--- title: "Waaree WSMD-545 vs Waaree WSMD-645 - Solar Panel Comparison | ComparePV" description: "Compare Waaree WSMD-545 vs Waaree WSMD-645 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-545/waaree-wsmd-645" updated: 2026-09-11 --- # Waaree WSMD-545 vs Waaree WSMD-645 545 leads on the differences that matter The largest is rated power: 100 W more power. 6 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Waaree WSMD-545](https://comparepv.com/panel/waaree-wsmd-545) | [Waaree WSMD-645](https://comparepv.com/panel/waaree-wsmd-645) | | Manufacturer | Waaree | Waaree | | Power | 545 Wp | 645 Wp | | Efficiency | 21.17 % | 20.65 % | | Technology | PERC | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 545 | 645 | Difference | | --- | --- | --- | --- | | Rated power | 545 Wp | 645 Wp | +100 W for 645 | | Module efficiency | 21.17 % | 20.65 % | +0.52 pp for 545 | | Weight | 27.5 kg | 34.5 kg | -7.0 kg for 545 | | Short-circuit current | 13.90 A | 17.78 A | 3.88 A apart | | Module area | 2.574 m² | 3.125 m² | 0.551 m² apart | | Open-circuit voltage | 49.76 V | 45.94 V | 3.82 V apart | | Power density | 211.7 Wp/m² | 206.4 Wp/m² | +5.3 Wp/m² for 545 | | Temperature coefficient | -0.350 %/°C | -0.340 %/°C | +0.010 %/°C for 645 | | Weight per kWp | 50.5 kg/kWp | 53.5 kg/kWp | -3.0 kg/kWp for 545 | | Voltage at max power | 41.90 V | 37.87 V | 4.03 V apart | | Current at max power | 13.02 A | 17.04 A | 4.02 A apart | | Cell count | 144 | 132 | 12 cells apart | | Dimensions | 2272x1133x35 mm | 2400x1302x35 mm | 2272x1133x35 mm vs 2400x1302x35 mm | ## Every compared parameter | Parameter | 545 | 645 | | --- | --- | --- | | Rated power | 545 Wp | 645 Wp | | Module efficiency | 21.17 % | 20.65 % | | Power density | 211.7 Wp/m² | 206.4 Wp/m² | | Open-circuit voltage | 49.76 V | 45.94 V | | Voltage at max power | 41.90 V | 37.87 V | | Short-circuit current | 13.90 A | 17.78 A | | Current at max power | 13.02 A | 17.04 A | | Temperature coefficient | -0.350 %/°C | -0.340 %/°C | | Dimensions | 2272x1133x35 mm | 2400x1302x35 mm | | Module area | 2.574 m² | 3.125 m² | | Weight | 27.5 kg | 34.5 kg | | Weight per kWp | 50.5 kg/kWp | 53.5 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 | 144 | 132 | | Bifacial | No | No | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year - **Cumulative output, 545:** 17,663 kWh - **Cumulative output, 645:** 20,904 kWh - **Gap:** 3,241 kWh ## Output when hot | Condition | Cell temperature | 545 | 645 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 545 W | 645 W | 100.0% of rated power | | Cool, bright day | 40 °C | 516 W | 612 W | 94.8% of rated power | | Typical summer roof | 55 °C | 488 W | 579 W | 89.5% of rated power | | Hot roof | 70 °C | 459 W | 546 W | 84.2% of rated power | ## Against the whole database | Measure | 545 | 645 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #9,219 | #11,014 | 14,005 | 545 leads by 1,795 places | | Power density | #9,168 | #11,023 | 14,005 | 545 leads by 1,855 places | | Heat behaviour | #10,419 | #8,778 | 14,005 | 645 leads by 1,641 places | | Weight | #3,832 | #7,451 | 14,005 | 545 leads by 3,619 places | | Warranty | #9,667 | #9,667 | 14,005 | Tied - the same position in the database | | Overall | #7,908 | #4,962 | 14,005 | 645 leads by 2,946 places | ## Questions ### Which panel is better: Waaree WSMD-545 or Waaree WSMD-645? According to our database: **Waaree WSMD-545** has higher module efficiency (**21.17%** vs **20.65%**); **Waaree WSMD-645** tolerates heat better (temp coeff **-0.340%/°C** vs **-0.350%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Waaree WSMD-545 and Waaree WSMD-645? **Waaree WSMD-545** has a module efficiency of **21.17%**, while **Waaree WSMD-645** is **20.65%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Waaree WSMD-545 use vs Waaree WSMD-645? **Waaree WSMD-545** uses **PERC** cells; **Waaree WSMD-645** 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-545 and Waaree WSMD-645? **Waaree WSMD-545** has a **27 years** power warranty; **Waaree WSMD-645** 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-545 vs Waaree WSMD-665](https://comparepv.com/compare/waaree-wsmd-545/waaree-wsmd-665) - 10 differences, the largest is rated power - [Waaree WSMD-545 vs Waaree WSMD-660](https://comparepv.com/compare/waaree-wsmd-545/waaree-wsmd-660) - 10 differences, the largest is rated power - [Waaree WSMD-545 vs Waaree WSMD-655](https://comparepv.com/compare/waaree-wsmd-545/waaree-wsmd-655) - 11 differences, the largest is rated power - [Waaree WSMD-545 vs Waaree WSMD-650](https://comparepv.com/compare/waaree-wsmd-545/waaree-wsmd-650) - 13 differences, the largest is rated power - [Waaree WSMD-545 vs Waaree WSMD-540](https://comparepv.com/compare/waaree-wsmd-545/waaree-wsmd-540) - The same specification on paper - [Waaree WSMD-545 vs Waaree WSMD-535](https://comparepv.com/compare/waaree-wsmd-545/waaree-wsmd-535) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/waaree-wsmd-545/waaree-wsmd-645 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.