--- title: "Canadian Solar CS6.2-54TM-510 vs Canadian Solar CS6.2-66TM-615 - Solar Panel Comparison | ComparePV" description: "Compare Canadian Solar CS6.2-54TM-510 vs Canadian Solar CS6.2-66TM-615 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-cs6-2-54tm-510/csi-solar-co-ltd-canadian-solar-cs6-2-66tm-615" updated: 2026-09-11 --- # Canadian Solar CS6.2-54TM-510 vs Canadian Solar CS6.2-66TM-615 8 differences, and they point both ways The largest is rated power: 105 W more power. 11 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Canadian Solar CS6.2-54TM-510](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs6-2-54tm-510) | [Canadian Solar CS6.2-66TM-615](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs6-2-66tm-615) | | Manufacturer | Canadian Solar | Canadian Solar | | Power | 510 Wp | 615 Wp | | Efficiency | 22.90 % | 22.80 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 54TM-510 | 66TM-615 | Difference | | --- | --- | --- | --- | | Rated power | 510 Wp | 615 Wp | +105 W for 66TM-615 | | Weight | 23.3 kg | 28.1 kg | -4.8 kg for 54TM-510 | | Product warranty | 15 yrs | 12 yrs | +3 yrs for 54TM-510 | | Open-circuit voltage | 40.00 V | 48.20 V | 8.20 V apart | | Module area | 2.224 m² | 2.701 m² | 0.477 m² apart | | Voltage at max power | 33.80 V | 41.00 V | 7.20 V apart | | Cell count | 108 | 132 | 24 cells apart | | Dimensions | 1961x1134x30 mm | 2382x1134x30 mm | 1961x1134x30 mm vs 2382x1134x30 mm | ## Every compared parameter | Parameter | 54TM-510 | 66TM-615 | | --- | --- | --- | | Rated power | 510 Wp | 615 Wp | | Module efficiency | 22.90 % | 22.80 % | | Power density | 229.3 Wp/m² | 227.7 Wp/m² | | Open-circuit voltage | 40.00 V | 48.20 V | | Voltage at max power | 33.80 V | 41.00 V | | Short-circuit current | 16.10 A | 16.02 A | | Current at max power | 15.10 A | 15.01 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 1961x1134x30 mm | 2382x1134x30 mm | | Module area | 2.224 m² | 2.701 m² | | Weight | 23.3 kg | 28.1 kg | | Weight per kWp | 45.7 kg/kWp | 45.7 kg/kWp | | Product warranty | 15 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 | 108 | 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 (-0.290 %/°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, 54TM-510:** 17,112 kWh - **Cumulative output, 66TM-615:** 20,634 kWh - **Gap:** 3,522 kWh ## Output when hot | Condition | Cell temperature | 54TM-510 | 66TM-615 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 510 W | 615 W | 100.0% of rated power | | Cool, bright day | 40 °C | 488 W | 588 W | 95.7% of rated power | | Typical summer roof | 55 °C | 466 W | 561 W | 91.3% of rated power | | Hot roof | 70 °C | 443 W | 535 W | 87.0% of rated power | ## Against the whole database | Measure | 54TM-510 | 66TM-615 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #2,359 | #2,714 | 14,005 | 54TM-510 leads by 355 places | | Power density | #2,343 | #3,077 | 14,005 | 54TM-510 leads by 734 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #836 | #844 | 14,005 | 54TM-510 leads by 8 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #5,595 | #2,792 | 14,005 | 66TM-615 leads by 2,803 places | ## Questions ### Which panel is better: Canadian Solar CS6.2-54TM-510 or Canadian Solar CS6.2-66TM-615? According to our database: **Canadian Solar CS6.2-54TM-510** has higher module efficiency (**22.90%** 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 CS6.2-54TM-510 and Canadian Solar CS6.2-66TM-615? **Canadian Solar CS6.2-54TM-510** has a module efficiency of **22.90%**, while **Canadian Solar CS6.2-66TM-615** is **22.80%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Canadian Solar CS6.2-54TM-510 use vs Canadian Solar CS6.2-66TM-615? **Canadian Solar CS6.2-54TM-510** uses **TOPCon** cells; **Canadian Solar CS6.2-66TM-615** 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 CS6.2-54TM-510 and Canadian Solar CS6.2-66TM-615? **Canadian Solar CS6.2-54TM-510** has a **30 years** power warranty; **Canadian Solar CS6.2-66TM-615** 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. ## Related comparisons - [Canadian Solar CS6.2-54TM-510 vs Canadian Solar CS6.2-66TM-635](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6-2-54tm-510/csi-solar-co-ltd-canadian-solar-cs6-2-66tm-635) - 10 differences, the largest is rated power - [Canadian Solar CS6.2-54TM-510 vs Canadian Solar CS6.2-66TM-630](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6-2-54tm-510/csi-solar-co-ltd-canadian-solar-cs6-2-66tm-630) - 10 differences, the largest is rated power - [Canadian Solar CS6.2-54TM-510 vs Canadian Solar CS6.2-66TM-625](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6-2-54tm-510/csi-solar-co-ltd-canadian-solar-cs6-2-66tm-625) - 9 differences, the largest is rated power - [Canadian Solar CS6.2-54TM-510 vs Canadian Solar CS6.2-66TM-620](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6-2-54tm-510/csi-solar-co-ltd-canadian-solar-cs6-2-66tm-620) - 8 differences, the largest is rated power - [Canadian Solar CS6.2-54TM-510 vs Canadian Solar CS6.2-66TM-610](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6-2-54tm-510/csi-solar-co-ltd-canadian-solar-cs6-2-66tm-610) - 10 differences, the largest is rated power - [Canadian Solar CS6.2-54TM-510 vs Canadian Solar CS6W-600T](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6-2-54tm-510/csi-solar-co-ltd-canadian-solar-cs6w-600t) - 11 differences, the largest is rated power --- Source: https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs6-2-54tm-510/csi-solar-co-ltd-canadian-solar-cs6-2-66tm-615 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.