--- title: "Solarspace SSA-66HD-620N 620W Solar Panel - Specs & Review | ComparePV" description: "Solarspace SSA-66HD-620N 620W solar panel. Specs: 22.95% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/solarspace-ssa-66hd-620n" updated: 2026-09-11 --- # Solarspace SSA-66HD-620N Solid all-round for its segment 359 panels in the segment N-type 600-650 W ## Identity - **Manufacturer:** Solarspace - **Model:** SSA-66HD-620N - **Series:** Lumina II / SSA-66HD 595-625N - **Rated power:** 620 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 600-650 W (359 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 620 W | 625 W | Typical | | | Module efficiency | 22.95% | 22.77% | Typical | 2,268 | | Power density | 229.5 | 227.7 | Typical | 2,191 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 32.5 kg | 32.5 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.95% | 22.77% | Typical | 2,268 | | Power density | 229.5 | 227.7 | Typical | 2,191 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 52.4 | 52.7 | Typical | 5,893 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Commercial, utility-scale and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 620 W - **Efficiency:** 22.95 % - **Voltage at Pmax (Vmp):** 41.03 V - **Current at Pmax (Imp):** 15.12 A - **Open-circuit voltage (Voc):** 49.38 V - **Short-circuit current (Isc):** 15.98 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:** 2382 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 32.5 kg - **Area:** 2.70 m2 - **Power density:** 229.5 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:** 542 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 2268 of 14005 | | Power density | 2191 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 5893 of 14005 | | Warranty | 21 of 14005 | ## About this series The Solarspace Lumina II / SSA-66HD 595-625N series is designed to maximize energy yields under real-world operating conditions, particularly where long-term production stability is crucial. The use of **N-type TOPCon** cells helps minimize degradation-related losses and maintains high efficiency even under variable solar irradiance. These are **bifacial** modules in a **dual glass** configuration, allowing them to better utilize reflected light from the ground while also enhancing their durability in harsher environments (wind, humidity, mechanical stress). This translates to more predictable energy production and a reduced risk of power drops over time. The Lumina II series also offers **long-term performance**, making it easier to plan the return on investment in commercial projects. The series is suitable for both large-scale PV farms and rooftops of warehouses, factories, and industrial buildings, where high power density and durability are essential. Thanks to its **favorable performance at higher temperatures**, the modules help maintain energy production even during the summer months, when many panels experience significant power losses due to overheating. ## Notable figures - At 22.9% efficiency, this panel is on par with typical \*\*N-type 600-650W\*\* modules - At 229.5 W/m² power density, roof space requirements are typical for \*\*N-type 600-650W\*\* panels - Temperature coefficient of -0.29%/°C matches the \*\*N-type 600-650W\*\* median - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof - Ranked #2268 out of 14005 panels for efficiency in the database ## Questions ### What warranty comes with the Solarspace Lumina II SSA-66HD 595-625N solar panels? The Lumina II series is backed by a 15-year product warranty covering defects and workmanship, along with a 30-year linear power warranty guaranteeing at least 87.4% of rated output at end of term. This is one of the longer warranty packages in the commercial segment, making long-term yield modeling and ROI planning significantly more straightforward for large PV projects. ### What is N-type TOPCon technology and why choose it over standard PERC? N-type TOPCon cells deliver a lower degradation rate and smaller annual power losses compared to conventional PERC technology. The Lumina II modules feature a temperature coefficient of approximately -0.29%/°C, meaning less power loss on hot summer days. Over the full system lifetime this translates to higher energy yields and a more competitive LCOE when compared to previous-generation PERC-based modules. ### Are the Solarspace Lumina II SSA-66HD panels suitable for industrial rooftop installations? Yes, the Lumina II series is specifically designed for commercial and industrial applications. The 66-cell half-cut format (132 G12R cells) delivers up to 625 Wp of power density per module, while the dual glass construction improves mechanical resistance to wind, snow loads, and moisture ingress. These modules are well suited for flat or low-pitch rooftops on warehouses, logistics centers, and manufacturing facilities where durability and minimal maintenance are priorities. ### Does bifacial dual glass make sense for a typical ground-mounted solar farm? Absolutely. Bifacial panels generate additional electricity from light reflected off the ground surface. On light-colored gravel, white geomembrane, or snow, the bifacial gain typically adds 5-15% to annual energy production. The glass-glass (dual glass) construction also extends module service life and moisture resistance, which is a key advantage for ground-mounted systems exposed to harsh environmental conditions over several decades. ### What are the dimensions and weight of the SSA-66HD 625N panels, and do they pose any installation challenges? The SSA-66HD modules measure approximately 2382 x 1134 x 30 mm and weigh around 32.8 kg each. Dual glass modules are heavier than their backsheet counterparts, requiring a reinforced racking structure and at least two installers for safe handling and placement. This is a commercial-format module not recommended for standard residential rooftop installations. ### Is Solarspace a Tier 1 manufacturer and does that affect project financing for Lumina II installations? Yes, Solarspace holds Tier 1 status according to Bloomberg NEF and ranks among the top global solar cell shipment leaders. Tier 1 classification has a direct practical impact: most project finance banks and lending institutions accept these modules as eligible collateral for PV project loans, and insurers are more willing to cover installations using recognized Tier 1 equipment under standard commercial policies. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/ssa-66hd-n-db85cafb44d5.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +30 W, lighter, +2.2 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +2.1 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +50 W, lighter, +1.9 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +50 W, lighter, +1.9 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +1.9 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +50 W, cooler, +1.9 pp | | [Solarspace SSA-66HD-590N](https://comparepv.com/panel/solarspace-ssa-66hd-590n) | 590 W | -30 W, -1.1 pp | | [Solarspace SSA-66HD-595N](https://comparepv.com/panel/solarspace-ssa-66hd-595n) | 595 W | -25 W, -0.9 pp | | [Solarspace SSA-66HD-600N](https://comparepv.com/panel/solarspace-ssa-66hd-600n) | 600 W | -20 W, -0.7 pp | | [Solarspace SSA-66HD-605N](https://comparepv.com/panel/solarspace-ssa-66hd-605n) | 605 W | -15 W, -0.6 pp | | [Solarspace SSA-66HD-610N](https://comparepv.com/panel/solarspace-ssa-66hd-610n) | 610 W | -10 W, -0.4 pp | | [Solarspace SSA-66HD-615N](https://comparepv.com/panel/solarspace-ssa-66hd-615n) | 615 W | Very close match | | [Solarspace SSA-66HD-625N](https://comparepv.com/panel/solarspace-ssa-66hd-625n) | 625 W | Very close match | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +60 W, lighter, +2.2 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +55 W, lighter, +2.1 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +80 W, cooler, +2.1 pp | --- Source: https://comparepv.com/panel/solarspace-ssa-66hd-620n 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.