--- title: "Waaree WSMD-655 vs Waaree WSMD-660 - Solar Panel Comparison | ComparePV" description: "Compare Waaree WSMD-655 vs Waaree WSMD-660 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/waaree-wsmd-655/waaree-wsmd-660" updated: 2026-09-11 --- # Waaree WSMD-655 vs Waaree WSMD-660 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 WSMD-655](https://comparepv.com/panel/waaree-wsmd-655) | [Waaree WSMD-660](https://comparepv.com/panel/waaree-wsmd-660) | | Manufacturer | Waaree | Waaree | | Power | 655 Wp | 660 Wp | | Efficiency | 20.99 % | 21.13 % | | Technology | PERC | PERC | ## Every compared parameter | Parameter | 655 | 660 | | --- | --- | --- | | Rated power | 655 Wp | 660 Wp | | Module efficiency | 20.99 % | 21.13 % | | Power density | 209.6 Wp/m² | 211.2 Wp/m² | | Open-circuit voltage | 46.26 V | 46.40 V | | Voltage at max power | 37.94 V | 38.06 V | | Short-circuit current | 17.90 A | 17.98 A | | Current at max power | 17.29 A | 17.35 A | | Temperature coefficient | -0.340 %/°C | -0.340 %/°C | | Dimensions | 2400x1302x35 mm | 2400x1302x35 mm | | Module area | 3.125 m² | 3.125 m² | | Weight | 34.5 kg | 34.5 kg | | Weight per kWp | 52.7 kg/kWp | 52.3 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 27 yrs | 27 yrs | | Annual degradation | 0.55 %/yr | 0.55 %/yr | | Cell technology | PERC | PERC | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | Bifacial | No | No | ## 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, 655:** 21,228 kWh - **Cumulative output, 660:** 21,390 kWh - **Gap:** 162 kWh ## Output when hot | Condition | Cell temperature | 655 | 660 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 655 W | 660 W | 100.0% of rated power | | Cool, bright day | 40 °C | 622 W | 626 W | 94.9% of rated power | | Typical summer roof | 55 °C | 588 W | 593 W | 89.8% of rated power | | Hot roof | 70 °C | 555 W | 559 W | 84.7% of rated power | ## Against the whole database | Measure | 655 | 660 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #9,944 | #9,239 | 14,005 | 660 leads by 705 places | | Power density | #9,923 | #9,251 | 14,005 | 660 leads by 672 places | | Heat behaviour | #8,778 | #8,778 | 14,005 | Tied - the same position in the database | | Weight | #6,295 | #5,732 | 14,005 | 660 leads by 563 places | | Warranty | #9,667 | #9,667 | 14,005 | Tied - the same position in the database | | Overall | #4,206 | #3,874 | 14,005 | 660 leads by 332 places | ## Questions ### Which panel is better: Waaree WSMD-655 or Waaree WSMD-660? According to our database: **Waaree WSMD-660** has higher module efficiency (**21.13%** vs **20.99%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Waaree WSMD-655 and Waaree WSMD-660? **Waaree WSMD-655** has a module efficiency of **20.99%**, while **Waaree WSMD-660** is **21.13%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Waaree WSMD-655 use vs Waaree WSMD-660? **Waaree WSMD-655** uses **PERC** cells; **Waaree WSMD-660** 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 WSMD-655 and Waaree WSMD-660? **Waaree WSMD-655** has a **27 years** power warranty; **Waaree WSMD-660** has a **27 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. ## Related comparisons - [Waaree WSMD-655 vs Waaree WSMD-665](https://comparepv.com/compare/waaree-wsmd-655/waaree-wsmd-665) - 3 differences, the largest is module efficiency - [Waaree WSMD-655 vs Waaree WSMD-650](https://comparepv.com/compare/waaree-wsmd-655/waaree-wsmd-650) - The same specification on paper - [Waaree WSMD-655 vs Waaree WSMD-645](https://comparepv.com/compare/waaree-wsmd-655/waaree-wsmd-645) - 3 differences, the largest is module efficiency - [Waaree WSMD-655 vs Waaree WSMD-545](https://comparepv.com/compare/waaree-wsmd-655/waaree-wsmd-545) - 11 differences, the largest is rated power - [Waaree WSMD-655 vs Waaree WSMD-540](https://comparepv.com/compare/waaree-wsmd-655/waaree-wsmd-540) - 10 differences, the largest is rated power - [Waaree WSMD-655 vs Waaree WSMD-535](https://comparepv.com/compare/waaree-wsmd-655/waaree-wsmd-535) - 11 differences, the largest is rated power --- Source: https://comparepv.com/compare/waaree-wsmd-655/waaree-wsmd-660 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.