--- title: "Waaree BiN-21-615 vs Waaree BiN-21-635 - Solar Panel Comparison | ComparePV" description: "Compare Waaree BiN-21-615 vs Waaree BiN-21-635 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/waaree-bin-21-615/waaree-bin-21-635" updated: 2026-09-11 --- # Waaree BiN-21-615 vs Waaree BiN-21-635 635 leads on the differences that matter The largest is module efficiency: 0.74 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Waaree BiN-21-615](https://comparepv.com/panel/waaree-bin-21-615) | [Waaree BiN-21-635](https://comparepv.com/panel/waaree-bin-21-635) | | Manufacturer | Waaree | Waaree | | Power | 615 Wp | 635 Wp | | Efficiency | 22.77 % | 23.51 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 615 | 635 | Difference | | --- | --- | --- | --- | | Module efficiency | 22.77 % | 23.51 % | +0.74 pp for 635 | | Power density | 227.7 Wp/m² | 235.1 Wp/m² | +7.4 Wp/m² for 635 | | Rated power | 615 Wp | 635 Wp | +20 W for 635 | ## Every compared parameter | Parameter | 615 | 635 | | --- | --- | --- | | Rated power | 615 Wp | 635 Wp | | Module efficiency | 22.77 % | 23.51 % | | Power density | 227.7 Wp/m² | 235.1 Wp/m² | | Open-circuit voltage | 48.90 V | 49.70 V | | Voltage at max power | 41.14 V | 41.91 V | | Short-circuit current | 15.97 A | 16.17 A | | Current at max power | 14.95 A | 15.15 A | | Temperature coefficient | -0.300 %/°C | -0.300 %/°C | | Dimensions | 2382x1134x35 mm | 2382x1134x35 mm | | Module area | 2.701 m² | 2.701 m² | | Weight | 33.8 kg | 33.8 kg | | Weight per kWp | 55.0 kg/kWp | 53.2 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | Bifacial | Yes | Yes | ## Thirty-year yield Declared annual degradation, with a 1.0% first-year loss assumed for both panels because at least one datasheet omits it, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.300 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other. - **Cumulative output, 615:** 20,634 kWh - **Cumulative output, 635:** 21,306 kWh - **Gap:** 672 kWh ## Output when hot | Condition | Cell temperature | 615 | 635 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 615 W | 635 W | 100.0% of rated power | | Cool, bright day | 40 °C | 587 W | 606 W | 95.5% of rated power | | Typical summer roof | 55 °C | 560 W | 578 W | 91.0% of rated power | | Hot roof | 70 °C | 532 W | 549 W | 86.5% of rated power | ## Against the whole database | Measure | 615 | 635 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,037 | #688 | 13,953 | 635 leads by 2,349 places | | Power density | #3,039 | #731 | 13,953 | 635 leads by 2,308 places | | Heat behaviour | #6,051 | #6,051 | 13,953 | Tied - the same position in the database | | Weight | #9,296 | #7,029 | 13,953 | 635 leads by 2,267 places | | Warranty | #21 | #21 | 13,953 | Tied - the same position in the database | | Overall | #2,913 | #1,743 | 13,953 | 635 leads by 1,170 places | ## Questions ### Which panel is better: Waaree BiN-21-615 or Waaree BiN-21-635? According to our database: **Waaree BiN-21-635** has higher module efficiency (**23.51%** vs **22.77%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Waaree BiN-21-615 and Waaree BiN-21-635? **Waaree BiN-21-615** has a module efficiency of **22.77%**, while **Waaree BiN-21-635** is **23.51%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Waaree BiN-21-615 use vs Waaree BiN-21-635? **Waaree BiN-21-615** uses **TOPCon** cells; **Waaree BiN-21-635** uses **TOPCon**. Modern **n-type** technologies (**TOPCon**, **HJT**, BC) typically deliver higher efficiency and lower degradation compared to older **PERC** (p-type) cells. ### What is the warranty on Waaree BiN-21-615 and Waaree BiN-21-635? **Waaree BiN-21-615** has a **30 years** power warranty; **Waaree BiN-21-635** has a **30 years** power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80**-87%**). Product (materials) warranties are usually shorter. ### Are Waaree BiN-21-615 and Waaree BiN-21-635 bifacial panels? Both **Waaree BiN-21-615** and **Waaree BiN-21-635** are bifacial - they capture reflected light from the ground, which can add 5**-15%** more annual energy on ground-mount or elevated rooftop installations with a light surface beneath. ## Related comparisons - [Waaree BiN-21-615 vs Waaree BiN-21-630](https://comparepv.com/compare/waaree-bin-21-615/waaree-bin-21-630) - 3 differences, the largest is module efficiency - [Waaree BiN-21-615 vs Waaree BiN-21-625](https://comparepv.com/compare/waaree-bin-21-615/waaree-bin-21-625) - 3 differences, the largest is module efficiency - [Waaree BiN-21-615 vs Waaree BiN-21-620](https://comparepv.com/compare/waaree-bin-21-615/waaree-bin-21-620) - The same specification on paper - [Waaree BiN-21-615 vs Waaree BiN-21-610](https://comparepv.com/compare/waaree-bin-21-615/waaree-bin-21-610) - The same specification on paper - [Waaree BiN-21-615 vs Waaree BiN-21-605](https://comparepv.com/compare/waaree-bin-21-615/waaree-bin-21-605) - 3 differences, the largest is module efficiency - [Waaree BiN-21-615 vs Waaree BiN-21-600](https://comparepv.com/compare/waaree-bin-21-615/waaree-bin-21-600) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/waaree-bin-21-615/waaree-bin-21-635 Not in this file, on the page: the thirty-year yield curve year by year at a cell temperature you pick and a written summary generated on request.