--- title: "Canadian Solar CS7N-645MS vs Canadian Solar CS7N-650MS - Solar Panel Comparison | ComparePV" description: "Compare Canadian Solar CS7N-645MS vs Canadian Solar CS7N-650MS 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-cs7n-645ms/csi-solar-co-ltd-canadian-solar-cs7n-650ms" updated: 2026-09-11 --- # Canadian Solar CS7N-645MS vs Canadian Solar CS7N-650MS 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 | [Canadian Solar CS7N-645MS](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs7n-645ms) | [Canadian Solar CS7N-650MS](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs7n-650ms) | | Manufacturer | Canadian Solar | Canadian Solar | | Power | 645 Wp | 650 Wp | | Efficiency | 20.80 % | 20.90 % | | Technology | PERC | PERC | ## Every compared parameter | Parameter | 645MS | 650MS | | --- | --- | --- | | Rated power | 645 Wp | 650 Wp | | Module efficiency | 20.80 % | 20.90 % | | Power density | 207.6 Wp/m² | 209.2 Wp/m² | | Open-circuit voltage | 44.80 V | 45.00 V | | Voltage at max power | 37.70 V | 37.90 V | | Short-circuit current | 18.35 A | 18.39 A | | Current at max power | 17.11 A | 17.16 A | | Temperature coefficient | -0.340 %/°C | -0.340 %/°C | | Dimensions | 2384x1303x35 mm | 2384x1303x35 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 33.9 kg | 33.9 kg | | Weight per kWp | 52.6 kg/kWp | 52.2 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 | 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, 645MS:** 20,904 kWh - **Cumulative output, 650MS:** 21,066 kWh - **Gap:** 162 kWh ## Output when hot | Condition | Cell temperature | 645MS | 650MS | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 645 W | 650 W | 100.0% of rated power | | Cool, bright day | 40 °C | 612 W | 617 W | 94.9% of rated power | | Typical summer roof | 55 °C | 579 W | 584 W | 89.8% of rated power | | Hot roof | 70 °C | 546 W | 551 W | 84.7% of rated power | ## Against the whole database | Measure | 645MS | 650MS | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #10,457 | #10,072 | 14,005 | 650MS leads by 385 places | | Power density | #10,562 | #10,011 | 14,005 | 650MS leads by 551 places | | Heat behaviour | #8,778 | #8,778 | 14,005 | Tied - the same position in the database | | Weight | #6,185 | #5,614 | 14,005 | 650MS leads by 571 places | | Warranty | #9,798 | #9,798 | 14,005 | Tied - the same position in the database | | Overall | #5,161 | #4,886 | 14,005 | 650MS leads by 275 places | ## Questions ### Which panel is better: Canadian Solar CS7N-645MS or Canadian Solar CS7N-650MS? According to our database: **Canadian Solar CS7N-650MS** has higher module efficiency (**20.90%** 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 CS7N-645MS and Canadian Solar CS7N-650MS? **Canadian Solar CS7N-645MS** has a module efficiency of **20.80%**, while **Canadian Solar CS7N-650MS** is **20.90%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Canadian Solar CS7N-645MS use vs Canadian Solar CS7N-650MS? **Canadian Solar CS7N-645MS** uses **PERC** cells; **Canadian Solar CS7N-650MS** 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 CS7N-645MS and Canadian Solar CS7N-650MS? **Canadian Solar CS7N-645MS** has a **25 years** power warranty; **Canadian Solar CS7N-650MS** 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 CS7N-645MS vs Canadian Solar CS7N-675MS](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs7n-645ms/csi-solar-co-ltd-canadian-solar-cs7n-675ms) - 6 differences, the largest is module efficiency - [Canadian Solar CS7N-645MS vs Canadian Solar CS7N-670MS](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs7n-645ms/csi-solar-co-ltd-canadian-solar-cs7n-670ms) - 5 differences, the largest is module efficiency - [Canadian Solar CS7N-645MS vs Canadian Solar CS7N-665MS](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs7n-645ms/csi-solar-co-ltd-canadian-solar-cs7n-665ms) - 3 differences, the largest is module efficiency - [Canadian Solar CS7N-645MS vs Canadian Solar CS7N-660MS](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs7n-645ms/csi-solar-co-ltd-canadian-solar-cs7n-660ms) - 3 differences, the largest is module efficiency - [Canadian Solar CS7N-645MS vs Canadian Solar CS7N-655MS](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs7n-645ms/csi-solar-co-ltd-canadian-solar-cs7n-655ms) - 3 differences, the largest is module efficiency - [Canadian Solar CS7N-645MS vs Canadian Solar CS7L-615MS](https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs7n-645ms/csi-solar-co-ltd-canadian-solar-cs7l-615ms) - 10 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/csi-solar-co-ltd-canadian-solar-cs7n-645ms/csi-solar-co-ltd-canadian-solar-cs7n-650ms 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.