--- title: "Canadian Solar CS3K-335MS Solar Panel: Specs & Datasheet | ComparePV" description: "Canadian Solar CS3K-335MS solar panel. Specs: 20.20% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/canadian-solar-cs3k-335ms" image: "https://comparepv.com/og/panel/canadian-solar-cs3k-335ms.png" updated: 2026-09-11 --- # Canadian Solar CS3K-335MS Space saver, no clear weak spot 291 panels in the segment PERC 300-350 W ## Identity - **Manufacturer:** Canadian Solar - **Model:** CS3K-335MS - **Series:** KuPower CS3K-MS - **Rated power:** 335 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 300-350 W (291 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 335 W | 325 W | Strong - top 22% | | | Module efficiency | 20.20% | 19.00% | Strong - top 7% | 12,039 | | Power density | 201.6 | 190.0 | Strong - top 6% | 12,110 | | Temperature coefficient | -0.360 | -0.360 | Typical | 12,425 | | Weight (kg) | 18.5 kg | 19.0 kg | Strong - top 9% | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,912 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.20% | 19.00% | Strong - top 7% | 12,039 | | Power density | 201.6 | 190.0 | Strong - top 6% | 12,110 | | Temperature coefficient | -0.360 | -0.360 | Typical | 12,425 | | Weight per kWp | 55.2 | 60.3 | Strong - top 9% | 9,755 | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,912 | ### Strengths - **201.6 watts per square metre** - Top 6% of the PERC 300-350 W segment, against a median of 190.0. Ranked 12,110th in the whole database. - **20.20% module efficiency** - Top 7% of the PERC 300-350 W segment, against a median of 19.00%. Ranked 12,039th in the whole database. - **55.2 kg per kWp** - Top 9% of the PERC 300-350 W segment, against a median of 60.3. Ranked 9,755th in the whole database. - **Best for:** Residential and commercial. ## Specification ### Electrical - **Rated power (Pmax):** 335 W - **Efficiency:** 20.20 % - **Voltage at Pmax (Vmp):** 33.90 V - **Current at Pmax (Imp):** 9.89 A - **Open-circuit voltage (Voc):** 41.20 V - **Short-circuit current (Isc):** 10.39 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.360 %/degC - **Temperature coefficient of Voc:** -0.290 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 42 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 120 ### Physical - **Length:** 1675 mm - **Width:** 992 mm - **Thickness:** 35 mm - **Weight:** 18.5 kg - **Area:** 1.66 m2 - **Power density:** 201.6 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 25 years ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 12039 of 14129 | | Power density | 12110 of 14129 | | Temperature coefficient | 12425 of 14129 | | Weight | 9755 of 14129 | | Warranty | 9912 of 14129 | ## Pros - **Half-cut Mono PERC reduces losses** - Splitting 120 monocrystalline cells in half reduces resistive losses and improves module behavior under partial shading (leaves, chimneys, adjacent buildings) - a key advantage for installations on roofs with complex geometry. - **High mechanical durability: 6000 Pa / 4000 Pa** - The anodized aluminum frame and tempered front glass provide snow load resistance up to 6000 Pa and wind load up to 4000 Pa, placing the series above typical segment standards (5400 Pa/2400 Pa) and enabling use in harsher climatic conditions. - **Compatible with 1000 V and 1500 V systems** - Availability of IEC/UL 1000V and 1500V variants simplifies design for both residential microinstallations and larger PV farms without needing to switch module series. - **Reputable Tier-1 manufacturer, long-term warranty** - Canadian Solar (founded 2001) is a bankable Tier-1 manufacturer, offering a 12-year product warranty and 25-year linear power warranty - a standard matching peer comparables (Selfa, SunLink). - **Competitive efficiency within its generation** - Efficiency of 19-20.2% is comparable to SunLink LUXMAX (20.16%) and Selfa SV120M.5(3) (19.8%), and clearly higher than the HJT-based Huasun HSN-210R-B72 (15.1%) in this specific spec, confirming the competitiveness of PERC technology from 2018. ## Cons - **Production discontinued - limited service support** - The KuPower CS3K-MS series (launched in 2018) has been officially discontinued, meaning limited availability of identical replacement modules for future warranty claims or system expansion. - **PERC technology trails newer N-type modules** - Maximum efficiency of 20.2% falls short of current N-type TOPCon/HJT modules (22-23%+), and the older PERC generation shows higher LID/LeTID degradation compared to newer technologies available since 2022-2023. ## About this series The KuPower CS3K-MS series consists of photovoltaic modules built on **half-cut Mono PERC** technology, where monocrystalline cells split in half reduce current losses and improve panel performance under partial shading. This cell configuration allows the module to maintain higher efficiency even when part of its surface is shaded by leaves, a chimney, or a neighboring building - a solution especially valued by installers working with roofs of complex geometry. The panels stand out with a **low cell operating temperature (NMOT)** and a favorable power temperature coefficient, translating into more stable energy yield on hot days. The construction, featuring an anodized aluminum frame and tempered front glass, delivers **high resistance to snow and wind loads**, making the modules suitable for both rooftop and ground-mounted installations in demanding climate conditions. Compatibility with both 1000V and 1500V systems simplifies the design of installations of varying scale - from residential micro-systems to larger solar farms. An additional advantage is **reduced risk of cell micro-cracking**, which contributes to greater long-term durability, backed by the manufacturer's extended materials warranty and linear power output warranty. ## Notable figures - At 20.2% efficiency, this panel is 0.8pp above typical \*\*PERC 0-400W\*\* modules (median: 19.4%) - 201.6 W/m² power density - 7.4 W/m² more than \*\*PERC 0-400W\*\* median (194.2 W/m²), more power per roof area - At -0.36%/°C, hot weather performance is typical for \*\*PERC 0-400W\*\* panels - At 18.5 kg, this panel is 2.0 kg lighter than \*\*PERC 0-400W\*\* median (20.5 kg) - easier handling during installation - In the top 85% for efficiency among all PERC panels ## Questions ### Is the Canadian Solar KuPower CS3K-MS series still available for purchase? No, Canadian Solar has discontinued production of the KuPower CS3K-MS series, and this model now belongs to a legacy product line. Units can still occasionally be found in the secondary market or in distributor clearance stock, but no new batches are being manufactured. This is worth considering when planning to expand an existing installation, since sourcing an identical model for a matching addition may be difficult. ### What warranty comes with the Canadian Solar KuPower CS3K-MS 335W panels? The manufacturer provides a 12-year product warranty covering material and workmanship defects, along with a 25-year linear power output warranty. This means the panel should still deliver a significant share of its original rated power after 25 years of operation, following the degradation curve specified by Canadian Solar. This is a standard warranty level for a Tier 1 manufacturer. ### How does the half-cut Mono PERC technology in the KuPower CS3K-MS differ from standard panels? In half-cut technology, monocrystalline PERC cells are cut in half, reducing current losses and internal resistance within the module. This allows the panel to operate more efficiently and lose less power under partial shading, such as from leaves or a chimney, compared to a full-cell panel. This design is especially useful on roofs with complex geometry where minor shading is unavoidable. ### Do the KuPower CS3K-MS panels perform well on hot days? Yes, the series features a low power temperature coefficient and reduced cell operating temperature (NMOT), which limits performance drop at high ambient temperatures. In practice, this means a more stable energy yield during summer compared to older-generation panels, which is important in regions with high solar irradiance and high roof temperatures. ### Are the KuPower CS3K-MS 335W panels suitable for both rooftop and ground-mounted installations? Yes, the anodized aluminum frame and tempered front glass construction provide high resistance to snow and wind loads, making these modules suitable for both pitched roofs and larger ground-mounted systems or PV farms. Compatibility with both 1000V and 1500V systems simplifies designing installations of varying scale, from a residential microinstallation to a commercial solar farm. ### What is the maximum power and efficiency of the Canadian Solar KuPower CS3K-335MS panel? This model reaches a maximum power of 335Wp with a module efficiency of around 20.2 percent, which was a competitive result for PERC technology from 2020. The panel is not bifacial, so it only harvests energy from its front side, which is worth noting when comparing it to newer bifacial modules from the same manufacturer. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/Canadian_Solar-Datasheet-KuPower_CS3K-MS_EN-0e14de715493.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [JA Solar NS-300MH-72](https://comparepv.com/panel/ja-solar-ns-300mh-72) | 300 W | Cooler, lighter, +3.1 pp | | [PolyCrown Solar Tech NS-300MH-72](https://comparepv.com/panel/polycrown-solar-tech-ns-300mh-72) | 300 W | Cooler, lighter, +3.1 pp | | [JA Solar NS-330MH-80](https://comparepv.com/panel/ja-solar-ns-330mh-80) | 330 W | Cooler, lighter, +2.9 pp | | [PolyCrown Solar Tech NS-330MH-80](https://comparepv.com/panel/polycrown-solar-tech-ns-330mh-80) | 330 W | Cooler, lighter, +2.9 pp | | [Heckert Solar ZEUS 3.2 285WP FullBlack](https://comparepv.com/panel/heckert-solar-zeus-3-2-285wp-fullblack) | 285 W | -50 W, cooler, +2.9 pp | | [Gamko New Energy GKA182M285W](https://comparepv.com/panel/gamko-new-energy-gka182m285w) | 285 W | -50 W, lighter, +2.8 pp | | [Gamko New Energy GKA182M300W](https://comparepv.com/panel/gamko-new-energy-gka182m300w) | 300 W | -35 W, +2.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M320W](https://comparepv.com/panel/gamko-new-energy-gka210m320w) | 320 W | Lighter, +2.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M340W](https://comparepv.com/panel/gamko-new-energy-gka210m340w) | 340 W | Lighter, +2.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M360W](https://comparepv.com/panel/gamko-new-energy-gka210m360w) | 360 W | +25 W, +2.8 pp, +5 yr warranty | | [Canadian Solar CS3K-295P-AG](https://comparepv.com/panel/canadian-solar-cs3k-295p-ag) | 295 W | -40 W, -2.4 pp, +5 yr warranty | | [Canadian Solar CS3K-300MS](https://comparepv.com/panel/canadian-solar-cs3k-300ms) | 300 W | -35 W, -2.1 pp | | [Canadian Solar CS3K-305MS](https://comparepv.com/panel/canadian-solar-cs3k-305ms) | 305 W | -30 W, -1.8 pp | | [Canadian Solar CS3K-310MS](https://comparepv.com/panel/canadian-solar-cs3k-310ms) | 310 W | -25 W, -1.5 pp | | [Maxeon SPR-MAX3-400-COM](https://comparepv.com/panel/maxeon-spr-max3-400-com) | 400 W | Cooler, +2.4 pp, +15 yr warranty | | [Lina Energy LEPV 400](https://comparepv.com/panel/lina-energy-lepv-400) | 400 W | +65 W, cooler, +2.1 pp | --- Source: https://comparepv.com/panel/canadian-solar-cs3k-335ms Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.