--- title: "Canadian Solar CS7N-665MS 665W Solar Panel - Specs & Review | ComparePV" description: "Canadian Solar CS7N-665MS 665W solar panel. Specs: 21.40% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs7n-665ms" updated: 2026-09-11 --- # Canadian Solar CS7N-665MS Middle of its segment, short guarantee 320 panels in the segment PERC 650-700 W ## Identity - **Manufacturer:** Canadian Solar - **Model:** CS7N-665MS - **Series:** HiKu7 Mono PERC - **Rated power:** 665 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 650-700 W (320 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 665 W | 660 W | Typical | | | Module efficiency | 21.40% | 21.25% | Typical | 8,323 | | Power density | 214.1 | 212.5 | Typical | 8,250 | | Temperature coefficient | -0.340 | -0.340 | Typical | 8,778 | | Weight (kg) | 33.9 kg | 34.5 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 21% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.40% | 21.25% | Typical | 8,323 | | Power density | 214.1 | 212.5 | Typical | 8,250 | | Temperature coefficient | -0.340 | -0.340 | Typical | 8,778 | | Weight per kWp | 51.0 | 52.3 | Typical | 4,337 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 21% | 9,798 | ### Watch out for - **25 year performance warranty** - Bottom 21% of the PERC 650-700 W segment, against a median of 30 yrs. - **Best for:** Utility-scale, commercial and shaded-installations. - **Not ideal for:** Owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 665 W - **Efficiency:** 21.40 % - **Voltage at Pmax (Vmp):** 38.50 V - **Current at Pmax (Imp):** 17.28 A - **Open-circuit voltage (Voc):** 45.60 V - **Short-circuit current (Isc):** 18.51 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.340 %/degC - **Temperature coefficient of Voc:** -0.260 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 41 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 132 ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 33.9 kg - **Area:** 3.11 m2 - **Power density:** 214.1 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 84.8 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.55 % - **Output after 30 years:** 546 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 8323 of 14005 | | Power density | 8250 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 4337 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Module Power Up to 675 Wp — On Par with Segment Leaders** - The 675 Wp upper limit matches the maximum output of direct competitors in this segment (BYD AURO MSTK-33, Neo Solar NESE, Trina Vertex TSM-DE21). Fewer modules per installed MW translates to lower structural, wiring, and logistics costs — a particularly significant advantage in utility-scale PV plants and rooftop systems above 500 kWp. - **Industrial-Grade Mechanical Resilience** - Datasheet V2.81 (July 2024) confirms a snow load rating of up to 5,400 Pa and wind load of up to 2,400 Pa. These values are typical for the industrial segment and allow installation in climate zones I–III per PN-EN standards without additional structural reinforcement. - **LID/LeTID Reduction of Up to 50%** - Canadian Solar employs active mitigation of light-induced degradation (LID) and light- and elevated temperature-induced degradation (LeTID), claiming up to 50% lower losses from these mechanisms compared to standard PERC modules. This results in more stable energy yield during the first 3–5 years of operation, when LID effects are most pronounced. - **Tier-1 Bankable — Streamlined Project Financing** - Canadian Solar (founded 2001) has maintained continuous Tier-1 status on BNEF rankings for years, facilitating access to project finance and leasing arrangements. For EPC contractors and utility-scale PV developers, this shortens the due diligence process and reduces required risk spreads. - **25-Year Linear Power Warranty** - The industry-standard 25-year linear power warranty guarantees annual degradation of ≤0.55% after year 1. This provides predictable energy production inputs for DCF models and is accepted by the majority of lenders financing renewable energy projects. ## Cons - **PERC, Not TOPCon — Higher Annual Degradation Rate** - PERC technology carries a degradation rate of ≤0.55%/year, whereas N-type TOPCon modules — including Canadian Solar's own TOPBiHiKu7 — degrade at approximately 0.25–0.30%/year. Over a 25-year horizon on a 1 MWp installation, this difference amounts to a real 3–5% gap in cumulative energy production, translating into a material revenue shortfall for large-scale PV farms. - **Monofacial Design — No Bifacial Gain** - The series is monofacial and therefore cannot capture ground-reflected irradiance (albedo). Competing TOPCon series — such as Canadian Solar's own TOPBiHiKu7 and the BYD AURO bifacial lineup — offer 10–20% additional rear-side yield in ground-mounted installations with high-albedo surfaces, directly improving LCOE in utility-scale projects. ## About this series The Canadian Solar HiKu7 Mono PERC series are modules based on **dual cell and PERC technology**, designed for high power per panel and efficient system scaling. In practice, this translates to fewer modules needed to achieve the target power output, resulting in a simpler design for construction, wiring, and logistics - particularly advantageous for large rooftops and PV farms. The HiKu7 series distinguishes itself through its commitment to longevity: limitations have been implemented for **LID and LeTID degradation**, which helps stabilize energy yields over the long term and reduces the risk of performance drops typical for PERC modules. The series also focuses on **hot-spot resistance** and improved performance under partial shading, offering a real advantage in projects with topological obstructions or uneven exposure. This is an excellent choice for investors, EPCs, and installation companies seeking to lower the energy cost-of-electricity (LCOE) over time and optimize system costs without compromising on reliability. The modules are also designed for **compatibility with popular inverters**, simplifying equipment selection in standard projects. ## Notable figures - Efficiency of 21.4% matches the \*\*PERC 650-700W\*\* median - At 214.1 W/m² power density, roof space requirements are typical for \*\*PERC 650-700W\*\* panels - At -0.34%/°C, hot weather performance is typical for \*\*PERC 650-700W\*\* panels - Ranked #8323 out of 14005 panels for efficiency in the database ## Questions ### What warranty does Canadian Solar offer on the HiKu7 Mono PERC series? Canadian Solar provides a 12-year product warranty covering materials and workmanship, along with a 25-year linear power output warranty for the HiKu7 Mono PERC series. Under the linear power warranty, first-year degradation must not exceed 2%, with a maximum annual degradation of 0.55% in subsequent years. This means that after 25 years, the module should retain at least approximately 84.8% of its nominal rated power. ### What are LID and LeTID technologies, and why do they matter for the HiKu7 series? LID (Light Induced Degradation) and LeTID (Light and Elevated Temperature Induced Degradation) are phenomena that cause power loss in PERC modules during the first months of operation. In the HiKu7 series, Canadian Solar has implemented active mitigation of both effects, which stabilizes energy yield and reduces the risk of unexpected performance drops — particularly during hot, sunny periods. ### How many Canadian Solar HiKu7 675 W panels do I need for a 10 kW system? With a peak power rating of 675 Wp, only 15 HiKu7 modules are required to achieve a 10 kW system. By comparison, standard 400 W panels would require 25 units. The reduced module count simplifies the structural design, shortens installation time, and lowers Balance of System (BoS) wiring costs — benefits that are especially significant on large industrial rooftops or utility-scale PV farms. ### Are the HiKu7 Mono PERC panels rated for snow loads and high wind speeds under Polish climate conditions? Yes, the HiKu7 series is engineered for demanding climatic conditions. The modules withstand snow loads of up to 5,400 Pa and wind pressure of 2,400–3,600 Pa, depending on the mounting configuration. This ensures compliance with Polish construction standards for the majority of regions in the country, including mountainous areas and the highly wind-exposed Baltic coastal zone. ### Which inverters are compatible with the Canadian Solar HiKu7 Mono PERC panels? The HiKu7 series is compatible with most mainstream inverters available on the market, including solutions from SMA, Fronius, Huawei, SolarEdge, and GoodWe. The system voltage is rated up to 1,500 V DC, enabling longer string configurations and simplifying the electrical design of the installation. When in doubt, compatibility should be verified using the specific inverter manufacturer's string sizing or configuration tool. ### Will the Canadian Solar HiKu7 Mono PERC perform well in partial shading conditions? Thanks to the half-cut cell technology, the HiKu7 series handles partial shading significantly better than conventional full-cell modules. Splitting the cells in half reduces power losses when shade falls on part of the module, while the integrated bypass diode circuits minimize the risk of hot-spot formation. This is a notable advantage for rooftop installations affected by chimneys, dormers, or nearby vegetation. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/cs-datasheet-hiku7-cs7n-ms-v2-81-en-0f1708f9f7fd.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +3.8 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, +3.8 pp, +5 yr warranty | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, +3.6 pp, +5 yr warranty | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +3.6 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | Cooler, +3.6 pp, +5 yr warranty | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | Cooler, +3.5 pp, +5 yr warranty | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +3.4 pp | | [Canadian Solar CS7N-640MB-AG](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs7n-640mb-ag) | 640 W | Heavier, -0.8 pp, +5 yr warranty | | [Canadian Solar CS7N-645MS](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs7n-645ms) | 645 W | -20 W, -0.6 pp | | [Canadian Solar CS7N-650MS](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs7n-650ms) | 650 W | -15 W, -0.5 pp | | [Canadian Solar CS7N-655MB-AG](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs7n-655mb-ag) | 655 W | Heavier, -0.3 pp, +5 yr warranty | | [Canadian Solar CS7N-660MS](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs7n-660ms) | 660 W | Very close match | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +140 W, cooler, +3.7 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +135 W, cooler, +3.5 pp | | [AIKO AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 W | +130 W, cooler, +3.4 pp | | [AIKO AIKO-A790-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a790-grh78dw) | 790 W | +125 W, cooler, +3.2 pp | --- Source: https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs7n-665ms Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.