--- title: "Canadian Solar CS3W-445MB-AG vs Canadian Solar CS7N-670MB-AG - Solar Panel Comparison | ComparePV" description: "Compare Canadian Solar CS3W-445MB-AG vs Canadian Solar CS7N-670MB-AG side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/canadian-solar-cs3w-445mb-ag/csi-solar-co-ltd-cs7n-670mb-ag" updated: 2026-09-11 --- # Canadian Solar CS3W-445MB-AG vs Canadian Solar CS7N-670MB-AG CS7N-670MB-AG leads on the differences that matter The largest is module efficiency: 1.70 pp more efficient. 5 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Canadian Solar CS3W-445MB-AG](https://comparepv.com/panel/canadian-solar-cs3w-445mb-ag) | [Canadian Solar CS7N-670MB-AG](https://comparepv.com/panel/csi-solar-co-ltd-cs7n-670mb-ag) | | Manufacturer | Canadian Solar | Canadian Solar | | Power | 445 Wp | 670 Wp | | Efficiency | 19.90 % | 21.60 % | | Technology | PERC | PERC | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | CS3W-445MB-AG | CS7N-670MB-AG | Difference | | --- | --- | --- | --- | | Module efficiency | 19.90 % | 21.60 % | +1.70 pp for CS7N-670MB-AG | | Rated power | 445 Wp | 670 Wp | +225 W for CS7N-670MB-AG | | Power density | 199.2 Wp/m² | 215.7 Wp/m² | +16.5 Wp/m² for CS7N-670MB-AG | | Weight | 28.4 kg | 37.8 kg | -9.4 kg for CS3W-445MB-AG | | Weight per kWp | 63.8 kg/kWp | 56.4 kg/kWp | -7.4 kg/kWp for CS7N-670MB-AG | | Short-circuit current | 11.54 A | 18.55 A | 7.01 A apart | | Module area | 2.234 m² | 3.106 m² | 0.872 m² apart | | Open-circuit voltage | 48.90 V | 45.80 V | 3.10 V apart | | Temperature coefficient | -0.350 %/°C | -0.340 %/°C | +0.010 %/°C for CS7N-670MB-AG | | Current at max power | 10.89 A | 17.32 A | 6.43 A apart | | Cell count | 144 | 132 | 12 cells apart | | Voltage at max power | 40.90 V | 38.70 V | 2.20 V apart | | Dimensions | 2132x1048x30 mm | 2384x1303x33 mm | 2132x1048x30 mm vs 2384x1303x33 mm | ## Every compared parameter | Parameter | CS3W-445MB-AG | CS7N-670MB-AG | | --- | --- | --- | | Rated power | 445 Wp | 670 Wp | | Module efficiency | 19.90 % | 21.60 % | | Power density | 199.2 Wp/m² | 215.7 Wp/m² | | Open-circuit voltage | 48.90 V | 45.80 V | | Voltage at max power | 40.90 V | 38.70 V | | Short-circuit current | 11.54 A | 18.55 A | | Current at max power | 10.89 A | 17.32 A | | Temperature coefficient | -0.350 %/°C | -0.340 %/°C | | Dimensions | 2132x1048x30 mm | 2384x1303x33 mm | | Module area | 2.234 m² | 3.106 m² | | Weight | 28.4 kg | 37.8 kg | | Weight per kWp | 63.8 kg/kWp | 56.4 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | - | 0.45 %/yr | | Cell technology | PERC | PERC | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 144 | 132 | | Bifacial | Yes | Yes | ## Thirty-year yield A 1.0% first-year loss then 0.40% a year, assumed for both panels, at 1,200 kWh/kWp a year - **Cumulative output, CS3W-445MB-AG:** 14,931 kWh - **Cumulative output, CS7N-670MB-AG:** 22,480 kWh - **Gap:** 7,549 kWh ## Output when hot | Condition | Cell temperature | CS3W-445MB-AG | CS7N-670MB-AG | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 445 W | 670 W | 100.0% of rated power | | Cool, bright day | 40 °C | 422 W | 636 W | 94.8% of rated power | | Typical summer roof | 55 °C | 398 W | 602 W | 89.5% of rated power | | Hot roof | 70 °C | 375 W | 567 W | 84.2% of rated power | ## Against the whole database | Measure | CS3W-445MB-AG | CS7N-670MB-AG | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #12,331 | #7,652 | 14,005 | CS7N-670MB-AG leads by 4,679 places | | Power density | #12,319 | #7,644 | 14,005 | CS7N-670MB-AG leads by 4,675 places | | Heat behaviour | #10,419 | #8,778 | 14,005 | CS7N-670MB-AG leads by 1,641 places | | Weight | #12,932 | #10,647 | 14,005 | CS7N-670MB-AG leads by 2,285 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #11,245 | #2,462 | 14,005 | CS7N-670MB-AG leads by 8,783 places | ## Questions ### Which panel is better: Canadian Solar CS3W-445MB-AG or Canadian Solar CS7N-670MB-AG? According to our database: **Canadian Solar CS7N-670MB-AG** has higher module efficiency (**21.60%** vs **19.90%**); **Canadian Solar CS7N-670MB-AG** 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 Canadian Solar CS3W-445MB-AG and Canadian Solar CS7N-670MB-AG? **Canadian Solar CS3W-445MB-AG** has a module efficiency of **19.90%**, while **Canadian Solar CS7N-670MB-AG** is **21.60%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Canadian Solar CS3W-445MB-AG use vs Canadian Solar CS7N-670MB-AG? **Canadian Solar CS3W-445MB-AG** uses **PERC** cells; **Canadian Solar CS7N-670MB-AG** 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 CS3W-445MB-AG and Canadian Solar CS7N-670MB-AG? **Canadian Solar CS3W-445MB-AG** has a **30 years** power warranty; **Canadian Solar CS7N-670MB-AG** 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 CS3W-445MB-AG and Canadian Solar CS7N-670MB-AG bifacial panels? Both **Canadian Solar CS3W-445MB-AG** and **Canadian Solar CS7N-670MB-AG** are bifacial - they capture reflected light from the ground, which can add 5**-15%** more annual energy on ground-mount or elevated rooftop installations with a light surface beneath. ## Related comparisons - [Canadian Solar CS3W-445MB-AG vs Canadian Solar CS7N-665MB-AG](https://comparepv.com/compare/canadian-solar-cs3w-445mb-ag/csi-solar-co-ltd-canadian-solar-cs7n-665mb-ag) - 13 differences, the largest is module efficiency - [Canadian Solar CS3W-445MB-AG vs Canadian Solar CS7N-660MB-AG](https://comparepv.com/compare/canadian-solar-cs3w-445mb-ag/csi-solar-co-ltd-canadian-solar-cs7n-660mb-ag) - 13 differences, the largest is module efficiency - [Canadian Solar CS3W-445MB-AG vs Canadian Solar CS7N-655MB-AG](https://comparepv.com/compare/canadian-solar-cs3w-445mb-ag/csi-solar-co-ltd-canadian-solar-cs7n-655mb-ag) - 13 differences, the largest is module efficiency - [Canadian Solar CS3W-445MB-AG vs Canadian Solar CS7N-650MB-AG](https://comparepv.com/compare/canadian-solar-cs3w-445mb-ag/csi-solar-co-ltd-canadian-solar-cs7n-650mb-ag) - 13 differences, the largest is module efficiency - [Canadian Solar CS3W-445MB-AG vs Canadian Solar CS7N-645MB-AG](https://comparepv.com/compare/canadian-solar-cs3w-445mb-ag/csi-solar-co-ltd-canadian-solar-cs7n-645mb-ag) - 13 differences, the largest is module efficiency - [Canadian Solar CS3W-445MB-AG vs Canadian Solar CS7N-640MB-AG](https://comparepv.com/compare/canadian-solar-cs3w-445mb-ag/csi-solar-co-ltd-canadian-solar-cs7n-640mb-ag) - 13 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/canadian-solar-cs3w-445mb-ag/csi-solar-co-ltd-cs7n-670mb-ag 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.