--- title: "Solarspace SS9-66HD-690N 690W Solar Panel - Specs & Review | ComparePV" description: "Solarspace SS9-66HD-690N 690W solar panel. Specs: 22.21% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/solarspace-ss9-66hd-690n" updated: 2026-09-11 --- # Solarspace SS9-66HD-690N Middle of its segment, heavy for its output 109 panels in the segment N-type 650-700 W ## Identity - **Manufacturer:** Solarspace - **Model:** SS9-66HD-690N - **Series:** SS9-66HD 670-690N - **Rated power:** 690 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) | 690 W | 660 W | Strong - top 14% | | | Module efficiency | 22.21% | 23.30% | Typical | 5,754 | | Power density | 222.1 | 233.2 | Typical | 5,734 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 37.5 kg | 33.5 kg | Weak - bottom 22% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.21% | 23.30% | Typical | 5,754 | | Power density | 222.1 | 233.2 | Typical | 5,734 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 54.3 | 50.9 | Weak - bottom 22% | 8,655 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **54.3 kg per kWp** - Bottom 22% of the N-type 650-700 W segment, against a median of 50.9. - **Best for:** Utility-scale, commercial, hot-climate and shaded-installations. - **Not ideal for:** Weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 690 W - **Efficiency:** 22.21 % - **Voltage at Pmax (Vmp):** 40.10 V - **Current at Pmax (Imp):** 17.21 A - **Open-circuit voltage (Voc):** 47.80 V - **Short-circuit current (Isc):** 18.24 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.260 %/degC - **Temperature coefficient of Isc:** 0.045 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 132 - **Bifacial:** yes ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 33 mm - **Weight:** 37.5 kg - **Area:** 3.11 m2 - **Power density:** 222.1 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 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:** 603 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 5754 of 14005 | | Power density | 5734 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 8655 of 14005 | | Warranty | 21 of 14005 | ## About this series The Solarspace SS9-66HD 670-690N series is designed to maximize energy production from a given surface area - these modules make it easier to design installations where every square meter of roof or ground counts. The use of **N-TOPCon cells** results in more stable performance over time and better utilization of solar radiation, even in less sunny conditions. This is particularly important in Poland, where weather can be unpredictable, and investors expect predictable returns. The **bifacial dual-glass** construction helps to increase production by working with both sides, while also enhancing the module's resistance to environmental factors. Another advantage is the **low degradation** typical of N-type technology, as well as the **favorable temperature coefficient**, which limits power losses in hot weather. This series is ideal for PV farms, large commercial rooftops, and anywhere where the goal is to maximize production and ensure long-term investment profitability. ## Notable figures - Efficiency of 22.2% is 1.1pp below the \*\*N-type 650-700W\*\* median (23.3%) - At 222.1 W/m², this panel generates 11.1 W/m² less per unit area than \*\*N-type 650-700W\*\* median (233.2 W/m²) - At -0.29%/°C, hot weather performance is typical for \*\*N-type 650-700W\*\* panels - At 37.5 kg, this panel is 4.0 kg heavier than the \*\*N-type 650-700W\*\* median (33.5 kg) - more demanding for installation crews - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface ## Questions ### What is the maximum power output of the Solarspace SS9-66HD 670-690N module and what does it mean in practice? The top variant in the series reaches a peak power of 690 Wp. This means more energy can be harvested from the same roof or ground area compared to older PERC modules of similar dimensions. The series spans 670 to 690 Wp, allowing system designers to match the exact power class to the project requirements without adding extra panels. ### What warranty does Solarspace provide on the SS9-66HD 670-690N series? Solarspace offers a 12-year product warranty covering manufacturing defects and material failures, along with a 30-year linear power output warranty. The extended power warranty is standard for N-type technology and means the manufacturer guarantees a defined minimum performance level for three decades — a key factor when calculating the long-term LCOE of the installation. ### What is N-TOPCon technology in the SS9-66HD series and how does it compare to PERC? N-TOPCon (Tunnel Oxide Passivated Contact) uses N-type silicon cells with a passivated tunnel oxide layer. Compared to PERC, it delivers higher efficiency, lower annual degradation (below 1% in year one), and better performance under low-irradiance conditions. The result is a higher annual energy yield from the same surface area and a slower long-term power loss over the module's lifetime. ### Does the bifacial dual-glass design of the SS9-66HD 670-690N actually boost energy production? Yes. The bifacial design captures both direct irradiance and light reflected off the ground or mounting surface. In ground-mount installations with light-colored albedo or on rooftops with white membranes, this typically adds 5–15% additional energy yield. The dual-glass encapsulation (replacing a standard backsheet) also improves resistance to moisture ingress, ammonia exposure, and mechanical stress. ### Do the Solarspace SS9-66HD 670-690N panels perform well in climates with frequent cloudy days? Yes. The temperature coefficient of Pmax is approximately -0.29%/°C, reducing power losses on hot days compared to older technologies. More importantly, N-TOPCon cells have an enhanced low-irradiance response, which improves performance on overcast days — a significant advantage in Central and Northern European markets where diffuse radiation represents a large share of annual irradiance. ### What types of installations are the Solarspace SS9-66HD 670-690N modules best suited for? The series is designed for utility-scale PV farms, large commercial rooftops, and industrial installations where maximizing energy yield per unit of area and long-term return on investment are the primary goals. Due to the large module footprint and weight of approximately 35 kg typical of dual-glass construction, professional installation by experienced crews is recommended, making it less ideal for small residential rooftop systems. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/ss9-66hd-n-1-9795e83f2a5a.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | -40 W, lighter, +3.0 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, lighter, +3.0 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, lighter, +2.8 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | -45 W, lighter, +2.8 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | Cooler, lighter, +2.8 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | Cooler, lighter, +2.7 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +2.6 pp | | [Solarspace SS9-66HD-645M](https://comparepv.com/panel/solarspace-ss9-66hd-645m) | 645 W | -45 W, hotter, -1.4 pp | | [Solarspace SS9-66HD-650M](https://comparepv.com/panel/solarspace-ss9-66hd-650m) | 650 W | -40 W, hotter, -1.3 pp | | [Solarspace SS9-66HD-655M](https://comparepv.com/panel/solarspace-ss9-66hd-655m) | 655 W | -35 W, hotter, -1.1 pp | | [Solarspace SS9-66HD-660M](https://comparepv.com/panel/solarspace-ss9-66hd-660m) | 660 W | -30 W, hotter, -1.0 pp | | [Solarspace SS9-66HD-665M](https://comparepv.com/panel/solarspace-ss9-66hd-665m) | 665 W | -25 W, hotter, -0.8 pp | | [Solarspace SS9-66HD-670M](https://comparepv.com/panel/solarspace-ss9-66hd-670m) | 670 W | -20 W, hotter, -0.6 pp | | [Solarspace SS9-66HD-675N](https://comparepv.com/panel/solarspace-ss9-66hd-675n) | 675 W | -15 W, -0.5 pp | | [Solarspace SS9-66HD-680N](https://comparepv.com/panel/solarspace-ss9-66hd-680n) | 680 W | -10 W, -0.3 pp | | [Solarspace SS9-66HD-685N](https://comparepv.com/panel/solarspace-ss9-66hd-685n) | 685 W | Very close match | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +115 W, cooler, +2.9 pp | --- Source: https://comparepv.com/panel/solarspace-ss9-66hd-690n 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.