--- title: "Jetion JT645SIk(B) Solar Panel: Specs & Datasheet | ComparePV" description: "Jetion JT645SIk(B) solar panel. Specs: 22.80% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/jetion-jt645sik-b" image: "https://comparepv.com/og/panel/jetion-jt645sik-b.png" updated: 2026-09-11 --- # Jetion JT645SIk(B) Solid all-round for its segment 78 panels in the segment HJT 600-650 W ## Identity - **Manufacturer:** Jetion - **Model:** JT645SIk(B) - **Series:** JT SIk(B) - **Rated power:** 645 W - **Cell technology:** HJT - **Bifacial:** yes ## How it compares Compared against segment HJT 600-650 W (78 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 645 W | 625 W | Strong - top 3% | | | Module efficiency | 22.80% | 22.60% | Typical | 2,769 | | Power density | 227.9 | 226.0 | Typical | 2,828 | | Temperature coefficient | -0.240 | -0.240 | Typical | 13 | | Weight (kg) | 35.3 kg | 33.6 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.80% | 22.60% | Typical | 2,769 | | Power density | 227.9 | 226.0 | Typical | 2,828 | | Temperature coefficient | -0.240 | -0.240 | Typical | 13 | | Weight per kWp | 54.7 | 54.7 | Typical | 9,218 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Utility-scale, commercial and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 645 W - **Efficiency:** 22.80 % - **Voltage at Pmax (Vmp):** 38.45 V - **Current at Pmax (Imp):** 16.78 A - **Open-circuit voltage (Voc):** 45.55 V - **Short-circuit current (Isc):** 17.58 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:** HJT - **Cell count:** 120 - **Bifacial:** yes - **Bifacial gain:** 30.00 ### Physical - **Length:** 2172 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 35.3 kg - **Area:** 2.83 m2 - **Power density:** 227.9 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 | 2769 of 14129 | | Power density | 2828 of 14129 | | Temperature coefficient | 13 of 14129 | | Weight | 9218 of 14129 | | Warranty | 21 of 14129 | ## Pros - **HJT technology with N-type cells** - The HJT heterojunction combines N-type silicon with thin-film layers, delivering a low temperature coefficient and strong resistance to LID/PID degradation. The series' 22.3-23% efficiency places it in the premium N-type segment. - **Bifacial dual-glass construction** - The dual-glass design captures reflected light for additional energy yield, particularly effective in ground-mount installations and on bright/reflective rooftop surfaces. - **120 half-cut cells in multi-busbar layout** - Half-cut cells combined with multi-busbar interconnection reduce resistive losses and improve partial-shading tolerance, resulting in more stable output under low-irradiance conditions. - **Tier-1, BNEF-certified manufacturer** - Jetion Solar (founded 2004, affiliated with the CNBM group) is listed on the BloombergNEF Tier 1 Module Maker Tiering System, easing project financing for banks and institutional investors. - **Long-term 30-year power warranty** - A 15-year product warranty combined with a 30-year linear power warranty supports predictable ROI, important for commercial projects and utility-scale PV farms with long investment horizons. ## Cons - **Efficiency trails top HJT peers** - Maximum efficiency of 23% is lower than comparable same-power modules: Hanersun Hitouch 6N reaches 24.1%, Astronergy ASTRO N5 23.3%, and BYD AURO N NLBK-39 23.25%. The ~1.1pp gap versus the segment leader means lower power density per unit of roof area. ## About this series The JT SIk(B) series consists of dual-glass monocrystalline modules built around **HJT heterojunction technology**, combining a thin-film structure with N-type silicon in high-performance cells. The use of 120 **half-cut cells** arranged in a multi-busbar layout reduces resistive losses and ensures a more even current distribution across the panel surface. Thanks to its **bifacial design**, the module also captures light reflected from the ground, delivering additional energy yield in installations over bright surfaces, reflective roofing, or ground-mounted systems. The series also stands out for strong performance under low-light conditions - mornings, evenings, and overcast days - making it an attractive choice for investors seeking stable year-round energy production. A **low temperature coefficient** limits power losses on hot days, while resistance to LID and PID degradation extends the installation's real-world lifespan. The dual-glass construction increases the panel's mechanical resistance to snow and wind loads and improves durability in harsh weather conditions. This solution is dedicated to both commercial installations and large-scale solar farms, where long-term reliability and predictable return on investment matter most. ## Notable figures - Efficiency of 22.8% matches the \*\*HJT 600-650W\*\* median - Power density of 227.9 W/m² matches the \*\*HJT 600-650W\*\* median - Temperature coefficient of -0.24%/°C matches the \*\*HJT 600-650W\*\* median - At 35.3 kg, this panel is 1.7 kg heavier than the \*\*HJT 600-650W\*\* median (33.6 kg) - more demanding for installation crews - Bifacial design (85% factor) captures reflected light - adds 4-13% yield on ground-mount or white roof ## Questions ### How does the HJT technology used in the Jetion JT SIk(B) differ from standard PERC panels? HJT (heterojunction) technology combines N-type monocrystalline silicon with thin amorphous silicon layers, reducing carrier recombination and boosting cell efficiency. Compared to PERC, HJT panels have a lower temperature coefficient, higher resistance to LID and PID degradation, and better performance under low irradiance, resulting in higher annual energy yield. ### Are the 650 Wp Jetion JT SIk(B) panels suitable for large ground-mounted installations? Yes, power output up to 650 Wp combined with bifacial technology makes this series particularly attractive for solar farms and commercial installations. The dual-sided design captures reflected light from bright surfaces, such as gravel or reflective foil, increasing total energy yield by up to several percent compared to monofacial modules. ### What is the manufacturer's warranty on Jetion JT SIk(B) panels? The panels come with a 15-year product warranty covering material and workmanship defects, plus a 30-year power warranty guaranteeing a defined output level throughout that period. This is one of the longest warranty periods currently available on the market, reflecting the manufacturer's confidence in HJT technology durability. ### Does the glass-glass construction of Jetion JT SIk(B) panels improve snow load resistance? Yes, the double-glass (glass-glass) construction significantly increases the module's mechanical rigidity compared to standard glass-backsheet designs. This improves resistance to snow and wind loads while providing better protection against moisture ingress, extending the real-world lifespan of the installation, especially in harsher climates. ### Do Jetion JT SIk(B) panels perform well under low-light conditions, such as cloudy days? Yes, this is one of the key strengths of the HJT technology used in this series. The heterojunction structure captures diffuse and weak sunlight more efficiently than conventional PERC cells, allowing the panels to generate energy in early morning, late afternoon, and cloudy conditions, delivering more consistent production year-round. ### Is Jetion a Tier 1 manufacturer and where are the JT SIk(B) panels produced? Yes, Jetion holds Tier 1 manufacturer status, indicating strong financial stability, long-standing production experience, and warranty reliability confirmed by independent bankability assessments. The JT SIk(B) series is manufactured in China, home to the company's main production facilities using advanced HJT technology lines. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/35c89f7d1c194531a3aca85ba1041bc1-ebd410b14138.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Hotter, lighter, +2.4 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +35 W, lighter, +2.4 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +30 W, lighter, +2.2 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Hotter, lighter, +2.2 pp | | [WINAICO WST-675BKX72-A2](https://comparepv.com/panel/winaico-wst-675bkx72-a2) | 675 W | +30 W, lighter, +2.2 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +50 W, hotter, +2.1 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +25 W, lighter, +2.0 pp | | [Jetion JT630SIk(B)](https://comparepv.com/panel/jetion-jt630sik-b) | 630 W | -15 W, -0.5 pp | | [Jetion JT635SIk(B)](https://comparepv.com/panel/jetion-jt635sik-b) | 635 W | -10 W, -0.4 pp | | [Jetion JT640SIk(B)](https://comparepv.com/panel/jetion-jt640sik-b) | 640 W | Very close match | | [Jetion JT650SIk(B)](https://comparepv.com/panel/jetion-jt650sik-b) | 650 W | Very close match | | [Gamko New Energy GKA210N120](https://comparepv.com/panel/gamko-new-energy-gka210n120) | 680 W | Hotter, lighter, +1.2 pp | | [Gamko New Energy GKA210N120-675](https://comparepv.com/panel/gamko-new-energy-gka210n120-675) | 675 W | Hotter, lighter, +1.1 pp | | [Q-SUN Solar QN-670HJT-01](https://comparepv.com/panel/q-sun-solar-qn-670hjt-01) | 670 W | +25 W, +0.9 pp | | [Gamko New Energy GKA210N120-670](https://comparepv.com/panel/gamko-new-energy-gka210n120-670) | 670 W | Hotter, lighter, +0.9 pp | | [Q-SUN Solar QN-665HJT-01](https://comparepv.com/panel/q-sun-solar-qn-665hjt-01) | 665 W | +20 W, +0.7 pp | --- Source: https://comparepv.com/panel/jetion-jt645sik-b 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.