--- title: "Canadian Solar CS6.2-66HB-645 645W Solar Panel - Specs & Review | ComparePV" description: "Canadian Solar CS6.2-66HB-645 645W solar panel. Specs: 23.90% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs6-2-66hb-645" updated: 2026-09-11 --- # Canadian Solar CS6.2-66HB-645 Space saver, no clear weak spot 76 panels in the segment HJT 600-650 W ## Identity - **Manufacturer:** Canadian Solar - **Model:** CS6.2-66HB-645 - **Series:** HiHero+ Bifacial HJT - **Rated power:** 645 W - **Cell technology:** HJT - **Bifacial:** yes ## How it compares Compared against segment HJT 600-650 W (76 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 645 W | 625 W | Strong - top 3% | | | Module efficiency | 23.90% | 22.60% | Strong - top 3% | 351 | | Power density | 238.8 | 225.8 | Strong - top 1% | 356 | | Temperature coefficient | -0.240 | -0.240 | Typical | 13 | | Weight (kg) | 32.8 kg | 33.6 kg | Strong - top 2% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.90% | 22.60% | Strong - top 3% | 351 | | Power density | 238.8 | 225.8 | Strong - top 1% | 356 | | Temperature coefficient | -0.240 | -0.240 | Typical | 13 | | Weight per kWp | 50.9 | 54.7 | Strong - top 2% | 4,247 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **238.8 watts per square metre** - Top 1% of the HJT 600-650 W segment, against a median of 225.8. Ranked 356th in the whole database. - **50.9 kg per kWp** - Top 2% of the HJT 600-650 W segment, against a median of 54.7. Ranked 4,247th in the whole database. - **23.90% module efficiency** - Top 3% of the HJT 600-650 W segment, against a median of 22.60%. Ranked 351st in the whole database. - **Best for:** Utility-scale, commercial and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 645 W - **Efficiency:** 23.90 % - **Voltage at Pmax (Vmp):** 42.80 V - **Current at Pmax (Imp):** 15.07 A - **Open-circuit voltage (Voc):** 50.40 V - **Short-circuit current (Isc):** 16.13 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.240 %/degC - **Temperature coefficient of Voc:** -0.230 %/degC - **Temperature coefficient of Isc:** 0.050 %/degC - **NOCT:** 41 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** HJT - **Cell count:** 132 - **Bifacial:** yes - **Bifacial gain:** 20.00 ### Physical - **Length:** 2382 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 32.8 kg - **Area:** 2.70 m2 - **Power density:** 238.8 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 90.3 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.30 % - **Output after 30 years:** 582 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 351 of 14005 | | Power density | 356 of 14005 | | Temperature coefficient | 13 of 14005 | | Weight | 4247 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Up to 23.9% Efficiency – Segment Leader** - The top-tier HiHero+ variant achieves 23.9% efficiency, clearly outperforming direct competitors: Runergy HY-DH156N8 (23.1%), Tongwei TWMND (23.1%), and BYD HALO (22.79%). On an identical roof area, this translates into meaningfully higher annual energy yield without increasing the module count. - **Temperature Coefficient of -0.24%/°C** - The datasheet-confirmed Pmax temperature coefficient of -0.24%/°C is among the lowest available in commercial bifacial modules as of 2025 (standard PERC: approx. -0.35%/°C; TOPCon: approx. -0.30%/°C). In Poland's climate, where module temperatures regularly exceed 60°C in summer, this advantage translates into several percentage points of additional yield compared to PERC technology at peak season. - **Up to 90% Bifaciality – Above-Standard Rear-Side Gain** - The manufacturer rates bifaciality at up to 90%, whereas typical standard-class bifacial modules achieve 70–75%. On ground-mounted systems with high-albedo surfaces (gravel, light-colored membranes), this results in a significant, measurable increase in rear-side power generation. - **HJT N-Type Technology: No LID or BOILD** - Heterojunction (HJT) cells are inherently immune to light-induced degradation (LID) and boron-oxygen light-induced degradation (BOILD), which in PERC technology cause a permanent power loss of 1–3%. First-year degradation is ≤0.35%/year, and the 30-year linear power warranty is made possible precisely by this long-term stability. - **BNEF Tier 1 – Manufacturer Bankability** - Canadian Solar is listed on the BNEF Tier 1 index (Q1 2026) with an annual production capacity of 61,000 MWp, placing it among the top global manufacturers. Tier 1 status is a prerequisite for project finance on utility-scale PV installations above 1 MW — specifying these modules introduces no bankability risk. ## Cons - **15-Year Product Warranty vs. 25 Years from Competitors** - The HiHero+ series carries a 15-year product warranty covering manufacturing defects, seals, and frames, whereas many premium Tier-1 N-type modules — including BYD, Jinko Neo, and JA DeepBlue 4.0 — offer a standard 25-year product warranty. This gap is particularly relevant for projects with long financing horizons or insurance requirements that mandate a minimum product warranty period. ## About this series The HiHero+ Bifacial HJT series is a breakthrough solution based on **heterojunction technology (HJT)**, which sets new efficiency standards in the Polish photovoltaics sector. By combining the advantages of crystalline silicon and thin-film technology, these panels eliminate typical energy losses, offering the highest operational stability in all weather conditions. The use of N-type cells makes the modules almost completely resistant to light-induced degradation phenomena, which guarantees **above-average long-term durability** and real profits after many years of operation. The bifacial design allows for additional energy generation from reflected radiation, which, combined with an exceptionally **low temperature coefficient**, ensures that the installation maintains high efficiency even on hot summer days. It is an ideal choice for investors requiring maximum yield from limited roof space and for modern ground-mounted farms focusing on innovation. They are distinguished from the competition by unique cell symmetry that minimizes the risk of micro-cracks and **maximization of yields in low light**, making them exceptionally effective at our latitude. By choosing this solution, the investor receives a premium-class product that effectively solves the problem of power drop at high temperatures, ensuring the highest level of energy security. ## Notable figures - Efficiency of 23.9% is 1.3pp above the \*\*HJT 600-650W\*\* median (22.6%) - 238.8 W/m² power density - 13.0 W/m² more than \*\*HJT 600-650W\*\* median (225.8 W/m²), more power per roof area - Temperature coefficient of -0.24%/°C matches the \*\*HJT 600-650W\*\* median - Bifacial design (90% factor) captures reflected light - adds 4-14% yield on ground-mount or white roof - Ranked #351 out of 14005 panels for efficiency in the database ## Questions ### What warranty does the Canadian Solar HiHero+ Bifacial HJT series carry? The HiHero+ Bifacial HJT series is backed by a 15-year product warranty and a 30-year power output warranty from the manufacturer. This means that after 30 years of operation, the module is guaranteed to retain at least 87.4% of its original nominal power. This is one of the longest power warranties currently available on the market, making this series particularly attractive for long-term investment projects. ### What is HJT technology, and is the premium price of HiHero+ modules justified compared to standard modules? HJT (Heterojunction Technology) combines a crystalline silicon wafer with amorphous silicon layers, enabling the module to achieve an efficiency of approximately 23% and a temperature coefficient of just -0.24%/°C. In practice, this means minimal power loss on hot days. By comparison, typical PERC modules lose roughly twice as much power for the same temperature rise. The price premium is therefore genuinely justified, especially in installations where every square meter of roof area counts. ### Does the Canadian Solar HiHero+ 645 Wp perform well on overcast days typical of the Polish climate? Yes. HJT technology and n-type cells deliver exceptionally high efficiency under diffuse, low-irradiance conditions. A bifaciality factor of up to 90% means the rear side of the module captures additional radiation reflected from the ground surface even under cloud cover. As a result, the HiHero+ generates proportionally more energy on overcast days than standard monofacial PERC-class modules. ### Are bifacial HiHero+ Bifacial panels worth deploying on a pitched roof, or only on ground-mounted systems? Bifaciality delivers the greatest gains on ground-mounted systems with high-albedo surfaces, but pitched roofs with a light-colored finish or a reflective membrane can also yield rear-side gains of several to more than ten percent. On a typical clay-tile roof the additional yield is smaller; however, the HiHero+'s high 23% efficiency and low temperature coefficient still translate into better overall performance than standard modules, even when only the front side contribution is considered. ### Are Canadian Solar HiHero+ modules resistant to microcracks during transportation and installation? The HiHero+ series uses a symmetrical cell layout that distributes mechanical stress more evenly than conventional designs, reducing the risk of microcracks. HJT cells are manufactured at low process temperatures, which minimizes the thermal stresses introduced during lamination. As a Bloomberg Tier 1 manufacturer, Canadian Solar subjects its modules to rigorous mechanical testing, including snow load resistance up to 5,400 Pa and wind load resistance up to 2,400 Pa. ### Is the Canadian Solar HiHero+ Bifacial HJT series still available in Poland? Yes, the HiHero+ Bifacial HJT series is currently in production and available on the Polish market. Canadian Solar regularly updates this product line, and modules with power ratings up to 645 Wp can be purchased through authorized renewable energy distributors. Before placing an order, it is advisable to confirm the availability of the specific power variant you require, as the highest-wattage configurations may have longer lead times. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/1547220839690b0b35d6008-0d8baeaa645a.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Hotter, lighter, +1.3 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +35 W, lighter, +1.3 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +30 W, lighter, +1.1 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Hotter, lighter, +1.1 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +50 W, hotter, +1.0 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +25 W, lighter, +0.9 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +25 W, lighter, +0.9 pp | | [Canadian Solar CS6.2-66TB-600HP](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs6-2-66tb-600hp) | 600 W | Hotter, heavier, -1.7 pp | | [Canadian Solar CS6.2-66TB-605HP](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs6-2-66tb-605hp) | 605 W | Hotter, heavier, -1.5 pp | | [Canadian Solar CS6.2-66TB-610HP](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs6-2-66tb-610hp) | 610 W | Hotter, heavier, -1.3 pp | | [Canadian Solar CS6.2-66TB-615HP](https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs6-2-66tb-615hp) | 615 W | Hotter, heavier, -1.1 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +55 W, hotter, +1.1 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +25 W, hotter, +0.9 pp | --- Source: https://comparepv.com/panel/csi-solar-co-ltd-canadian-solar-cs6-2-66hb-645 Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.