--- title: "Waaree Bi-66-585 585W Solar Panel - Specs & Review | ComparePV" description: "Waaree Bi-66-585 585W solar panel. Specs: 20.52% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/waaree-bi-66-585" updated: 2026-09-11 --- # Waaree Bi-66-585 Warranty pick, needs the roof space 589 panels in the segment PERC 550-600 W ## Identity - **Manufacturer:** Waaree - **Model:** Bi-66-585 - **Series:** AHNAY SERIES - **Rated power:** 585 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 550-600 W (589 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 585 W | 560 W | Typical | | | Module efficiency | 20.52% | 21.29% | Weak - bottom 3% | 11,244 | | Power density | 205.2 | 212.9 | Weak - bottom 2% | 11,293 | | Temperature coefficient | -0.340 | -0.350 | Typical | 8,778 | | Weight (kg) | 35.5 kg | 30.8 kg | Weak - bottom 5% | | | Performance warranty | 30 yrs | 27 yrs | Strong - top 25% | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.52% | 21.29% | Weak - bottom 3% | 11,244 | | Power density | 205.2 | 212.9 | Weak - bottom 2% | 11,293 | | Temperature coefficient | -0.340 | -0.350 | Typical | 8,778 | | Weight per kWp | 60.7 | 52.7 | Weak - bottom 5% | 12,517 | | Performance warranty | 30 yrs | 27 yrs | Strong - top 25% | 21 | ### Strengths - **30 year performance warranty** - Top 25% of the PERC 550-600 W segment, against a median of 27 yrs. ### Watch out for - **205.2 watts per square metre** - Bottom 2% of the PERC 550-600 W segment, against a median of 212.9. Ranked 11,293rd in the whole database. - **20.52% module efficiency** - Bottom 3% of the PERC 550-600 W segment, against a median of 21.29%. Ranked 11,244th in the whole database. - **60.7 kg per kWp** - Bottom 5% of the PERC 550-600 W segment, against a median of 52.7. Ranked 12,517th in the whole database. - **Best for:** Commercial, utility-scale and shaded-installations. - **Not ideal for:** Roofs where every square metre has to count, tight roof space and weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 585 W - **Efficiency:** 20.52 % - **Voltage at Pmax (Vmp):** 34.34 V - **Current at Pmax (Imp):** 17.04 A - **Open-circuit voltage (Voc):** 41.76 V - **Short-circuit current (Isc):** 17.78 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.340 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 120 - **Bifacial:** yes - **Bifacial gain:** 30.00 ### Physical - **Length:** 2190 mm - **Width:** 1302 mm - **Thickness:** 35 mm - **Weight:** 35.5 kg - **Area:** 2.85 m2 - **Power density:** 205.2 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 82.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.55 % - **Output after 30 years:** 480 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11244 of 14005 | | Power density | 11293 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 12517 of 14005 | | Warranty | 21 of 14005 | ## About this series 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. ## Notable figures - Efficiency of 20.5% is 0.8pp below the \*\*PERC 550-600W\*\* median (21.3%) - At 205.2 W/m², this panel generates 7.7 W/m² less per unit area than \*\*PERC 550-600W\*\* median (212.9 W/m²) - At -0.34%/°C, hot weather performance is typical for \*\*PERC 550-600W\*\* panels - At 35.5 kg (4.7 kg above \*\*PERC 550-600W\*\* median of 30.8 kg), requires checking roof load capacity - In the top 80% for efficiency among all PERC panels ## Questions ### 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. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/AHNAY-SERIES-Bi-66-580-600-WEL-E-and-PD-580-600-120-MPB-HC-0-bbe03a370097.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, lighter, +4.3 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, lighter, +4.1 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | Cooler, lighter, +4.1 pp | | [AIKO AIKO-A630-MAH72Dw](https://comparepv.com/panel/aiko-aiko-a630-mah72dw) | 630 W | +45 W, cooler, +3.9 pp | | [Longi Solar LR7-60HVHL-550M](https://comparepv.com/panel/longi-lr7-60hvhl-550m) | 550 W | Cooler, 19 kg lighter, +3.9 pp | | [Waaree Bi-66-580](https://comparepv.com/panel/waaree-bi-66-580) | 580 W | Very close match | | [Waaree Bi-66-590](https://comparepv.com/panel/waaree-bi-66-590) | 590 W | Very close match | | [Waaree Bi-66-595](https://comparepv.com/panel/waaree-bi-66-595) | 595 W | +10 W, +0.4 pp | | [Waaree Bi-66-600](https://comparepv.com/panel/waaree-bi-66-600) | 600 W | +15 W, +0.5 pp | | [Gamko New Energy GKA210N120](https://comparepv.com/panel/gamko-new-energy-gka210n120) | 680 W | +95 W, lighter, +3.5 pp | | [Gamko New Energy GKA210N120-675](https://comparepv.com/panel/gamko-new-energy-gka210n120-675) | 675 W | +90 W, lighter, +3.3 pp | | [Q-SUN Solar QN-670HJT-01](https://comparepv.com/panel/q-sun-solar-qn-670hjt-01) | 670 W | +85 W, cooler, +3.2 pp | | [Gamko New Energy GKA210N120-670](https://comparepv.com/panel/gamko-new-energy-gka210n120-670) | 670 W | +85 W, lighter, +3.2 pp | | [Q-SUN Solar QN-665HJT-01](https://comparepv.com/panel/q-sun-solar-qn-665hjt-01) | 665 W | +80 W, cooler, +3.0 pp | | [Gamko New Energy GKA210N120-665](https://comparepv.com/panel/gamko-new-energy-gka210n120-665) | 665 W | +80 W, lighter, +3.0 pp | | [Sunpro Power SPDG660-N120M12](https://comparepv.com/panel/sunpro-spdg660-n120m12) | 660 W | +75 W, cooler, +2.8 pp | --- Source: https://comparepv.com/panel/waaree-bi-66-585 Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.