--- title: "Q-SUN Solar QN-660HJT-01 660W Solar Panel - Specs & Review | ComparePV" description: "Q-SUN Solar QN-660HJT-01 660W solar panel. Specs: 23.30% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/q-sun-solar-qn-660hjt-01" updated: 2026-09-11 --- # Q-SUN Solar QN-660HJT-01 Strong in heat, no clear weak spot 109 panels in the segment N-type 650-700 W ## Identity - **Manufacturer:** Q-SUN Solar - **Model:** QN-660HJT-01 - **Series:** Qrystal Max N12 (N-type) 640–670W - **Rated power:** 660 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 650-700 W (109 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 660 W | 660 W | Typical | | | Module efficiency | 23.30% | 23.30% | Typical | 1,017 | | Power density | 233.2 | 233.2 | Typical | 1,089 | | Temperature coefficient | -0.240 | -0.290 | Strong - top 2% | 13 | | Weight (kg) | 35.5 kg | 33.5 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.30% | 23.30% | Typical | 1,017 | | Power density | 233.2 | 233.2 | Typical | 1,089 | | Temperature coefficient | -0.240 | -0.290 | Strong - top 2% | 13 | | Weight per kWp | 53.8 | 50.9 | Typical | 7,860 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **-0.240 %/°C temperature coefficient** - Top 2% of the N-type 650-700 W segment, against a median of -0.290. Ranked 13th in the whole database. - **Best for:** Commercial and utility-scale. ## Specification ### Electrical - **Rated power (Pmax):** 660 W - **Efficiency:** 23.30 % - **Voltage at Pmax (Vmp):** 39.15 V - **Current at Pmax (Imp):** 16.85 A - **Open-circuit voltage (Voc):** 46.36 V - **Short-circuit current (Isc):** 17.75 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.240 %/degC - **Temperature coefficient of Voc:** -0.240 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 120 - **Bifacial:** yes ### Physical - **Length:** 2172 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 35.5 kg - **Area:** 2.83 m2 - **Power density:** 233.2 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:** 0.40 % - **Output after 30 years:** 577 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 1017 of 14005 | | Power density | 1089 of 14005 | | Temperature coefficient | 13 of 14005 | | Weight | 7860 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Efficiency well above peer comparables** - Module efficiency of 22.6–23.7% clearly exceeds comparable series at the same 670 Wp power class - Hiwatt HW-M12/132H (21.6%), Techwise Summit Series (21.57%) and Resun RS9H-M (21.57%). The 1-2 percentage-point gap translates into a meaningfully smaller roof area needed for the same installed capacity. - **N-type cells with lower degradation** - N-type technology limits the LID/LeTID losses typical of PERC and performs better at high temperatures, delivering a more predictable annual yield in Poland's climate, which includes significant summer heat and partial shading periods. - **Bifacial modules boosting yield** - The dual-sided design captures additional reflected light, which is especially beneficial on bright industrial roofs, EPDM/PVC membranes, and elevated-mount ground installations. - **30-year power warranty** - The manufacturer offers a 30-year power warranty - 5 years longer than the standard 25-year terms typical of most comparable P-type/PERC series in the 640-670W segment, improving the long-term LCOE balance. - **TOPCon architecture for variable irradiance** - The TOPCon architecture supports more stable performance under diffuse and variable irradiance, which matters in Poland given the high share of overcast days and frequent morning/afternoon shading. ## Cons - **Production discontinued in 2024** - The series launched in 2023 and was discontinued in 2024 - secondary-market availability is limited, and warranty servicing over the stated 15/30-year coverage period may be more difficult to secure. - **Manufacturer not on the BNEF Tier 1 list** - Q-SUN Solar (founded 2014) does not appear on BloombergNEF's bankable Tier 1 manufacturer list, unlike some competing brands in the high-power segment - this can complicate bank financing for commercial projects and PV farms where Tier 1 status is often a lender requirement. ## About this series The Q-SUN Solar Qrystal Max N12 (N-type) 640-670W series is designed for maximum energy yield on limited space - where every square meter counts. The use of **N-type cells** helps minimize typical power losses over time and maintain the stable operation of the system for many years, which realistically improves the return on investment. The modules utilize **bifacial technology**, allowing them to also generate power from reflected light, which is particularly beneficial on bright roofs, membranes, and ground-mounted structures. The **TOPCon architecture** is also noteworthy, as it supports high efficiency under variable solar conditions - which is important given the typical Polish weather, frequent cloud cover, and morning or afternoon shadows. The series is a good choice for **PV farms**, large industrial rooftops, and commercial projects, where a high yield and predictable production are the priority. It distinguishes itself from the competition through the combination of N-type, bifacial, and TOPCon technology in the high-power segment, which is focused on achieving a better energy balance throughout the entire lifespan of the system. ## Notable figures - Efficiency of 23.3% matches the \*\*N-type 650-700W\*\* median - At 233.2 W/m² power density, roof space requirements are typical for \*\*N-type 650-700W\*\* panels - Temperature coefficient of -0.24%/°C vs median -0.29%/°C means ~2% less power loss at 65°C - At 35.5 kg (2.0 kg above \*\*N-type 650-700W\*\* median of 33.5 kg), requires checking roof load capacity - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces ## Questions ### What warranty does the Q-SUN Solar Qrystal Max N12 come with and what does it cover? The Qrystal Max N12 series includes a 15-year product warranty covering material and workmanship defects, plus a 30-year linear power output warranty. The power warranty guarantees the module retains a defined percentage of its rated wattage over three decades of operation. This is a competitive warranty tier for N-type TOPCon modules and one of the key arguments for the series' long-term investment value. ### Is the Q-SUN Solar Qrystal Max N12 series still available for purchase? The Qrystal Max N12 series has been discontinued and is no longer available as a new product. If you need N-type TOPCon modules in the 640–670 W power class, we recommend inquiring about current replacement models in Q-SUN Solar's lineup or considering equivalent high-power alternatives from other manufacturers that are available through active distribution channels. ### What does bifacial technology mean in the Qrystal Max N12 and when does it actually pay off? Bifacial technology means the Qrystal Max N12 generates electricity from both the front and rear surfaces by capturing light reflected off the ground or rooftop surface. The biggest gains come from light-colored substrates — white TPO membranes, gravel ballast, or grass. On ground-mount systems and large flat industrial roofs, bifacial gain can add several percentage points to annual energy yield at no additional hardware cost. ### Do the N-type cells in the Qrystal Max N12 really degrade slower than standard P-type panels? Yes. N-type cells are significantly less susceptible to light-induced degradation (LID) — the power loss triggered by initial sun exposure that affects conventional P-type PERC cells. This translates to higher cumulative energy production over a 25–30 year system lifetime and a better LCOE for the overall installation, which is particularly relevant for large commercial and utility-scale projects. ### What type of installations are the Q-SUN Solar Qrystal Max N12 640–670W modules best suited for? With peak output up to 670 Wp and large physical dimensions, the Qrystal Max N12 is designed primarily for utility-scale solar farms, large industrial rooftops, and commercial ground-mount projects. It is not a typical fit for small residential systems — the module size and weight require purpose-built racking structures and an experienced installation crew to handle safely and efficiently. ### How do the Qrystal Max N12 panels perform under cloudy skies and diffuse irradiance? The TOPCon cell architecture in the Qrystal Max N12 delivers solid low-light performance, meaning the modules produce proportionally more energy during overcast mornings, evenings, and diffuse-light days compared to older PERC technology. This is a meaningful advantage in Central European climates like Poland's, where diffuse irradiance accounts for a substantial share of annual energy yield and full-sun hours are limited. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/hjt-640-670w-h-type-qrystal-mono-crystal-0-084-a44ff23ae966.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Hotter, lighter, +1.9 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Hotter, lighter, +1.9 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Hotter, lighter, +1.7 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Hotter, lighter, +1.7 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +40 W, hotter, +1.7 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +35 W, hotter, +1.6 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Hotter, lighter, +1.5 pp | | [Q-SUN Solar QNM210-HG590-60](https://comparepv.com/panel/qn-solar-pv-limited-qnm210-hg590-60) | 590 W | -70 W, hotter, -2.5 pp | | [Q-SUN Solar QNM210-HG595-60](https://comparepv.com/panel/qn-solar-pv-limited-qnm210-hg595-60) | 595 W | -65 W, hotter, -2.3 pp | | [Q-SUN Solar QNM210-HG600-60](https://comparepv.com/panel/qn-solar-pv-limited-qnm210-hg600-60) | 600 W | -60 W, hotter, -2.1 pp | | [Q-SUN Solar QNM210-HG605-60](https://comparepv.com/panel/qn-solar-pv-limited-qnm210-hg605-60) | 605 W | -55 W, hotter, -1.9 pp | | [Q-SUN Solar QNM210-HG610-60](https://comparepv.com/panel/qn-solar-pv-limited-qnm210-hg610-60) | 610 W | -50 W, hotter, -1.7 pp | | [Gamko New Energy GKA210N120](https://comparepv.com/panel/gamko-new-energy-gka210n120) | 680 W | Hotter, lighter, +0.7 pp | | [Gamko New Energy GKA210N120-675](https://comparepv.com/panel/gamko-new-energy-gka210n120-675) | 675 W | Hotter, lighter, +0.6 pp | | [Q-SUN Solar QN-670HJT-01](https://comparepv.com/panel/q-sun-solar-qn-670hjt-01) | 670 W | +10 W, +0.4 pp | | [Gamko New Energy GKA210N120-670](https://comparepv.com/panel/gamko-new-energy-gka210n120-670) | 670 W | Hotter, lighter, +0.4 pp | --- Source: https://comparepv.com/panel/q-sun-solar-qn-660hjt-01 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.