--- title: "HT-SAAE HT66-18X(N)-625W 625W Solar Panel - Specs & Review | ComparePV" description: "HT-SAAE HT66-18X(N)-625W 625W solar panel. Specs: 23.10% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ht-saae-ht66-18x-n-625w" updated: 2026-09-11 --- # HT-SAAE HT66-18X(N)-625W Light for its output, weak in heat 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** HT-SAAE - **Model:** HT66-18X(N)-625W - **Series:** HT66-18X(N) - **Rated power:** 625 W - **Cell technology:** TOPCon ## How it compares Compared against segment TOPCon 600-650 W (1086 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 625 W | 620 W | Typical | | | Module efficiency | 23.10% | 22.80% | Typical | 1,570 | | Power density | 231.4 | 227.7 | Typical | 1,513 | | Temperature coefficient | -0.310 | -0.290 | Weak - bottom 4% | 8,005 | | Weight (kg) | 29.0 kg | 32.7 kg | Strong - top 9% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.10% | 22.80% | Typical | 1,570 | | Power density | 231.4 | 227.7 | Typical | 1,513 | | Temperature coefficient | -0.310 | -0.290 | Weak - bottom 4% | 8,005 | | Weight per kWp | 46.4 | 53.1 | Strong - top 9% | 1,141 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **46.4 kg per kWp** - Top 9% of the TOPCon 600-650 W segment, against a median of 53.1. Ranked 1,141st in the whole database. ### Watch out for - **-0.310 %/°C temperature coefficient** - Bottom 4% of the TOPCon 600-650 W segment, against a median of -0.290. Ranked 8,005th in the whole database. - **Best for:** Commercial, utility-scale and shaded-installations. - **Not ideal for:** Hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 625 W - **Efficiency:** 23.10 % - **Voltage at Pmax (Vmp):** 40.40 V - **Current at Pmax (Imp):** 15.48 A - **Open-circuit voltage (Voc):** 48.50 V - **Short-circuit current (Isc):** 16.20 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.310 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.046 %/degC - **NOCT:** 43 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 132 ### Physical - **Length:** 2382 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 29.0 kg - **Area:** 2.70 m2 - **Power density:** 231.4 Wp/m2 ### Warranty and degradation - **Product warranty:** 30 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:** 546 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 1570 of 14005 | | Power density | 1513 of 14005 | | Temperature coefficient | 8005 of 14005 | | Weight | 1141 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Temperature Coefficient of –0.31 %/°C** - N-type TOPCon cells achieve –0.31 %/°C for Pmax, a clear advantage over PERC technology (typically –0.35 to –0.40 %/°C). In real-world conditions where modules routinely reach 60–70 °C during summer, this difference translates into several additional percentage points of annual energy yield compared to older technologies. - **30-Year Power Warranty at ≥87.4%** - The manufacturer guarantees ≥87.4% of nominal power output after 30 years, with a linear annual degradation rate of 0.40% (1.0% in year one), as specified in the series datasheets. Most comparable Tier-1 models — such as the Leapton LP182\*199-M-72-NH — offer standard 25-year power warranties, making this series more attractive for projects with long financing horizons. - **Efficiency Up to 23.3% — Top-Tier Performance** - The maximum efficiency of 23.3% matches the Canadian Solar TOPBiHiKu6 Anti-Dust (23.3%) and the Jinko Tiger Neo 66HL4M-BDV (23.32%), and exceeds the Leapton LP182\*199-M-72-NH (22.54%) by more than 0.75 percentage points. This high power density allows more watts to be installed within a constrained rooftop or ground-mount area. - **Tier-1 Manufacturer, State-Owned Enterprise Since 1998** - HT-SAAE (Shanghai Aerospace Automobile Electromechanical Co., Ltd.) is a state-owned enterprise with a 26-year track record, classified as Tier-1 bankable by BNEF. This designation confirms that the modules have been financed by independent commercial banks in at least six projects exceeding 10 MW, reducing credit and warranty risk for institutional investors. - **PID Resistance and Half-Cut Cell Architecture** - The half-cut architecture (132 cells) reduces partial-shading losses and lowers internal resistance — a tangible benefit on rooftops with parapets or chimneys. Certified resistance to PID (Potential Induced Degradation) is critical for 1500 V DC systems, for which this module is officially rated. ## Cons - **Monofacial Module — No Bifacial Yield Gain** - The HT66-18X(N) series is monofacial (is\_bifacial: false), while two key peer comparables in the same power class — the Canadian Solar TOPBiHiKu6 Anti-Dust and the Jinko Tiger Neo 66HL4M-BDV — offer bifacial technology. In ground-mount installations (the primary target application per the manufacturer's description), albedo reflection can generate 5–15% additional annual energy yield that this module is unable to capture. ## About this series The HT-SAAE HT66-18X(N) series is designed for maximum energy production on large roof areas and ground-mounted installations, where long-term stability and consistent performance are key, rather than just the power rating specified in the catalog. The use of **N-type cells in TOPCon technology** results in very low susceptibility to degradation caused by light and temperature, making it easier to maintain predictable performance in Polish conditions. The module utilizes a **half-cut design**, which allows it to better handle partial shading and reduce internal losses - this is a significant advantage on roofs with obstructions, overhangs, or chimneys. Versions with **double glass** enhance resistance to moisture, mechanical stress, and material fatigue, which will be appreciated by investors who prioritize long-term durability. Furthermore, **PID resistance** and a refined connection architecture improve safety in demanding systems. This is the choice for companies, PV farms, and projects where minimizing risk and maximizing energy yield throughout the installation's lifespan are priorities. ## Notable figures - Efficiency of 23.1% matches the \*\*TOPCon 600-650W\*\* median - Power density of 231.4 W/m² packs 3.7 W/m² more into the same footprint vs \*\*TOPCon 600-650W\*\* median (227.7 W/m²) - Temperature coefficient of -0.31%/°C is 0.02pp worse than \*\*TOPCon 600-650W\*\* median (-0.29%/°C) - higher losses in summer heat - 29.0 kg weight - 3.7 kg lighter than \*\*TOPCon 600-650W\*\* median (32.7 kg), reducing installation effort - Ranked #1570 out of 14005 panels for efficiency in the database ## Questions ### What warranty does the HT-SAAE HT66-18X(N) series come with and what does it cover? The HT66-18X(N) series carries a 30-year product warranty and a 30-year power warranty. After 30 years of operation, the manufacturer guarantees at least 87.4% of rated output. This is one of the longer warranty standards available on the market — a significant advantage when evaluating the total LCOE of utility-scale or large commercial PV installations. ### Does TOPCon technology in the HT66-18X(N) series actually deliver higher yield than older PERC modules? Yes. N-type TOPCon cells offer higher efficiency — up to 23.3% for this series — and a lower temperature coefficient of Pmax at -0.31%/°C, compared to roughly -0.35%/°C for typical PERC modules. In practice, this means lower power losses on hot summer days and higher annual energy yield under the same irradiance conditions. ### How does the HT66-18X(N) perform under partial shading from a chimney or parapet wall? The HT66-18X(N) series uses a half-cut cell design with 132 cells, which splits each cell in two and limits the hot-spot effect. When one half of a module is shaded, the other half continues generating power without losses spreading across the full string. This is a tangible benefit on commercial rooftops with parapets, chimneys, or HVAC units. ### How does the HT66-18X(ND)-F double glass variant differ from the standard HT66-18X(N)? The ND-F variant replaces the rear backsheet with a second pane of tempered glass. The double glass construction improves moisture resistance and lowers water vapor transmission rate (WVTR), resulting in slower degradation in humid climates. The module is also more resistant to mechanical damage. The trade-off is higher weight, which must be factored into the design of roof or ground-mount racking systems. ### Do HT-SAAE HT66-18X(N) panels perform well in Polish weather conditions — winter, overcast skies, and snow loads? Yes. N-type TOPCon cells have low susceptibility to light-induced degradation (LID/LeTID), which stabilizes output throughout the module's lifetime. The low temperature coefficient (-0.31%/°C) limits summer losses, and the half-cut design improves production under diffuse light. The series is certified for mechanical loads up to 5400 Pa, meeting structural requirements for Polish climatic zones. ### Is the HT66-18X(N) series suitable for a residential rooftop, or is it designed for commercial and utility-scale projects? Modules rated up to 630 Wp with dimensions of approximately 2382×1134 mm are large and weigh roughly 29–34 kg, making installation on a typical single-family rooftop considerably more difficult. This series is designed primarily for commercial rooftops, large industrial buildings, and ground-mount PV farms, where larger modules translate into lower installation and wiring costs per kilowatt of installed capacity. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/ht66-18xn-615-630-au-2-402b583137ab.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +25 W, cooler, +2.1 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +50 W, cooler, +1.9 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +20 W, cooler, +1.9 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +45 W, cooler, +1.7 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +45 W, cooler, +1.7 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +1.7 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, cooler, +1.7 pp | | [HT-SAAE HT66-18X(ND)-F 600W](https://comparepv.com/panel/ht-saae-ht66-18x-nd-f-600w) | 600 W | -25 W, heavier, -0.9 pp | | [HT-SAAE HT66-18X(ND)-F 605W](https://comparepv.com/panel/ht-saae-ht66-18x-nd-f-605w) | 605 W | -20 W, heavier, -0.7 pp | | [HT-SAAE HT66-18X(ND)-F 610W](https://comparepv.com/panel/ht-saae-ht66-18x-nd-f-610w) | 610 W | -15 W, heavier, -0.5 pp | | [HT-SAAE HT66-18X(ND)-F 615W](https://comparepv.com/panel/ht-saae-ht66-18x-nd-f-615w) | 615 W | -10 W, heavier, -0.3 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +55 W, cooler, +2.1 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +75 W, heavier, +1.9 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +70 W, heavier, +1.8 pp | --- Source: https://comparepv.com/panel/ht-saae-ht66-18x-n-625w Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.