--- title: "Waaree BiN-21-615 vs Waaree BiN-21-620 - Solar Panel Comparison | ComparePV" description: "Compare Waaree BiN-21-615 vs Waaree BiN-21-620 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-21-620" updated: 2026-09-11 --- # Waaree BiN-21-615 vs Waaree BiN-21-620 Identical on every published parameter All 19 comparable parameters agree. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Waaree BiN-21-615](https://comparepv.com/panel/waaree-bin-21-615) | [Waaree BiN-21-620](https://comparepv.com/panel/waaree-bin-21-620) | | Manufacturer | Waaree | Waaree | | Power | 615 Wp | 620 Wp | | Efficiency | 22.77 % | 22.95 % | | Technology | TOPCon | TOPCon | ## Every compared parameter | Parameter | 615 | 620 | | --- | --- | --- | | Rated power | 615 Wp | 620 Wp | | Module efficiency | 22.77 % | 22.95 % | | Power density | 227.7 Wp/m² | 229.5 Wp/m² | | Open-circuit voltage | 48.90 V | 49.10 V | | Voltage at max power | 41.14 V | 41.33 V | | Short-circuit current | 15.97 A | 16.02 A | | Current at max power | 14.95 A | 15.00 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 | 54.5 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, 620:** 20,802 kWh - **Gap:** 168 kWh ## Output when hot | Condition | Cell temperature | 615 | 620 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 615 W | 620 W | 100.0% of rated power | | Cool, bright day | 40 °C | 587 W | 592 W | 95.5% of rated power | | Typical summer roof | 55 °C | 560 W | 564 W | 91.0% of rated power | | Hot roof | 70 °C | 532 W | 536 W | 86.5% of rated power | ## Against the whole database | Measure | 615 | 620 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,037 | #2,241 | 13,953 | 620 leads by 796 places | | Power density | #3,039 | #2,164 | 13,953 | 620 leads by 875 places | | Heat behaviour | #6,051 | #6,051 | 13,953 | Tied - the same position in the database | | Weight | #9,296 | #8,800 | 13,953 | 620 leads by 496 places | | Warranty | #21 | #21 | 13,953 | Tied - the same position in the database | | Overall | #2,913 | #2,570 | 13,953 | 620 leads by 343 places | ## Questions ### Which panel is better: Waaree BiN-21-615 or Waaree BiN-21-620? According to our database: **Waaree BiN-21-620** has higher module efficiency (**22.95%** 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-21-620? **Waaree BiN-21-615** has a module efficiency of **22.77%**, while **Waaree BiN-21-620** is **22.95%**. 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-21-620? **Waaree BiN-21-615** uses **TOPCon** cells; **Waaree BiN-21-620** 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-21-620? **Waaree BiN-21-615** has a **30 years** power warranty; **Waaree BiN-21-620** 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-21-620 bifacial panels? Both **Waaree BiN-21-615** and **Waaree BiN-21-620** 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-21-635](https://comparepv.com/compare/waaree-bin-21-615/waaree-bin-21-635) - 3 differences, the largest is module efficiency - [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-21-610](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-21-620 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.