--- title: "Solarspace SS9-66HD-705N 705W Solar Panel - Specs & Review | ComparePV" description: "Solarspace SS9-66HD-705N 705W solar panel. Specs: 22.70% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/solarspace-ss9-66hd-705n" updated: 2026-09-11 --- # Solarspace SS9-66HD-705N Solid all-round for its segment 90 panels in the segment N-type 700-750 W ## Identity - **Manufacturer:** Solarspace - **Model:** SS9-66HD-705N - **Series:** SS9-66HD 680-710N - **Rated power:** 705 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 700-750 W (90 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 705 W | 710 W | Typical | | | Module efficiency | 22.70% | 22.88% | Typical | 3,307 | | Power density | 227.0 | 228.6 | Typical | 3,361 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 37.5 kg | 38.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.70% | 22.88% | Typical | 3,307 | | Power density | 227.0 | 228.6 | Typical | 3,361 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 53.2 | 53.5 | Typical | 7,016 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Utility-scale, commercial, hot-climate and cold-climate. ## Specification ### Electrical - **Rated power (Pmax):** 705 W - **Efficiency:** 22.70 % - **Voltage at Pmax (Vmp):** 40.70 V - **Current at Pmax (Imp):** 17.33 A - **Open-circuit voltage (Voc):** 48.40 V - **Short-circuit current (Isc):** 18.36 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:** 227.0 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 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:** 616 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 3307 of 14005 | | Power density | 3361 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 7016 of 14005 | | Warranty | 21 of 14005 | ## About this series The Solarspace SS9-66HD 680-710N series is designed for installations where maximizing power output per square meter and stable performance under varying conditions are paramount. These modules utilize **N-type monocrystalline** cells in TOPCon technology, which allows for better long-term performance and minimizes typical degradation-related losses. The use of a **dual-glass bifacial** construction helps to utilize reflected light from the ground, which effectively supports energy production on flat roofs, in PV farms, and on ground-mounted structures with reflective surfaces. In practice, this series addresses two common issues: fluctuations in power output under less-than-ideal sunlight and summer efficiency losses. This supports the **favorable temperature coefficient** characteristic of N-type modules. Furthermore, the robust construction and **high mechanical strength** make it easier to design installations in windy and snowy areas. The SS9-66HD is a choice for investors who want to extract more energy from the same area, without compromising durability. ## Notable figures - Efficiency of 22.7% matches the \*\*N-type 700-750W\*\* median - Power density of 226.9 W/m² matches the \*\*N-type 700-750W\*\* median - Temperature coefficient of -0.29%/°C matches the \*\*N-type 700-750W\*\* median - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces - #3307 for efficiency, #2165 for temperature performance out of 14005 panels ## Questions ### What is TOPCon technology and why does the Solarspace SS9-66HD 680-710N series use it? TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell technology where a thin tunnel oxide layer minimizes carrier recombination at the cell surface. For the SS9-66HD series, this translates to efficiency up to 22.86%, a lower annual degradation rate than conventional PERC technology, and better long-term power retention throughout the 30-year power warranty period. ### Are Solarspace SS9-66HD 680-710N panels suitable for utility-scale solar farms and flat rooftops? Yes, the SS9-66HD 680-710N series is purpose-built for these applications. Its bifacial dual-glass construction captures energy reflected from the ground surface, which pays off especially on light-colored gravel, soil, or white rooftop membranes. With peak power up to 710 Wp and efficiency exceeding 22%, the series delivers higher energy yield per square meter compared to standard monofacial modules. ### How do the SS9-66HD panels perform on hot summer days when module temperature rises? N-type TOPCon cells carry a more favorable temperature coefficient than standard PERC modules. For the SS9-66HD series it is -0.29%/°C, meaning lower power losses as temperature climbs. When a module heats up to 65-70°C on a summer afternoon, the SS9-66HD produces noticeably more energy than comparable P-type panels with a typical coefficient of -0.35%/°C. ### What warranty does the Solarspace SS9-66HD 680-710N carry and what does it cover? Solarspace backs the SS9-66HD 680-710N with a 15-year product warranty and a 30-year linear power warranty guaranteeing at least 87.4% of rated output after 30 years of operation. Solarspace holds Tier 1 manufacturer status, which confirms the financial stability needed to honor warranty claims over the module's full service life. ### Can the SS9-66HD 680-710N series withstand heavy snow loads and strong winds? Yes. The dual-glass construction — tempered glass on both front and rear instead of a polymer backsheet — significantly increases rigidity and mechanical strength. SS9-66HD modules are rated for a front-side mechanical load of 5,400 Pa and a rear-side load of 2,400 Pa. This corresponds to substantial snow accumulation and high wind pressure, making the series a reliable choice for demanding Central European climate zones. ### What power output and efficiency do Solarspace SS9-66HD panels deliver compared to standard PERC modules? The SS9-66HD series spans 680 to 710 Wp with cell efficiency up to 22.86%, versus the 20-21% efficiency range typical of PERC modules at 400-500 Wp. The higher efficiency means an SS9-66HD-based system generates significantly more energy from the same roof or ground area, directly reducing the LCOE over the system's lifetime. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/ss9-66hd-n-b008c9b450fd.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, lighter, +2.5 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | -30 W, lighter, +2.3 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | Cooler, lighter, +2.3 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | Cooler, lighter, +2.2 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | -35 W, lighter, +2.1 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | -35 W, lighter, +2.1 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | -35 W, lighter, +2.1 pp | | [Solarspace SS9-66HD-645M](https://comparepv.com/panel/solarspace-ss9-66hd-645m) | 645 W | -60 W, hotter, -1.9 pp | | [Solarspace SS9-66HD-650M](https://comparepv.com/panel/solarspace-ss9-66hd-650m) | 650 W | -55 W, hotter, -1.8 pp | | [Solarspace SS9-66HD-655M](https://comparepv.com/panel/solarspace-ss9-66hd-655m) | 655 W | -50 W, hotter, -1.6 pp | | [Solarspace SS9-66HD-660M](https://comparepv.com/panel/solarspace-ss9-66hd-660m) | 660 W | -45 W, hotter, -1.4 pp | | [Solarspace SS9-66HD-665M](https://comparepv.com/panel/solarspace-ss9-66hd-665m) | 665 W | -40 W, hotter, -1.3 pp | | [Solarspace SS9-66HD-670M](https://comparepv.com/panel/solarspace-ss9-66hd-670m) | 670 W | -35 W, hotter, -1.1 pp | | [Solarspace SS9-66HD-675N](https://comparepv.com/panel/solarspace-ss9-66hd-675n) | 675 W | -30 W, -1.0 pp | | [Solarspace SS9-66HD-680N](https://comparepv.com/panel/solarspace-ss9-66hd-680n) | 680 W | -25 W, -0.8 pp | | [Solarspace SS9-66HD-685N](https://comparepv.com/panel/solarspace-ss9-66hd-685n) | 685 W | -20 W, -0.6 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +100 W, cooler, +2.4 pp | --- Source: https://comparepv.com/panel/solarspace-ss9-66hd-705n 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.