--- title: "Solarspace SSA-66HD-590N 590W Solar Panel - Specs & Review | ComparePV" description: "Solarspace SSA-66HD-590N 590W solar panel. Specs: 21.84% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/solarspace-ssa-66hd-590n" updated: 2026-09-11 --- # Solarspace SSA-66HD-590N Middle of its segment, modest efficiency 259 panels in the segment N-type 550-600 W ## Identity - **Manufacturer:** Solarspace - **Model:** SSA-66HD-590N - **Series:** SSA-66HD 590-620N (Lumina II) - **Rated power:** 590 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 550-600 W (259 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 590 W | 580 W | Strong - top 15% | | | Module efficiency | 21.84% | 22.45% | Weak - bottom 10% | 6,985 | | Power density | 218.4 | 224.5 | Weak - bottom 11% | 6,954 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 32.5 kg | 29.5 kg | Weak - bottom 24% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.84% | 22.45% | Weak - bottom 10% | 6,985 | | Power density | 218.4 | 224.5 | Weak - bottom 11% | 6,954 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 55.1 | 52.3 | Weak - bottom 24% | 9,503 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **21.84% module efficiency** - Bottom 10% of the N-type 550-600 W segment, against a median of 22.45%. - **218.4 watts per square metre** - Bottom 11% of the N-type 550-600 W segment, against a median of 224.5. - **55.1 kg per kWp** - Bottom 24% of the N-type 550-600 W segment, against a median of 52.3. - **Best for:** Commercial, utility-scale and hot-climate. - **Not ideal for:** Tight roof space, roofs where every square metre has to count and weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 590 W - **Efficiency:** 21.84 % - **Voltage at Pmax (Vmp):** 40.19 V - **Current at Pmax (Imp):** 14.70 A - **Open-circuit voltage (Voc):** 48.18 V - **Short-circuit current (Isc):** 15.62 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:** 218.4 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:** 516 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 6985 of 14005 | | Power density | 6954 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 9503 of 14005 | | Warranty | 21 of 14005 | ## About this series The Solarspace SSA-66HD 590-620N (Lumina II) series has been designed to maximize energy yield in installations where every square meter counts. The use of **N-type cells in TOPCon technology** helps to minimize typical power losses over time and maintain the module's high efficiency for years, even under varying weather conditions. The **bifacial dual-glass** construction allows for efficient use of reflected light from the ground, which translates into real benefits, especially on flat roofs, ground-mounted structures, and PV farms. Another notable feature is **excellent performance at high temperatures**, which means the installation loses less efficiency on hot days - a significant advantage in Poland during the summer, especially on dark roofing materials. The modules have **high mechanical strength**, making it easier to design installations in locations exposed to wind and snow loads. Lumina II is a suitable choice for commercial and industrial investors, PV farm developers, and projects where stable yields and predictable operation are a priority. ## Notable figures - Efficiency of 21.8% is 0.6pp below the \*\*N-type 550-600W\*\* median (22.4%) - Power density of 218.4 W/m² is 6.1 W/m² below \*\*N-type 550-600W\*\* median (224.5 W/m²) - needs more roof space - At -0.29%/°C, hot weather performance is typical for \*\*N-type 550-600W\*\* panels - At 32.5 kg, this panel is 3.0 kg heavier than the \*\*N-type 550-600W\*\* median (29.5 kg) - more demanding for installation crews - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof ## Questions ### What is TOPCon technology in Solarspace Lumina II panels and how does it compare to PERC? TOPCon (Tunnel Oxide Passivated Contact) N-type cells achieve higher efficiency than conventional PERC cells and exhibit lower linear degradation rates. In practice, the Solarspace SSA-66HD retains more of its rated output over time and performs better in high temperatures and diffuse-light conditions — both of which matter significantly in real-world installations where weather variability is constant. ### What warranty does the Solarspace SSA-66HD 590-620N Lumina II carry? Solarspace backs the Lumina II series with a 12-year product warranty and a 30-year linear power output warranty. The 30-year power guarantee means the module must retain a minimum specified efficiency throughout its operational life — one of the longer warranty standards on the market and a key factor when calculating LCOE for commercial or utility-scale projects. ### Is the Solarspace Lumina II bifacial panel suitable for ground-mount systems and solar farms? Yes, the bifacial dual-glass design of the SSA-66HD series is especially effective in ground-mount and utility-scale installations where the rear side of the module captures albedo light reflected from the surface below. The bifacial gain is most pronounced with bright ground materials such as gravel, white membranes, or light soil, combined with adequate clearance height — both standard in solar farm layouts. ### How does the Solarspace SSA-66HD 590-620N perform in high temperatures during summer? N-type TOPCon cells have a lower temperature coefficient of Pmax compared to PERC cells, meaning the Lumina II loses less output on hot summer days. This is particularly relevant for rooftop installations on dark-colored roofing materials, where module temperature can exceed ambient air temperature by 20–30°C, significantly cutting into daily energy yield. ### What is the maximum power output of the Solarspace SSA-66HD and how many variants does the series include? The SSA-66HD 590-620N series spans peak power ratings from 590 Wp to 620 Wp across multiple bin variants. The top-tier 620 Wp module sits firmly in the high-power 66-cell category. This range lets designers select the specific wattage that best fits their BoS configuration, string sizing, and inverter MPPT requirements. ### Is Solarspace a Tier 1 manufacturer and is it a safe choice for a large commercial PV installation? Yes, Solarspace is recognized as a Tier 1 manufacturer by BloombergNEF, reflecting a positive bankability assessment — lenders are more willing to finance projects using Tier 1 modules. The company is headquartered in China, which is standard for most global PV manufacturers. Tier 1 status is primarily a financial rating, but it is a critical criterion when securing project financing for commercial and utility-scale installations. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/ssa-66hd-n-1-393cb4a7f3de.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | -30 W, lighter, +3.0 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | +50 W, lighter, +3.0 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | -35 W, lighter, +2.8 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +45 W, lighter, +2.8 pp | | [AIKO AIKO-A630-MAH72Dw](https://comparepv.com/panel/aiko-aiko-a630-mah72dw) | 630 W | +40 W, cooler, +2.6 pp | | [Longi Solar LR7-60HVHL-550M](https://comparepv.com/panel/longi-lr7-60hvhl-550m) | 550 W | -40 W, 16 kg lighter, +2.6 pp | | [Solarspace SSA-66HD-595N](https://comparepv.com/panel/solarspace-ssa-66hd-595n) | 595 W | Very close match | | [Solarspace SSA-66HD-600N](https://comparepv.com/panel/solarspace-ssa-66hd-600n) | 600 W | +10 W, +0.4 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 | +20 W, +0.7 pp | | [Solarspace SSA-66HD-615N](https://comparepv.com/panel/solarspace-ssa-66hd-615n) | 615 W | +25 W, +0.9 pp | | [Solarspace SSA-66HD-620N](https://comparepv.com/panel/solarspace-ssa-66hd-620n) | 620 W | +30 W, +1.1 pp | | [Solarspace SSA-66HD-625N](https://comparepv.com/panel/solarspace-ssa-66hd-625n) | 625 W | +35 W, +1.3 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +90 W, lighter, +3.4 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +85 W, lighter, +3.2 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +110 W, cooler, +3.2 pp | --- Source: https://comparepv.com/panel/solarspace-ssa-66hd-590n 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.