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Solarspace Brand review

SS9-66HD-675N

675 Wp N-type Bifacial 80%
ComparePV verdict

Middle of its segment, heavy for its output

Rank 2,167 of 14,005
Compare panels Datasheet PDF
Power (Wp)
675
Strong · top 24%
Efficiency (%)
21.73
Weak · bottom 15%
Density (Wp/m²)
217.3
Weak · bottom 15%
Temp (%/°C)
-0.290
Typical · median -0.290
Weight (kg)
37.5
Weak · 4.0 kg above median
Warranty (yrs)
30
Typical · median 30 yrs

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.

Ranking

109 panels in the segment N-type 650-700 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.73% 23.30% Weak · bottom 15% 7,370
Power density 217.3 233.2 Weak · bottom 15% 7,349
Temperature coefficient -0.290 -0.290 Typical 2,165
Weight per kWp 55.6 50.9 Weak · bottom 11% 9,899
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 · 3 caution
Best for

Utility-scale, commercial, hot-climate and shaded-installations.

Not ideal for

Weight-limited structures, tight roof space and roofs where every square metre has to count.

Watch-outs
55.6 kg per kWp

Bottom 11% of the N-type 650-700 W segment, against a median of 50.9.

21.73% module efficiency

Bottom 15% of the N-type 650-700 W segment, against a median of 23.30%.

217.3 watts per square metre

Bottom 15% of the N-type 650-700 W segment, against a median of 233.2.

Notes from the database
  • Efficiency of 21.7% is 1.6pp below the N-type 650-700W median (23.3%)
  • Power density of 217.3 W/m² is 15.9 W/m² below N-type 650-700W median (233.2 W/m²) - needs more roof space
  • At -0.29%/°C, hot weather performance is typical for N-type 650-700W panels
  • At 37.5 kg (4.0 kg above N-type 650-700W median of 33.5 kg), requires checking roof load capacity
  • Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface

Specifications

Open datasheet PDF
Nominal power (Pmax) 675 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.73 % Weak Segment median 23.30%
Vmpp · Impp 39.50 V · 17.10 A Operating point at max power
Voc · Isc 47.30 V · 18.13 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 Weak Weak · 4.0 kg above median
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 12 years Hardware defects only
Performance warranty 30 years Typical median 30 yrs · median 30 yrs
End-of-warranty output 87.4 % Equals 590 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 675 Wp appear here. The rest cover the whole series.

30-Year Linear Power Warranty 30-Year Linear Power Warranty 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-675N 675 W 21.73% -0.290 37.5 kg You are here
AIKO-A650-MAE72Mw 650 W 25.20% -0.260 27.0 kg Cooler, lighter, +3.5 pp
AIKO-A680-MDE72Mw 680 W 25.20% -0.260 29.0 kg Cooler, lighter, +3.5 pp
AIKO-A675-MDE72Mw 675 W 25.00% -0.260 29.0 kg Cooler, lighter, +3.3 pp
AIKO-A645-MAE72Mw 645 W 25.00% -0.260 27.0 kg -30 W, lighter, +3.3 pp
AIKO-A700-MAE78Dw 700 W 25.00% -0.260 34.5 kg Cooler, lighter, +3.3 pp
AIKO-A695-MAE78Dw 695 W 24.90% -0.260 34.5 kg Cooler, lighter, +3.2 pp
AIKO-G670-MCH72Mw 670 W 24.80% -0.260 28.2 kg Cooler, lighter, +3.1 pp
SS9-66HD-645M 645 W 20.76% -0.330 37.5 kg -30 W, hotter, -1.0 pp
SS9-66HD-650M 650 W 20.92% -0.330 37.5 kg -25 W, hotter, -0.8 pp
SS9-66HD-655M 655 W 21.09% -0.330 37.5 kg -20 W, hotter, -0.6 pp
SS9-66HD-660M 660 W 21.25% -0.330 37.5 kg -15 W, hotter, -0.5 pp
SS9-66HD-665M 665 W 21.41% -0.330 37.5 kg -10 W, hotter, -0.3 pp
SS9-66HD-670M 670 W 21.57% -0.330 37.5 kg Hotter
SS9-66HD-680N 680 W 21.89% -0.290 37.5 kg Very close match
SS9-66HD-685N 685 W 22.05% -0.290 37.5 kg +10 W, +0.3 pp
AIKO-A805-GRH78Dw 805 W 25.10% -0.260 39.8 kg +130 W, cooler, +3.4 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 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.
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