--- title: "WINAICO WST-625NHX66-A4 Solar Panel: Specs & Datasheet | ComparePV" description: "WINAICO WST-625NHX66-A4 solar panel. Specs: 23.10% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/winaico-wst-625nhx66-a4" image: "https://comparepv.com/og/panel/winaico-wst-625nhx66-a4.png" updated: 2026-10-23 --- # WINAICO WST-625NHX66-A4 Light for its output, no clear weak spot 78 panels in the segment HJT 600-650 W ## Identity - **Manufacturer:** WINAICO - **Model:** WST-625NHX66-A4 - **Series:** WST-NHX66-A4 Series - **Rated power:** 625 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) | 625 W | 625 W | Typical | | | Module efficiency | 23.10% | 22.60% | Typical | 1,617 | | Power density | 231.4 | 226.0 | Strong - top 25% | 1,558 | | Temperature coefficient | -0.240 | -0.240 | Typical | 13 | | Weight (kg) | 32.6 kg | 33.6 kg | Strong - top 15% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.10% | 22.60% | Typical | 1,617 | | Power density | 231.4 | 226.0 | Strong - top 25% | 1,558 | | Temperature coefficient | -0.240 | -0.240 | Typical | 13 | | Weight per kWp | 52.2 | 54.7 | Strong - top 15% | 5,666 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **52.2 kg per kWp** - Top 15% of the HJT 600-650 W segment, against a median of 54.7. - **231.4 watts per square metre** - Top 25% of the HJT 600-650 W segment, against a median of 226.0. - **Best for:** Utility-scale. ## Specification ### Electrical - **Rated power (Pmax):** 625 W - **Efficiency:** 23.10 % - **Voltage at Pmax (Vmp):** 41.14 V - **Current at Pmax (Imp):** 15.21 A - **Open-circuit voltage (Voc):** 49.25 V - **Short-circuit current (Isc):** 16.06 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.240 %/degC - **Temperature coefficient of Voc:** -0.220 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 44 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:** 32.6 kg - **Area:** 2.70 m2 - **Power density:** 231.4 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:** 564 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 1617 of 14129 | | Power density | 1558 of 14129 | | Temperature coefficient | 13 of 14129 | | Weight | 5666 of 14129 | | Warranty | 21 of 14129 | ## About this series The WINAICO WST-NHX66-A4 series is engineered for utility-scale installations, where every kilowatt-hour produced over the project lifetime matters. At its core are cells built on **heterojunction (HJT) technology**, combining N-type monocrystalline silicon with a thin amorphous layer, giving the module better performance in high-temperature conditions than conventional PERC or TOPCon designs. The panel is fully **bifacial**, and its **high bifaciality factor** allows meaningful energy gains from light reflected off the ground surface, a particularly valuable trait for ground-mount arrays and tracker systems. Its **glass-glass construction**, with tempered glass on both sides, boosts mechanical durability and long-term resilience, reducing the risk of microcracks and laminate degradation. The series is also distinguished by very **low power degradation** across its operating lifetime, delivering stable energy output throughout the linear performance warranty period. It is built for investors and developers of solar farm projects who demand high reliability, predictable LCOE, and resistance to demanding climatic conditions. ## Notable figures - Efficiency of 23.1% matches the \*\*HJT 600-650W\*\* median - 231.4 W/m² power density - 5.4 W/m² more than \*\*HJT 600-650W\*\* median (226.0 W/m²), more power per roof area - Temperature coefficient of -0.24%/°C matches the \*\*HJT 600-650W\*\* median - At 32.6 kg, weight matches the \*\*HJT 600-650W\*\* median - 90% bifaciality enables rear-side power generation, boosting yield by 4-14% on reflective surfaces ## Questions ### How does HJT cell technology in WINAICO WST-NHX66-A4 panels differ from classic PERC or TOPCon cells? HJT cells combine N-type monocrystalline silicon with a thin amorphous layer, resulting in a lower temperature coefficient than PERC or TOPCon. In practice, this means a smaller power drop during heat and higher energy yield in warm climates or on roofs with poor ventilation where modules heat up significantly. ### Does the bifacial design of the WST-NHX66-A4 modules deliver a real energy gain on a typical PV plant? Yes, the high bifaciality factor of this series lets the module capture light reflected from the ground, grass, or light-colored surfaces beneath it. The biggest gains come from ground-mount installations and trackers with elevated racking and bright ground cover, where additional rear-side generation can meaningfully increase the plant's annual energy yield. ### What warranty comes with WINAICO WST-NHX66-A4 panels, and what does the linear power warranty cover? The series carries a 15-year product warranty along with a 30-year linear power warranty. The linear warranty guarantees a slow, predictable year-over-year decline in module output, resulting in stable and forecastable energy yield across the entire financing period of a solar plant project. ### Does the glass-glass construction of the WST-NHX66-A4 improve durability compared to a standard glass-foil panel? Yes, tempered glass on both sides replaces the rear polymer backsheet, improving mechanical strength, reducing the risk of cell microcracks, and protecting against laminate degradation and moisture ingress. This helps the module better withstand snow loads, hail, and thermal cycling over the long-term operation of utility-scale installations. ### What type of projects is the WINAICO WST-NHX66-A4 series, rated up to 630 Wp, best suited for? The series is designed primarily for utility-scale installations, solar farms, and developer projects where low LCOE and long-term reliability are critical. The high module power of up to 630 Wp reduces the number of panels needed to reach a given plant capacity, lowering racking, cabling, and installation labor costs. ### Is WINAICO, as a Taiwan-based manufacturer, a reliable supplier for large-scale solar projects? WINAICO is a tier 1 manufacturer headquartered in Taiwan, meaning strong financial standing and decades of experience producing high-quality modules trusted by banks and investors when assessing project bankability. Tier 1 status increases confidence in the manufacturer's ability to honor long-term warranties and provide service support for utility-scale installations. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/WINAICO_WST-630NHX66-A4_AUS_CEC_1224-ce4e478b2fb1.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +25 W, lighter, +2.1 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +50 W, lighter, +1.9 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Hotter, lighter, +1.9 pp | | [WINAICO WST-675BKX72-A2](https://comparepv.com/panel/winaico-wst-675bkx72-a2) | 675 W | +50 W, hotter, +1.9 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +45 W, lighter, +1.7 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +45 W, lighter, +1.7 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Hotter, lighter, +1.7 pp | | [WINAICO WST-630NHX66-A4](https://comparepv.com/panel/winaico-wst-630nhx66-a4) | 630 W | Very close match | | [WINAICO WST-665BKX72-A2](https://comparepv.com/panel/winaico-wst-665bkx72-a2) | 665 W | +40 W, hotter, +1.5 pp | | [WINAICO WST-670BKX72-A2](https://comparepv.com/panel/winaico-wst-670bkx72-a2) | 670 W | +45 W, hotter, +1.7 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +55 W, lighter, +2.1 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +75 W, hotter, +1.9 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +70 W, hotter, +1.8 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +45 W, hotter, +1.7 pp | --- Source: https://comparepv.com/panel/winaico-wst-625nhx66-a4 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.