--- title: "HT-SAAE HT66-18X(ND)-F 600W 600W Solar Panel - Specs & Review | ComparePV" description: "HT-SAAE HT66-18X(ND)-F 600W 600W solar panel. Specs: 22.20% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ht-saae-ht66-18x-nd-f-600w" updated: 2026-09-11 --- # HT-SAAE HT66-18X(ND)-F 600W Middle of its segment, weak in heat 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** HT-SAAE - **Model:** HT66-18X(ND)-F 600W - **Series:** HT66-18X(ND)-F - **Rated power:** 600 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 600-650 W (1086 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 600 W | 620 W | Weak - bottom 5% | | | Module efficiency | 22.20% | 22.80% | Weak - bottom 12% | 5,817 | | Power density | 222.1 | 227.7 | Weak - bottom 13% | 5,783 | | Temperature coefficient | -0.310 | -0.290 | Weak - bottom 4% | 8,005 | | Weight (kg) | 33.5 kg | 32.7 kg | Weak - bottom 8% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.20% | 22.80% | Weak - bottom 12% | 5,817 | | Power density | 222.1 | 227.7 | Weak - bottom 13% | 5,783 | | Temperature coefficient | -0.310 | -0.290 | Weak - bottom 4% | 8,005 | | Weight per kWp | 55.8 | 53.1 | Weak - bottom 8% | 10,218 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### 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. - **55.8 kg per kWp** - Bottom 8% of the TOPCon 600-650 W segment, against a median of 53.1. Ranked 10,218th in the whole database. - **22.20% module efficiency** - Bottom 12% of the TOPCon 600-650 W segment, against a median of 22.80%. - **Best for:** Commercial, utility-scale and shaded-installations. - **Not ideal for:** Hot climates, weight-limited structures and tight roof space. ## Specification ### Electrical - **Rated power (Pmax):** 600 W - **Efficiency:** 22.20 % - **Voltage at Pmax (Vmp):** 39.40 V - **Current at Pmax (Imp):** 15.23 A - **Open-circuit voltage (Voc):** 47.50 V - **Short-circuit current (Isc):** 15.95 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 - **Bifacial:** yes ### Physical - **Length:** 2382 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 33.5 kg - **Area:** 2.70 m2 - **Power density:** 222.1 Wp/m2 ### Warranty and degradation - **Product warranty:** 30 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 524 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 5817 of 14005 | | Power density | 5783 of 14005 | | Temperature coefficient | 8005 of 14005 | | Weight | 10218 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Up to 23% Efficiency – Top-Tier Performance** - The highest-efficiency variant in the series reaches 23% module efficiency, matching direct competitors (Weran Solar LR7-72HTH 23%, Astronergy ASTRO N7 23%). Lower-tier variants (22.2%) still rank within the top 15% of the 600+ Wp module market. - **Low Temperature Coefficient of Pmax** - The rated value of -0.31%/°C (per HT-SAAE datasheet) is more favorable than typical PERC modules (-0.35%/°C), translating into measurably higher energy yield on heated rooftops and utility-scale PV plants during summer peak hours. - **30-Year Power Warranty with Max. 0.45%/Year Degradation** - The manufacturer guarantees ≥87.4% of nominal power after 30 years, with annual degradation ≤0.45% from year 2 onward. The mainstream market standard (JA Solar, Trina) is 25 years at 84.8%; HT-SAAE extends this by 5 years while maintaining a higher end-of-life power floor. - **PV Top Performers 2024 – 7/7 Test Categories** - The series earned a PV Top Performers distinction (2024) across all 7 performance categories: thermal cycling, damp heat, mechanical stress, hail stress, PID, LID+LETID, and PAN performance — validated by independent third-party testing, not solely manufacturer claims. - **Mechanical Load Rating: 5,400 Pa Front / 2,400 Pa Rear** - The module withstands dynamic loads of 5,400 Pa (front) and 2,400 Pa (rear), exceeding the IEC 61215 industry baseline of 4,000/2,400 Pa. This is particularly relevant for utility-scale PV sites in high snow- and wind-load zones, as well as tracker-mounted systems. ## Cons - **15-Year Product Warranty for Ground-Mounted Systems** - The full 30-year product warranty applies exclusively to rooftop installations. For ground-mounted systems — the primary target market for this series — the manufacturer limits product warranty coverage to 15 years. This means modules may fall outside product warranty protection at the midpoint of a typical utility-scale plant's operational life. - **Installation Prohibited Within 500 m of the Coastline** - HT-SAAE warranty terms exclude installations located less than 500 m from the sea, restricting the series' applicability in coastal and island projects. Some competitors (e.g., Astronergy) offer dedicated marine-grade variants without this limitation. ## About this series The HT-SAAE HT66-18X(ND)-F series solar panel is designed for installations prioritizing long-term high energy production, even in challenging environmental conditions. Utilizing **N-type TOPCon cells** reduces susceptibility to light-induced degradation, helping maintain stable module performance over an extended lifespan. The **double glass (dwuszybowa)** construction enhances weather resistance and minimizes risks associated with microcracks, which is crucial for large rooftop and ground installations. Thanks to **half-cut technology**, the panel performs better under partial shading and minimizes internal losses, while efficiently dissipating heat, supporting operational safety. An additional advantage is **bifacial operation**, enabling the use of reflected light from the ground where conditions permit. This makes it an excellent choice for utility-scale PV farms and commercial/industrial projects where longevity and predictable energy yield are key. ## Notable figures - Efficiency of 22.2% is 0.6pp below the \*\*TOPCon 600-650W\*\* median (22.8%) - 222.1 W/m² power density is 5.6 W/m² below \*\*TOPCon 600-650W\*\* median (227.7 W/m²) - requires larger installation area - At -0.31%/°C, loses 0.02pp more power per degree than \*\*TOPCon 600-650W\*\* median (-0.29%/°C) - Bifacial design (74% factor) captures reflected light - adds 4-11% yield on ground-mount or white roof - In the top 42% for efficiency among all TOPCon panels ## Questions ### What efficiency do the HT-SAAE HT66-18X(ND)-F panels achieve, and what does TOPCon technology deliver? The HT66-18X(ND)-F series reaches module efficiency of up to 23%, placing it among the top-performing panels in its class. N-type TOPCon cells offer lower susceptibility to light-induced degradation (LID) and a favorable temperature coefficient of -0.31%/°C. This means the panels lose less power on hot days compared to older PERC cells, maintaining more stable output throughout the day and across years of operation. ### What are the product and power warranties for the HT-SAAE HT66-18X(ND)-F series? The manufacturer provides a 30-year product warranty covering material and workmanship defects, along with a 30-year linear power warranty. After 30 years, the panel should retain at least 87.4% of its rated power output, with an annual degradation rate of just 0.4%. This is among the lowest degradation figures in its price segment, backed by TÜV Rheinland certification. ### Are the HT-SAAE HT66-18X(ND)-F 620W panels suitable for utility-scale solar farms or large ground-mounted installations? Yes, the HT66-18X(ND)-F series is designed primarily for utility-scale PV farms and commercial projects. Modules rated up to 620 W combined with a front mechanical load tolerance of 5,400 Pa allow dense power packing per land area. The double glass construction reduces microcrack risk during installation and long-term outdoor operation, which is critical in large-scale projects where every service call carries significant cost. ### Does the bifacial design of the HT-SAAE HT66-18X(ND)-F actually increase energy yield? Yes, though the gain depends on installation conditions. On a light-colored surface or with a white ballast sheet beneath the modules, bifacial operation can increase annual yield by 5–15% compared to a monofacial module. Both sides of the HT66-18X(ND)-F actively collect light reflected from the ground. The bifacial gain is most pronounced in ground-mounted installations with a higher tilt angle and a high-albedo surface below. ### How does the HT-SAAE HT66-18X(ND)-F series handle partial shading from chimneys, dormers, or nearby trees? Half-cut cell technology splits each cell in two, so under partial shading only a portion of the module's power is lost rather than an entire string. Smaller cells also generate less heat, reducing hot-spot risk. For installations with obstructions such as chimneys, roof windows, or nearby vegetation, this translates into a measurably higher annual energy yield compared to panels using full-size cells. ### What mechanical load and hail resistance do the HT-SAAE HT66-18X(ND)-F panels offer? The HT66-18X(ND)-F series is certified for a front mechanical load of 5,400 Pa and a rear load of 2,400 Pa, equivalent to heavy snow accumulation and strong wind pressure. The modules are also rated for hail impact from 25 mm diameter hailstones at 23 m/s. The double glass construction provides additional protection against moisture ingress and corrosion, making it especially relevant for coastal, high-altitude, or severe-weather installations. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/ht66-18xnd-f-615-au-38ec4c41f656.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +50 W, lighter, +3.0 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +2.8 pp | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, lighter, +2.6 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +2.6 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, lighter, +2.4 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | Cooler, lighter, +2.4 pp | | [HT-SAAE HT66-18X(ND)-F 605W](https://comparepv.com/panel/ht-saae-ht66-18x-nd-f-605w) | 605 W | Very close match | | [HT-SAAE HT66-18X(ND)-F 610W](https://comparepv.com/panel/ht-saae-ht66-18x-nd-f-610w) | 610 W | +10 W, +0.4 pp | | [HT-SAAE HT66-18X(ND)-F 615W](https://comparepv.com/panel/ht-saae-ht66-18x-nd-f-615w) | 615 W | +15 W, +0.6 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +80 W, cooler, +3.0 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +75 W, cooler, +2.8 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +100 W, cooler, +2.8 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +95 W, cooler, +2.7 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +70 W, lighter, +2.6 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +70 W, lighter, +2.6 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +70 W, cooler, +2.6 pp | --- Source: https://comparepv.com/panel/ht-saae-ht66-18x-nd-f-600w 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.