--- title: "Q-SUN Solar QN-635HT-06 635W Solar Panel - Specs & Review | ComparePV" description: "Q-SUN Solar QN-635HT-06 635W solar panel. Specs: 22.72% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/q-sun-solar-qn-635ht-06" updated: 2026-09-11 --- # Q-SUN Solar QN-635HT-06 Middle of its segment, weak in heat 359 panels in the segment N-type 600-650 W ## Identity - **Manufacturer:** Q-SUN Solar - **Model:** QN-635HT-06 - **Series:** Crystal N8 615~635W - **Rated power:** 635 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 600-650 W (359 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 635 W | 625 W | Strong - top 22% | | | Module efficiency | 22.72% | 22.77% | Typical | 3,245 | | Power density | 227.2 | 227.7 | Typical | 3,252 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 11% | 6,093 | | Weight (kg) | 33.7 kg | 32.5 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.72% | 22.77% | Typical | 3,245 | | Power density | 227.2 | 227.7 | Typical | 3,252 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 11% | 6,093 | | Weight per kWp | 53.1 | 52.7 | Typical | 6,835 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **-0.300 %/°C temperature coefficient** - Bottom 11% of the N-type 600-650 W segment, against a median of -0.290. - **Best for:** Commercial and utility-scale. - **Not ideal for:** Hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 635 W - **Efficiency:** 22.72 % - **Voltage at Pmax (Vmp):** 47.53 V - **Current at Pmax (Imp):** 13.36 A - **Open-circuit voltage (Voc):** 55.99 V - **Short-circuit current (Isc):** 14.36 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.300 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 42 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 156 - **Bifacial:** yes ### Physical - **Length:** 2465 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 33.7 kg - **Area:** 2.80 m2 - **Power density:** 227.2 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 555 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 3245 of 14005 | | Power density | 3252 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 6835 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-type TOPCon cells** - N-type TOPCon technology reduces LID/LeTID degradation and delivers a low temperature coefficient of Pmax at -0.30%/°C, translating into more stable yields under high temperatures compared to older PERC modules. - **Bifacial construction** - The double-glass bifacial design enables additional rear-side energy gain, a meaningful advantage for ground-mount installations, carports, and sites with high-albedo surfaces. - **High unit power up to 635 Wp** - Power up to 635 Wp with 156 cells and efficiency up to 22.72% means fewer modules are needed for a given system capacity, cutting installation time and reducing racking and wiring (BoS) costs in large-scale projects. - **30-year linear power warranty** - The manufacturer provides a 30-year linear power warranty alongside a standard 15-year product warranty, favorable for investors calculating long-term LCOE, though the 15-year product warranty is typical for non-Tier-1 manufacturers. - **PID and hot-spot resistance** - The datasheet cites enhanced resistance to Potential Induced Degradation (PID) and reduced hot-spot loss, relevant for stable operation in demanding environments such as utility-scale projects. ## Cons - **Efficiency below top peers** - Maximum efficiency of 22.72% matches Talesun's TM7G78M but trails Sunpro Power TOPCon 210R (23.51%) and Longi Hi-MO X10 (23.5%) at the same 635 Wp power class, meaning a somewhat larger installed area is needed for the same capacity. - **Manufacturer outside BNEF Tier-1** - Q-SUN Solar (founded 2014) is not listed as a BNEF Tier-1 manufacturer, unlike some competing premium brands, which can complicate financing for projects requiring bankable modules. ## About this series The Q-SUN Solar Crystal N8 615-635W series is designed for installations where maximizing energy production from a given area is the primary goal. The use of **N-type cells in TOPCon technology** helps to minimize losses and maintain stable module performance even in more challenging temperature conditions, resulting in more predictable annual yields. This is a good solution for investors who want to improve their LCOE and reduce the risk of performance degradation over time. Compared to many standard modules, it stands out due to its **high module efficiency** and refined design for large-scale projects, including PV farms, carport structures, and industrial rooftops, where both parameters and installation speed are important. Depending on the system configuration and substrate, it can also offer **additional gains from the back side (bifacial design)**. For commercial and utility projects, **resistance to loads and a demanding working environment** and **appropriate warranty protection** are also crucial, as they support the long-term profitability of the investment. ## Notable figures - At 22.7% efficiency, this panel is on par with typical \*\*N-type 600-650W\*\* modules - At 227.2 W/m² power density, roof space requirements are typical for \*\*N-type 600-650W\*\* panels - Temperature coefficient of -0.30%/°C matches the \*\*N-type 600-650W\*\* median - At 33.7 kg (1.2 kg above \*\*N-type 600-650W\*\* median of 32.5 kg), requires checking roof load capacity - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof ## Questions ### What is TOPCon technology and why is it used in the Q-SUN Solar Crystal N8 series? TOPCon (Tunnel Oxide Passivated Contact) is an advanced N-type cell technology that reduces charge carrier recombination through a thin tunnel oxide layer. In the Crystal N8 615–635W series, this translates to module efficiency of approximately 22–22.7%, a low temperature coefficient of −0.30%/°C, and better output at high temperatures compared to conventional PERC modules. For investors, this means more kilowatt-hours from the same roof or ground area. ### What warranty is included with Q-SUN Solar Crystal N8 615–635W panels? The manufacturer provides a 15-year product warranty covering defects and workmanship, along with a 30-year linear power warranty guaranteeing that modules retain a specified minimum percentage of their rated output over time. These are standard terms for N-type TOPCon products and provide a solid basis for long-term ROI and LCOE calculations, particularly in commercial and utility-scale projects. ### How much additional yield can the bifacial Q-SUN Solar Crystal N8 generate? As a bifacial module, the Crystal N8 captures reflected light on its rear side. The actual albedo gain depends on ground surface material — light gravel, concrete, or snow reflect more than dark soil — as well as mounting height and tilt angle. In typical ground-mount or carport installations, the bifacial bonus ranges from a few percent to over 10% compared to a monofacial module with the same nameplate power. ### What types of installations are Q-SUN Solar Crystal N8 635W panels best suited for? With up to 635 Wp per module, the Crystal N8 series is optimized for high power-density projects: utility-scale PV farms, industrial and warehouse rooftops, and carports. The large module format (2465×1134 mm, approx. 33.7 kg) reduces the module count per MW of installed capacity, shortening installation time and lowering overall BoS costs. For small residential rooftops, a smaller-format panel would be a better fit. ### How do Q-SUN Solar Crystal N8 panels perform in high summer temperatures? The power temperature coefficient for the Crystal N8 series is approximately −0.30%/°C, meaning lower thermal losses than typical PERC modules (usually −0.35%/°C). N-type TOPCon technology helps maintain stable output during hot weather. In warm climates or on heavily sun-exposed industrial rooftops, this can translate to several additional MWh per year compared to previous-generation modules. ### Is Q-SUN Solar a Tier 1 manufacturer and does it matter when buying? Q-SUN Solar is not currently listed as a Tier 1 manufacturer in Bloomberg NEF rankings. It is worth noting that Tier 1 is a financial classification based on production scale and creditworthiness — not a direct measure of panel quality. When selecting this brand, it is advisable to review the warranty terms carefully, assess the financial stability of the local distributor handling warranty claims, and consider available product insurance options to mitigate counterparty risk. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/156-183-75-qnht-6-615-635w-n-type-qrystal-mono-crystalline-0-493c8bbdd0a4.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +2.5 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +45 W, lighter, +2.5 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +40 W, lighter, +2.3 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +2.3 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +2.1 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | Cooler, lighter, +2.1 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +2.1 pp | | [Q-SUN Solar QN-615HT-06](https://comparepv.com/panel/q-sun-solar-qn-615ht-06) | 615 W | -20 W, -0.5 pp | | [Q-SUN Solar QN-620HT-06](https://comparepv.com/panel/q-sun-solar-qn-620ht-06) | 620 W | -15 W, -0.3 pp | | [Q-SUN Solar QN-625HT-06](https://comparepv.com/panel/q-sun-solar-qn-625ht-06) | 625 W | -10 W, -0.2 pp | | [Q-SUN Solar QN-630HT-06](https://comparepv.com/panel/q-sun-solar-qn-630ht-06) | 630 W | Very close match | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +65 W, cooler, +2.3 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +60 W, cooler, +2.2 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +35 W, cooler, +2.1 pp | --- Source: https://comparepv.com/panel/q-sun-solar-qn-635ht-06 Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.