--- title: "Waaree Bi-66-585 vs Waaree Bi-66-595 - Solar Panel Comparison | ComparePV" description: "Compare Waaree Bi-66-585 vs Waaree Bi-66-595 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-66-585/waaree-bi-66-595" updated: 2026-09-11 --- # Waaree Bi-66-585 vs Waaree Bi-66-595 595 leads on the differences that matter The largest is module efficiency: 0.36 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Waaree Bi-66-585](https://comparepv.com/panel/waaree-bi-66-585) | [Waaree Bi-66-595](https://comparepv.com/panel/waaree-bi-66-595) | | Manufacturer | Waaree | Waaree | | Power | 585 Wp | 595 Wp | | Efficiency | 20.52 % | 20.88 % | | Technology | PERC | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 585 | 595 | Difference | | --- | --- | --- | --- | | Module efficiency | 20.52 % | 20.88 % | +0.36 pp for 595 | | Power density | 205.2 Wp/m² | 208.7 Wp/m² | +3.5 Wp/m² for 595 | | Rated power | 585 Wp | 595 Wp | +10 W for 595 | ## Every compared parameter | Parameter | 585 | 595 | | --- | --- | --- | | Rated power | 585 Wp | 595 Wp | | Module efficiency | 20.52 % | 20.88 % | | Power density | 205.2 Wp/m² | 208.7 Wp/m² | | Open-circuit voltage | 41.76 V | 42.05 V | | Voltage at max power | 34.34 V | 34.44 V | | Short-circuit current | 17.78 A | 17.90 A | | Current at max power | 17.04 A | 17.29 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 | 60.7 kg/kWp | 59.7 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, 585:** 18,959 kWh - **Cumulative output, 595:** 19,283 kWh - **Gap:** 324 kWh ## Output when hot | Condition | Cell temperature | 585 | 595 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 585 W | 595 W | 100.0% of rated power | | Cool, bright day | 40 °C | 555 W | 565 W | 94.9% of rated power | | Typical summer roof | 55 °C | 525 W | 534 W | 89.8% of rated power | | Hot roof | 70 °C | 495 W | 504 W | 84.7% of rated power | ## Against the whole database | Measure | 585 | 595 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #11,244 | #10,320 | 14,005 | 595 leads by 924 places | | Power density | #11,293 | #10,302 | 14,005 | 595 leads by 991 places | | Heat behaviour | #8,778 | #8,778 | 14,005 | Tied - the same position in the database | | Weight | #12,517 | #12,231 | 14,005 | 595 leads by 286 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #6,692 | #5,833 | 14,005 | 595 leads by 859 places | ## Questions ### Which panel is better: Waaree Bi-66-585 or Waaree Bi-66-595? According to our database: **Waaree Bi-66-595** has higher module efficiency (**20.88%** vs **20.52%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Waaree Bi-66-585 and Waaree Bi-66-595? **Waaree Bi-66-585** has a module efficiency of **20.52%**, while **Waaree Bi-66-595** is **20.88%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Waaree Bi-66-585 use vs Waaree Bi-66-595? **Waaree Bi-66-585** uses **PERC** cells; **Waaree Bi-66-595** 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-66-585 and Waaree Bi-66-595? **Waaree Bi-66-585** has a **30 years** power warranty; **Waaree Bi-66-595** 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-66-585 and Waaree Bi-66-595 bifacial panels? Both **Waaree Bi-66-585** and **Waaree Bi-66-595** 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-66-585 vs Waaree Bi-68-665](https://comparepv.com/compare/waaree-bi-66-585/waaree-bi-68-665) - 10 differences, the largest is module efficiency - [Waaree Bi-66-585 vs Waaree Bi-68-660](https://comparepv.com/compare/waaree-bi-66-585/waaree-bi-68-660) - 9 differences, the largest is rated power - [Waaree Bi-66-585 vs Waaree Bi-68-655](https://comparepv.com/compare/waaree-bi-66-585/waaree-bi-68-655) - 9 differences, the largest is rated power - [Waaree Bi-66-585 vs Waaree Bi-68-650](https://comparepv.com/compare/waaree-bi-66-585/waaree-bi-68-650) - 8 differences, the largest is rated power - [Waaree Bi-66-585 vs Waaree Bi-68-645](https://comparepv.com/compare/waaree-bi-66-585/waaree-bi-68-645) - 7 differences, the largest is rated power - [Waaree Bi-66-585 vs Waaree Bi-66-600](https://comparepv.com/compare/waaree-bi-66-585/waaree-bi-66-600) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/waaree-bi-66-585/waaree-bi-66-595 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.