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Solarspace Brand review

SS9-66HD-705N

705 Wp N-type Bifacial 80%
ComparePV verdict

Solid all-round for its segment

Rank 738 of 14,005
Compare panels Datasheet PDF
Power (Wp)
705
Typical for its class
Efficiency (%)
22.70
Typical · median 22.88%
Density (Wp/m²)
227.0
Typical · median 228.6
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
37.5
Typical · median 38.0 kg
Warranty (yrs)
30
Typical · median 30 yrs

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.

Ranking

90 panels in the segment N-type 700-750 W
Metric This panel Median Position in segment Overall 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
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

0 positive · 0 caution
Best for

Utility-scale, commercial, hot-climate and cold-climate.

Notes from the database
  • 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

Specifications

Open datasheet PDF
Nominal power (Pmax) 705 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 22.70 % Typical Segment median 22.88%
Vmpp · Impp 40.70 V · 17.33 A Operating point at max power
Voc · Isc 48.40 V · 18.36 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 2384×1303×33 mm · 3.11 m² of roof
Weight 37.5 kg Typical Typical · median 38.0 kg
Cells 132 · N-type Monocrystalline
Bifaciality 80 % Rear output as a share of front
Coefficient Pmax -0.290 %/°C Typical median -0.290 of its segment
Coefficient Voc · Isc -0.260 · 0.045 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 15 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 616 W guaranteed
Degradation 1.00 → 0.40 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by Solarspace in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 705 Wp appear here. The rest cover the whole series.

30-Year Linear Power Warranty (Module Power Output over Time) 30-Year Linear Power Warranty (Module Power Output over Time) Whole series

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-
With bifacial gain
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.290 %/°C against a segment median of -0.290
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Filter these
Size
Panel Power Eff. Temp. Weight Difference
Solarspace SS9-66HD-705N 705 W 22.70% -0.290 37.5 kg You are here
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, lighter, +2.5 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg -30 W, lighter, +2.3 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg Cooler, lighter, +2.3 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg Cooler, lighter, +2.2 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg -35 W, lighter, +2.1 pp
LR7-72HVHF-670M 670 W 24.80% -0.260 28.5 kg -35 W, lighter, +2.1 pp
JKM650-670N-66QL6-BDV (670W class) 670 W 24.80% -0.260 32.5 kg -35 W, lighter, +2.1 pp
SS9-66HD-645M 645 W 20.76% -0.330 37.5 kg -60 W, hotter, -1.9 pp
SS9-66HD-650M 650 W 20.92% -0.330 37.5 kg -55 W, hotter, -1.8 pp
SS9-66HD-655M 655 W 21.09% -0.330 37.5 kg -50 W, hotter, -1.6 pp
SS9-66HD-660M 660 W 21.25% -0.330 37.5 kg -45 W, hotter, -1.4 pp
SS9-66HD-665M 665 W 21.41% -0.330 37.5 kg -40 W, hotter, -1.3 pp
SS9-66HD-670M 670 W 21.57% -0.330 37.5 kg -35 W, hotter, -1.1 pp
SS9-66HD-675N 675 W 21.73% -0.290 37.5 kg -30 W, -1.0 pp
SS9-66HD-680N 680 W 21.89% -0.290 37.5 kg -25 W, -0.8 pp
SS9-66HD-685N 685 W 22.05% -0.290 37.5 kg -20 W, -0.6 pp
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +100 W, cooler, +2.4 pp

Found 1390 panels of the same or similar size to this one, within ±10 mm. See them here Found 1400 panels of the same or similar size to this one, within ±25 mm. See them here Found 1400 panels of the same or similar size to this one, within ±50 mm. See them here Found 1432 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
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.
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