--- title: "Waaree Bi-66-600 vs Waaree Bi-68-665 - Solar Panel Comparison | ComparePV" description: "Compare Waaree Bi-66-600 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-66-600/waaree-bi-68-665" updated: 2026-09-11 --- # Waaree Bi-66-600 vs Waaree Bi-68-665 68-665 leads on the differences that matter The largest is rated power: 65 W more power. 11 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Waaree Bi-66-600](https://comparepv.com/panel/waaree-bi-66-600) | [Waaree Bi-68-665](https://comparepv.com/panel/waaree-bi-68-665) | | Manufacturer | Waaree | Waaree | | Power | 600 Wp | 665 Wp | | Efficiency | 21.06 % | 21.29 % | | Technology | PERC | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 66-600 | 68-665 | Difference | | --- | --- | --- | --- | | Rated power | 600 Wp | 665 Wp | +65 W for 68-665 | | Weight | 35.5 kg | 39.0 kg | -3.5 kg for 66-600 | | Open-circuit voltage | 42.18 V | 46.58 V | 4.40 V apart | | Module area | 2.851 m² | 3.125 m² | 0.273 m² apart | | Module efficiency | 21.06 % | 21.29 % | +0.23 pp for 68-665 | | Cell count | 120 | 132 | 12 cells apart | | Voltage at max power | 34.62 V | 38.10 V | 3.48 V apart | | Dimensions | 2190x1302x35 mm | 2400x1302x35 mm | 2190x1302x35 mm vs 2400x1302x35 mm | ## Every compared parameter | Parameter | 66-600 | 68-665 | | --- | --- | --- | | Rated power | 600 Wp | 665 Wp | | Module efficiency | 21.06 % | 21.29 % | | Power density | 210.4 Wp/m² | 212.8 Wp/m² | | Open-circuit voltage | 42.18 V | 46.58 V | | Voltage at max power | 34.62 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 | 2190x1302x35 mm | 2400x1302x35 mm | | Module area | 2.851 m² | 3.125 m² | | Weight | 35.5 kg | 39.0 kg | | Weight per kWp | 59.2 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 | 120 | 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, 66-600:** 19,445 kWh - **Cumulative output, 68-665:** 21,552 kWh - **Gap:** 2,107 kWh ## Output when hot | Condition | Cell temperature | 66-600 | 68-665 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 600 W | 665 W | 100.0% of rated power | | Cool, bright day | 40 °C | 569 W | 631 W | 94.9% of rated power | | Typical summer roof | 55 °C | 539 W | 597 W | 89.8% of rated power | | Hot roof | 70 °C | 508 W | 563 W | 84.7% of rated power | ## Against the whole database | Measure | 66-600 | 68-665 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #9,625 | #8,708 | 14,005 | 68-665 leads by 917 places | | Power density | #9,633 | #8,707 | 14,005 | 68-665 leads by 926 places | | Heat behaviour | #8,778 | #8,778 | 14,005 | Tied - the same position in the database | | Weight | #12,042 | #11,826 | 14,005 | 68-665 leads by 216 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #5,464 | #2,941 | 14,005 | 68-665 leads by 2,523 places | ## Questions ### Which panel is better: Waaree Bi-66-600 or Waaree Bi-68-665? According to our database: **Waaree Bi-68-665** has higher module efficiency (**21.29%** vs **21.06%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Waaree Bi-66-600 and Waaree Bi-68-665? **Waaree Bi-66-600** has a module efficiency of **21.06%**, 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-66-600 use vs Waaree Bi-68-665? **Waaree Bi-66-600** 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-66-600 and Waaree Bi-68-665? **Waaree Bi-66-600** 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-66-600 and Waaree Bi-68-665 bifacial panels? Both **Waaree Bi-66-600** 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-66-600 vs Waaree Bi-68-660](https://comparepv.com/compare/waaree-bi-66-600/waaree-bi-68-660) - 7 differences, the largest is rated power - [Waaree Bi-66-600 vs Waaree Bi-68-655](https://comparepv.com/compare/waaree-bi-66-600/waaree-bi-68-655) - 7 differences, the largest is rated power - [Waaree Bi-66-600 vs Waaree Bi-68-650](https://comparepv.com/compare/waaree-bi-66-600/waaree-bi-68-650) - 8 differences, the largest is rated power - [Waaree Bi-66-600 vs Waaree Bi-68-645](https://comparepv.com/compare/waaree-bi-66-600/waaree-bi-68-645) - 9 differences, the largest is rated power - [Waaree Bi-66-600 vs Waaree Bi-66-595](https://comparepv.com/compare/waaree-bi-66-600/waaree-bi-66-595) - The same specification on paper - [Waaree Bi-66-600 vs Waaree Bi-66-590](https://comparepv.com/compare/waaree-bi-66-600/waaree-bi-66-590) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/waaree-bi-66-600/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.