--- title: "Waaree Bi-66-580 vs Waaree Bi-66-600 - Solar Panel Comparison | ComparePV" description: "Compare Waaree Bi-66-580 vs Waaree Bi-66-600 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-66-580/waaree-bi-66-600" updated: 2026-09-11 --- # Waaree Bi-66-580 vs Waaree Bi-66-600 600 leads on the differences that matter The largest is module efficiency: 0.71 pp more efficient. 15 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Waaree Bi-66-580](https://comparepv.com/panel/waaree-bi-66-580) | [Waaree Bi-66-600](https://comparepv.com/panel/waaree-bi-66-600) | | Manufacturer | Waaree | Waaree | | Power | 580 Wp | 600 Wp | | Efficiency | 20.35 % | 21.06 % | | Technology | PERC | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 580 | 600 | Difference | | --- | --- | --- | --- | | Module efficiency | 20.35 % | 21.06 % | +0.71 pp for 600 | | Power density | 203.4 Wp/m² | 210.4 Wp/m² | +7.0 Wp/m² for 600 | | Rated power | 580 Wp | 600 Wp | +20 W for 600 | | Weight per kWp | 61.2 kg/kWp | 59.2 kg/kWp | -2.0 kg/kWp for 600 | ## Every compared parameter | Parameter | 580 | 600 | | --- | --- | --- | | Rated power | 580 Wp | 600 Wp | | Module efficiency | 20.35 % | 21.06 % | | Power density | 203.4 Wp/m² | 210.4 Wp/m² | | Open-circuit voltage | 41.56 V | 42.18 V | | Voltage at max power | 34.21 V | 34.62 V | | Short-circuit current | 17.73 A | 17.98 A | | Current at max power | 16.96 A | 17.35 A | | Temperature coefficient | -0.340 %/°C | -0.340 %/°C | | Dimensions | 2190x1302x35 mm | 2190x1302x35 mm | | Module area | 2.851 m² | 2.851 m² | | Weight | 35.5 kg | 35.5 kg | | Weight per kWp | 61.2 kg/kWp | 59.2 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 | 120 | | 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, 580:** 18,797 kWh - **Cumulative output, 600:** 19,445 kWh - **Gap:** 648 kWh ## Output when hot | Condition | Cell temperature | 580 | 600 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 580 W | 600 W | 100.0% of rated power | | Cool, bright day | 40 °C | 550 W | 569 W | 94.9% of rated power | | Typical summer roof | 55 °C | 521 W | 539 W | 89.8% of rated power | | Hot roof | 70 °C | 491 W | 508 W | 84.7% of rated power | ## Against the whole database | Measure | 580 | 600 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #11,718 | #9,625 | 14,005 | 600 leads by 2,093 places | | Power density | #11,699 | #9,633 | 14,005 | 600 leads by 2,066 places | | Heat behaviour | #8,778 | #8,778 | 14,005 | Tied - the same position in the database | | Weight | #12,612 | #12,042 | 14,005 | 600 leads by 570 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #7,089 | #5,464 | 14,005 | 600 leads by 1,625 places | ## Questions ### Which panel is better: Waaree Bi-66-580 or Waaree Bi-66-600? According to our database: **Waaree Bi-66-600** has higher module efficiency (**21.06%** vs **20.35%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Waaree Bi-66-580 and Waaree Bi-66-600? **Waaree Bi-66-580** has a module efficiency of **20.35%**, while **Waaree Bi-66-600** is **21.06%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Waaree Bi-66-580 use vs Waaree Bi-66-600? **Waaree Bi-66-580** uses **PERC** cells; **Waaree Bi-66-600** 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-66-580 and Waaree Bi-66-600? **Waaree Bi-66-580** has a **30 years** power warranty; **Waaree Bi-66-600** 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-66-580 and Waaree Bi-66-600 bifacial panels? Both **Waaree Bi-66-580** and **Waaree Bi-66-600** 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-66-580 vs Waaree Bi-68-665](https://comparepv.com/compare/waaree-bi-66-580/waaree-bi-68-665) - 11 differences, the largest is module efficiency - [Waaree Bi-66-580 vs Waaree Bi-68-660](https://comparepv.com/compare/waaree-bi-66-580/waaree-bi-68-660) - 10 differences, the largest is module efficiency - [Waaree Bi-66-580 vs Waaree Bi-68-655](https://comparepv.com/compare/waaree-bi-66-580/waaree-bi-68-655) - 9 differences, the largest is rated power - [Waaree Bi-66-580 vs Waaree Bi-68-650](https://comparepv.com/compare/waaree-bi-66-580/waaree-bi-68-650) - 9 differences, the largest is rated power - [Waaree Bi-66-580 vs Waaree Bi-68-645](https://comparepv.com/compare/waaree-bi-66-580/waaree-bi-68-645) - 9 differences, the largest is rated power - [Waaree Bi-66-580 vs Waaree Bi-66-595](https://comparepv.com/compare/waaree-bi-66-580/waaree-bi-66-595) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/waaree-bi-66-580/waaree-bi-66-600 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.