--- title: "Canadian Solar CS6.2-48TD-455 vs Canadian Solar CS6.2-66TM-635 - Solar Panel Comparison | ComparePV" description: "Compare Canadian Solar CS6.2-48TD-455 vs Canadian Solar CS6.2-66TM-635 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6-2-48td-455/csi-solar-co-ltd-canadian-solar-cs6-2-66tm-635" updated: 2026-09-11 --- # Canadian Solar CS6.2-48TD-455 vs Canadian Solar CS6.2-66TM-635 66TM-635 leads on the differences that matter The largest is module efficiency: 0.70 pp more efficient. 5 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Canadian Solar CS6.2-48TD-455](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs6-2-48td-455) | [Canadian Solar CS6.2-66TM-635](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs6-2-66tm-635) | | Manufacturer | Canadian Solar | Canadian Solar | | Power | 455 Wp | 635 Wp | | Efficiency | 22.80 % | 23.50 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 48TD-455 | 66TM-635 | Difference | | --- | --- | --- | --- | | Module efficiency | 22.80 % | 23.50 % | +0.70 pp for 66TM-635 | | Rated power | 455 Wp | 635 Wp | +180 W for 66TM-635 | | Weight per kWp | 54.1 kg/kWp | 44.3 kg/kWp | -9.8 kg/kWp for 66TM-635 | | Product warranty | 25 yrs | 12 yrs | +13 yrs for 48TD-455 | | Weight | 24.6 kg | 28.1 kg | -3.5 kg for 48TD-455 | | Power density | 227.7 Wp/m² | 235.1 Wp/m² | +7.4 Wp/m² for 66TM-635 | | Short-circuit current | 10.75 A | 16.22 A | 5.47 A apart | | Module area | 1.998 m² | 2.701 m² | 0.703 m² apart | | Open-circuit voltage | 53.10 V | 49.40 V | 3.70 V apart | | Current at max power | 10.12 A | 15.18 A | 5.06 A apart | | Cell count | 144 | 132 | 12 cells apart | | Voltage at max power | 45.00 V | 41.90 V | 3.10 V apart | | Bifacial | Yes | No | Yes vs No | | Dimensions | 1762x1134x30 mm | 2382x1134x30 mm | 1762x1134x30 mm vs 2382x1134x30 mm | ## Every compared parameter | Parameter | 48TD-455 | 66TM-635 | | --- | --- | --- | | Rated power | 455 Wp | 635 Wp | | Module efficiency | 22.80 % | 23.50 % | | Power density | 227.7 Wp/m² | 235.1 Wp/m² | | Open-circuit voltage | 53.10 V | 49.40 V | | Voltage at max power | 45.00 V | 41.90 V | | Short-circuit current | 10.75 A | 16.22 A | | Current at max power | 10.12 A | 15.18 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 1762x1134x30 mm | 2382x1134x30 mm | | Module area | 1.998 m² | 2.701 m² | | Weight | 24.6 kg | 28.1 kg | | Weight per kWp | 54.1 kg/kWp | 44.3 kg/kWp | | Product warranty | 25 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 144 | 132 | | Bifacial | Yes | No | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.290 %/°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, 48TD-455:** 15,266 kWh - **Cumulative output, 66TM-635:** 21,306 kWh - **Gap:** 6,040 kWh ## Output when hot | Condition | Cell temperature | 48TD-455 | 66TM-635 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 455 W | 635 W | 100.0% of rated power | | Cool, bright day | 40 °C | 435 W | 607 W | 95.7% of rated power | | Typical summer roof | 55 °C | 415 W | 580 W | 91.3% of rated power | | Hot roof | 70 °C | 396 W | 552 W | 87.0% of rated power | ## Against the whole database | Measure | 48TD-455 | 66TM-635 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #2,714 | #716 | 14,005 | 66TM-635 leads by 1,998 places | | Power density | #2,888 | #741 | 14,005 | 66TM-635 leads by 2,147 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #8,287 | #408 | 14,005 | 66TM-635 leads by 7,879 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #5,669 | #1,683 | 14,005 | 66TM-635 leads by 3,986 places | ## Questions ### Which panel is better: Canadian Solar CS6.2-48TD-455 or Canadian Solar CS6.2-66TM-635? According to our database: **Canadian Solar CS6.2-66TM-635** has higher module efficiency (**23.50%** vs **22.80%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Canadian Solar CS6.2-48TD-455 and Canadian Solar CS6.2-66TM-635? **Canadian Solar CS6.2-48TD-455** has a module efficiency of **22.80%**, while **Canadian Solar CS6.2-66TM-635** is **23.50%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Canadian Solar CS6.2-48TD-455 use vs Canadian Solar CS6.2-66TM-635? **Canadian Solar CS6.2-48TD-455** uses **TOPCon** cells; **Canadian Solar CS6.2-66TM-635** uses **TOPCon**. 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 Canadian Solar CS6.2-48TD-455 and Canadian Solar CS6.2-66TM-635? **Canadian Solar CS6.2-48TD-455** has a **30 years** power warranty; **Canadian Solar CS6.2-66TM-635** 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 Canadian Solar CS6.2-48TD-455 and Canadian Solar CS6.2-66TM-635 bifacial panels? **Canadian Solar CS6.2-48TD-455** is bifacial (captures light from both faces); **Canadian Solar CS6.2-66TM-635** is monofacial. Bifacial panels work best on ground mounts or raised structures with a light-coloured surface underneath. ## Related comparisons - [Canadian Solar CS6.2-48TD-455 vs Canadian Solar CS6.2-66TM-630](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6-2-48td-455/csi-solar-co-ltd-canadian-solar-cs6-2-66tm-630) - 14 differences, the largest is rated power - [Canadian Solar CS6.2-48TD-455 vs Canadian Solar CS6.2-66TM-625](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6-2-48td-455/csi-solar-co-ltd-canadian-solar-cs6-2-66tm-625) - 14 differences, the largest is rated power - [Canadian Solar CS6.2-48TD-455 vs Canadian Solar CS6.2-66TM-620](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6-2-48td-455/csi-solar-co-ltd-canadian-solar-cs6-2-66tm-620) - 13 differences, the largest is rated power - [Canadian Solar CS6.2-48TD-455 vs Canadian Solar CS6.2-66TM-615](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6-2-48td-455/csi-solar-co-ltd-canadian-solar-cs6-2-66tm-615) - 12 differences, the largest is rated power - [Canadian Solar CS6.2-48TD-455 vs Canadian Solar CS6.2-66TM-610](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6-2-48td-455/csi-solar-co-ltd-canadian-solar-cs6-2-66tm-610) - 13 differences, the largest is rated power - [Canadian Solar CS6.2-48TD-455 vs Canadian Solar CS6W-600T](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6-2-48td-455/csi-solar-co-ltd-canadian-solar-cs6w-600t) - 12 differences, the largest is rated power --- Source: https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6-2-48td-455/csi-solar-co-ltd-canadian-solar-cs6-2-66tm-635 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.