--- title: "Canadian Solar CS6L-455MS vs Canadian Solar CS7N-645MS - Solar Panel Comparison | ComparePV" description: "Compare Canadian Solar CS6L-455MS vs Canadian Solar CS7N-645MS 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-cs6l-455ms/csi-solar-co-ltd-canadian-solar-cs7n-645ms" updated: 2026-09-11 --- # Canadian Solar CS6L-455MS vs Canadian Solar CS7N-645MS 11 differences, and they point both ways The largest is rated power: 190 W more power. 8 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Canadian Solar CS6L-455MS](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs6l-455ms) | [Canadian Solar CS7N-645MS](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs7n-645ms) | | Manufacturer | Canadian Solar | Canadian Solar | | Power | 455 Wp | 645 Wp | | Efficiency | 21.10 % | 20.80 % | | Technology | PERC | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | CS6L-455MS | CS7N-645MS | Difference | | --- | --- | --- | --- | | Rated power | 455 Wp | 645 Wp | +190 W for CS7N-645MS | | Weight | 24.2 kg | 33.9 kg | -9.7 kg for CS6L-455MS | | Short-circuit current | 13.95 A | 18.35 A | 4.40 A apart | | Module area | 2.158 m² | 3.106 m² | 0.948 m² apart | | Module efficiency | 21.10 % | 20.80 % | +0.30 pp for CS6L-455MS | | Open-circuit voltage | 41.20 V | 44.80 V | 3.60 V apart | | Power density | 210.8 Wp/m² | 207.6 Wp/m² | +3.2 Wp/m² for CS6L-455MS | | Current at max power | 13.17 A | 17.11 A | 3.94 A apart | | Cell count | 120 | 132 | 12 cells apart | | Voltage at max power | 34.60 V | 37.70 V | 3.10 V apart | | Dimensions | 1903x1134x30 mm | 2384x1303x35 mm | 1903x1134x30 mm vs 2384x1303x35 mm | ## Every compared parameter | Parameter | CS6L-455MS | CS7N-645MS | | --- | --- | --- | | Rated power | 455 Wp | 645 Wp | | Module efficiency | 21.10 % | 20.80 % | | Power density | 210.8 Wp/m² | 207.6 Wp/m² | | Open-circuit voltage | 41.20 V | 44.80 V | | Voltage at max power | 34.60 V | 37.70 V | | Short-circuit current | 13.95 A | 18.35 A | | Current at max power | 13.17 A | 17.11 A | | Temperature coefficient | -0.340 %/°C | -0.340 %/°C | | Dimensions | 1903x1134x30 mm | 2384x1303x35 mm | | Module area | 2.158 m² | 3.106 m² | | Weight | 24.2 kg | 33.9 kg | | Weight per kWp | 53.2 kg/kWp | 52.6 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 25 yrs | 25 yrs | | Annual degradation | 0.55 %/yr | 0.55 %/yr | | Cell technology | PERC | PERC | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 120 | 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, CS6L-455MS:** 14,746 kWh - **Cumulative output, CS7N-645MS:** 20,904 kWh - **Gap:** 6,158 kWh ## Output when hot | Condition | Cell temperature | CS6L-455MS | CS7N-645MS | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 455 W | 645 W | 100.0% of rated power | | Cool, bright day | 40 °C | 432 W | 612 W | 94.9% of rated power | | Typical summer roof | 55 °C | 409 W | 579 W | 89.8% of rated power | | Hot roof | 70 °C | 385 W | 546 W | 84.7% of rated power | ## Against the whole database | Measure | CS6L-455MS | CS7N-645MS | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #9,297 | #10,457 | 14,005 | CS6L-455MS leads by 1,160 places | | Power density | #9,534 | #10,562 | 14,005 | CS6L-455MS leads by 1,028 places | | Heat behaviour | #8,778 | #8,778 | 14,005 | Tied - the same position in the database | | Weight | #7,011 | #6,185 | 14,005 | CS7N-645MS leads by 826 places | | Warranty | #9,798 | #9,798 | 14,005 | Tied - the same position in the database | | Overall | #10,780 | #5,161 | 14,005 | CS7N-645MS leads by 5,619 places | ## Questions ### Which panel is better: Canadian Solar CS6L-455MS or Canadian Solar CS7N-645MS? According to our database: **Canadian Solar CS6L-455MS** has higher module efficiency (**21.10%** vs **20.80%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Canadian Solar CS6L-455MS and Canadian Solar CS7N-645MS? **Canadian Solar CS6L-455MS** has a module efficiency of **21.10%**, while **Canadian Solar CS7N-645MS** is **20.80%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Canadian Solar CS6L-455MS use vs Canadian Solar CS7N-645MS? **Canadian Solar CS6L-455MS** uses **PERC** cells; **Canadian Solar CS7N-645MS** 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 Canadian Solar CS6L-455MS and Canadian Solar CS7N-645MS? **Canadian Solar CS6L-455MS** has a **25 years** power warranty; **Canadian Solar CS7N-645MS** has a **25 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 - [Canadian Solar CS6L-455MS vs Canadian Solar CS7N-675MS](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6l-455ms/csi-solar-co-ltd-canadian-solar-cs7n-675ms) - 12 differences, the largest is rated power - [Canadian Solar CS6L-455MS vs Canadian Solar CS7N-670MS](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6l-455ms/csi-solar-co-ltd-canadian-solar-cs7n-670ms) - 12 differences, the largest is rated power - [Canadian Solar CS6L-455MS vs Canadian Solar CS7N-665MS](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6l-455ms/csi-solar-co-ltd-canadian-solar-cs7n-665ms) - 12 differences, the largest is rated power - [Canadian Solar CS6L-455MS vs Canadian Solar CS7N-660MS](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6l-455ms/csi-solar-co-ltd-canadian-solar-cs7n-660ms) - 9 differences, the largest is rated power - [Canadian Solar CS6L-455MS vs Canadian Solar CS7N-655MS](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6l-455ms/csi-solar-co-ltd-canadian-solar-cs7n-655ms) - 9 differences, the largest is rated power - [Canadian Solar CS6L-455MS vs Canadian Solar CS7N-650MS](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6l-455ms/csi-solar-co-ltd-canadian-solar-cs7n-650ms) - 10 differences, the largest is rated power --- Source: https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6l-455ms/csi-solar-co-ltd-canadian-solar-cs7n-645ms 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.