32 % Weak Segment median 20.60%
Vmpp · Impp 40.61 V · 10.35 A Operating point at max power
Voc · Isc 49.01 V · 11.04 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2094×1038×35 mm · 2.17 m² of roof
Weight 27.5 kg Weak Weak · 5.5 kg above median
Cells 144 · PERC Monocrystalline
Bifaciality 3000 % Rear output as a share of front
Coefficient Pmax -0.365 %/°C Weak bottom 9% of its segment
Coefficient Voc · Isc -0.285 · 0.055 %/°C
NOCT 43 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 30 years Strong top 17% · median 25 yrs
End-of-warranty output 82.0 % Equals 345 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
-
With bifacial gain
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.365 %/°C against a segment median of -0.350
-
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
Waaree Bi-31-420 420 W 19.32% -0.365 27.5 kg You are here
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg Cooler, lighter, +4.5 pp
LX-465M/182R-96+ GG 465 W 23.80% -0.260 23.5 kg +45 W, cooler, +4.5 pp
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg Cooler, +4.4 pp, +10 yr warranty
AIKO-A470-MAH54Mb 470 W 23.60% -0.260 21.5 kg Cooler, lighter, +4.3 pp
AIKO-A460-MAH54Mb 460 W 23.60% -0.290 20.5 kg Cooler, lighter, +4.3 pp
HSM-BD54-LA470 470 W 23.60% -0.260 21.5 kg Cooler, lighter, +4.3 pp
WSD-385 385 W 17.71% -0.380 23.5 kg Lighter, -1.6 pp, -5 yr warranty
WSD-390 390 W 17.94% -0.380 23.5 kg Lighter, -1.4 pp, -5 yr warranty
WSD-395 395 W 18.17% -0.380 23.5 kg Lighter, -1.1 pp, -5 yr warranty
WSD-400 400 W 18.40% -0.380 23.5 kg Lighter, -0.9 pp, -5 yr warranty
Bi-33-425 425 W 19.55% -0.365 23.5 kg Lighter, +0.2 pp, -3 yr warranty
GKA120N-PRO-590W 590 W 23.82% -0.300 26.7 kg +170 W, cooler, +4.5 pp
GKA120N-PRO-585W 585 W 23.62% -0.300 26.7 kg +165 W, cooler, +4.3 pp
BGO 580 580 W 23.50% -0.290 26.0 kg +160 W, cooler, +4.2 pp
GKA120N-PRO-580W 580 W 23.42% -0.300 26.7 kg +160 W, cooler, +4.1 pp

Found 234 panels of the same or similar size to this one, within ±10 mm. See them here Found 325 panels of the same or similar size to this one, within ±25 mm. See them here Found 352 panels of the same or similar size to this one, within ±50 mm. See them here Found 1158 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What is the difference between Waaree AHNAY Mono PERC and N-type TOPCon panel variants?
Both technologies in the AHNAY series share the same dual-glass bifacial construction, but differ mainly in long-term stability and degradation rate. TOPCon modules have a lower annual degradation rate and higher output efficiency than standard PERC, resulting in higher energy yield over the system's lifetime. PERC remains a more budget-friendly option, well suited for cost-sensitive projects.
What is the maximum power output and efficiency of the Waaree AHNAY panel?
Top variants in the AHNAY series reach up to 665 Wp with 132 half-cut cells, and module efficiency reaches around 21.3 percent. This is a high value for dual-glass bifacial modules, allowing more energy to be generated from the same roof or ground-mount area compared to older, less efficient series.
What warranty does Waaree offer on the AHNAY series, and what does it cover?
The manufacturer provides a 12-year product warranty and a 30-year linear power output warranty. This means protection against factory defects for over a decade, plus a predictable, guaranteed power degradation curve over three decades of operation, which simplifies ROI planning for commercial installations and PV farms.
Do Waaree AHNAY bifacial panels actually increase energy production compared to standard modules?
Yes, the dual-glass construction lets the rear side of the module capture light reflected from the ground, roof, or surroundings, boosting total energy yield, especially over bright, reflective surfaces like gravel or white roofing. The actual gain depends on mounting height and ground albedo, but in practice AHNAY installations outperform comparable monofacial panels of the same surface area.
Are Waaree AHNAY modules PID-resistant and suitable for large-scale PV farms?
Yes, the AHNAY series has certified resistance to potential-induced degradation (PID), which matters in large installations with long strings and high system voltage. A split junction box design also improves heat dissipation and reduces hotspot risk, making this series well suited for PV farms and large commercial rooftop installations.
Does Waaree offer the quality assurance typical of Tier 1 solar manufacturers?
Yes, Waaree is an India-based Tier 1 manufacturer, meaning it has financial stability, its own production capacity, and a documented track record of supplying modules to large commercial and industrial projects worldwide. Tier 1 status increases confidence in the long-term warranty, since the manufacturer has the real capacity to honor it throughout the full 30-year power warranty period.
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