--- title: "Waaree Bi-68-660 vs Waaree Bi-68-665 - Solar Panel Comparison | ComparePV" description: "Compare Waaree Bi-68-660 vs Waaree Bi-68-665 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/waaree-bi-68-660/waaree-bi-68-665" updated: 2026-09-11 --- # Waaree Bi-68-660 vs Waaree Bi-68-665 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 Bi-68-660](https://comparepv.com/panel/waaree-bi-68-660) | [Waaree Bi-68-665](https://comparepv.com/panel/waaree-bi-68-665) | | Manufacturer | Waaree | Waaree | | Power | 660 Wp | 665 Wp | | Efficiency | 21.13 % | 21.29 % | | Technology | PERC | PERC | ## Every compared parameter | Parameter | 660 | 665 | | --- | --- | --- | | Rated power | 660 Wp | 665 Wp | | Module efficiency | 21.13 % | 21.29 % | | Power density | 211.2 Wp/m² | 212.8 Wp/m² | | Open-circuit voltage | 46.40 V | 46.58 V | | Voltage at max power | 38.06 V | 38.10 V | | Short-circuit current | 17.98 A | 18.03 A | | Current at max power | 17.35 A | 17.46 A | | Temperature coefficient | -0.340 %/°C | -0.340 %/°C | | Dimensions | 2400x1302x35 mm | 2400x1302x35 mm | | Module area | 3.125 m² | 3.125 m² | | Weight | 39.0 kg | 39.0 kg | | Weight per kWp | 59.1 kg/kWp | 58.6 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.55 %/yr | 0.55 %/yr | | Cell technology | PERC | PERC | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | Bifacial | Yes | Yes | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.340 %/°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, 660:** 21,390 kWh - **Cumulative output, 665:** 21,552 kWh - **Gap:** 162 kWh ## Output when hot | Condition | Cell temperature | 660 | 665 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 660 W | 665 W | 100.0% of rated power | | Cool, bright day | 40 °C | 626 W | 631 W | 94.9% of rated power | | Typical summer roof | 55 °C | 593 W | 597 W | 89.8% of rated power | | Hot roof | 70 °C | 559 W | 563 W | 84.7% of rated power | ## Against the whole database | Measure | 660 | 665 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #9,239 | #8,708 | 14,005 | 665 leads by 531 places | | Power density | #9,251 | #8,707 | 14,005 | 665 leads by 544 places | | Heat behaviour | #8,778 | #8,778 | 14,005 | Tied - the same position in the database | | Weight | #12,010 | #11,826 | 14,005 | 665 leads by 184 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #3,318 | #2,941 | 14,005 | 665 leads by 377 places | ## Questions ### Which panel is better: Waaree Bi-68-660 or Waaree Bi-68-665? According to our database: **Waaree Bi-68-665** has higher module efficiency (**21.29%** vs **21.13%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Waaree Bi-68-660 and Waaree Bi-68-665? **Waaree Bi-68-660** has a module efficiency of **21.13%**, while **Waaree Bi-68-665** is **21.29%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Waaree Bi-68-660 use vs Waaree Bi-68-665? **Waaree Bi-68-660** uses **PERC** cells; **Waaree Bi-68-665** uses **PERC**. 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 Bi-68-660 and Waaree Bi-68-665? **Waaree Bi-68-660** has a **30 years** power warranty; **Waaree Bi-68-665** 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 Bi-68-660 and Waaree Bi-68-665 bifacial panels? Both **Waaree Bi-68-660** and **Waaree Bi-68-665** 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 Bi-68-660 vs Waaree Bi-68-655](https://comparepv.com/compare/waaree-bi-68-660/waaree-bi-68-655) - The same specification on paper - [Waaree Bi-68-660 vs Waaree Bi-68-650](https://comparepv.com/compare/waaree-bi-68-660/waaree-bi-68-650) - 3 differences, the largest is module efficiency - [Waaree Bi-68-660 vs Waaree Bi-68-645](https://comparepv.com/compare/waaree-bi-68-660/waaree-bi-68-645) - 3 differences, the largest is module efficiency - [Waaree Bi-68-660 vs Waaree Bi-66-600](https://comparepv.com/compare/waaree-bi-68-660/waaree-bi-66-600) - 7 differences, the largest is rated power - [Waaree Bi-68-660 vs Waaree Bi-66-595](https://comparepv.com/compare/waaree-bi-68-660/waaree-bi-66-595) - 8 differences, the largest is rated power - [Waaree Bi-68-660 vs Waaree Bi-66-590](https://comparepv.com/compare/waaree-bi-68-660/waaree-bi-66-590) - 9 differences, the largest is rated power --- Source: https://comparepv.com/compare/waaree-bi-68-660/waaree-bi-68-665 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.