--- title: "Runergy SS9-66HD-645M 645W Solar Panel - Specs & Review | ComparePV" description: "Runergy SS9-66HD-645M 645W solar panel. Specs: 20.76% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/runergy-ss9-66hd-645m" updated: 2026-09-11 --- # Runergy SS9-66HD-645M Strong in heat, modest efficiency 217 panels in the segment PERC 600-650 W ## Identity - **Manufacturer:** Runergy - **Model:** SS9-66HD-645M - **Series:** SS9-66HD 645-665M (Lumina I) - **Rated power:** 645 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 600-650 W (217 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 645 W | 605 W | Strong - top 7% | | | Module efficiency | 20.76% | 21.38% | Weak - bottom 11% | 10,612 | | Power density | 207.6 | 213.8 | Weak - bottom 12% | 10,562 | | Temperature coefficient | -0.330 | -0.340 | Strong - top 6% | 8,545 | | Weight (kg) | 37.5 kg | 34.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.76% | 21.38% | Weak - bottom 11% | 10,612 | | Power density | 207.6 | 213.8 | Weak - bottom 12% | 10,562 | | Temperature coefficient | -0.330 | -0.340 | Strong - top 6% | 8,545 | | Weight per kWp | 58.1 | 55.7 | Typical | 11,573 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **-0.330 %/°C temperature coefficient** - Top 6% of the PERC 600-650 W segment, against a median of -0.340. Ranked 8,545th in the whole database. ### Watch out for - **20.76% module efficiency** - Bottom 11% of the PERC 600-650 W segment, against a median of 21.38%. - **207.6 watts per square metre** - Bottom 12% of the PERC 600-650 W segment, against a median of 213.8. - **Best for:** Commercial, utility-scale and shaded-installations. - **Not ideal for:** Tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 645 W - **Efficiency:** 20.76 % - **Voltage at Pmax (Vmp):** 37.71 V - **Current at Pmax (Imp):** 17.11 A - **Open-circuit voltage (Voc):** 45.31 V - **Short-circuit current (Isc):** 18.11 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.330 %/degC - **Temperature coefficient of Voc:** -0.260 %/degC - **Temperature coefficient of Isc:** 0.046 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **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:** 207.6 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 85.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.45 % - **Output after 30 years:** 548 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 10612 of 14005 | | Power density | 10562 of 14005 | | Temperature coefficient | 8545 of 14005 | | Weight | 11573 of 14005 | | Warranty | 21 of 14005 | ## About this series The Runergy SS9-66HD 645-665M (Lumina I) series is designed to maximize energy yield in large installations, where every square meter and the costs associated with construction and cabling are crucial. These are **bifacial modules** with a glass-on-glass construction, allowing them to effectively utilize both direct and reflected sunlight from the ground - which significantly improves energy production on PV farms and industrial rooftops. The use of **half-cut monocrystalline cells** minimizes losses and improves stability under partial shading, which is important in long rows of panels or when there are obstructions on the roof. The modules utilize a **multi-bin MBB architecture**, which supports reliable connections and better current collection from the cells. Another key feature is the **long linear power warranty**, which is important for investors focused on predictable LCOE (Levelized Cost of Energy). Lumina I is a good choice for solar farms, logistics halls, and commercial projects where durability, yield, and safety are important. ## Notable figures - Module efficiency of 20.8% is 0.6pp below average for \*\*PERC 600-650W\*\* panels (median: 21.4%) - At 207.6 W/m², this panel generates 6.2 W/m² less per unit area than \*\*PERC 600-650W\*\* median (213.8 W/m²) - Temperature coefficient of -0.33%/°C matches the \*\*PERC 600-650W\*\* median - At 37.5 kg, this panel is 3.5 kg heavier than the \*\*PERC 600-650W\*\* median (34.0 kg) - more demanding for installation crews - 70% bifaciality enables rear-side power generation, boosting yield by 4-10% on reflective surfaces ## Questions ### Is the Runergy SS9-66HD 645-665M (Lumina I) series still available for purchase? The Runergy Lumina I (SS9-66HD 645-665M) series has been discontinued and is no longer offered as a new product through regular distribution channels. If you need modules with similar specifications from Runergy or another Tier 1 manufacturer, we recommend contacting your distributor for currently available successors in the same power class. ### What is the maximum power output of the Runergy Lumina I panels and what installations are they designed for? The top module in the SS9-66HD series reaches 665 Wp, with the full series spanning 645-665 Wp. These output levels make Lumina I well suited to large-scale commercial and industrial installations — utility-scale PV farms, logistics facility rooftops, and warehouses — where maximizing energy yield per square meter and minimizing BoS cost per kilowatt are the primary goals. ### What practical benefit does the bifacial design of the Runergy Lumina I offer, and is it worth the premium? The bifacial glass-glass construction of the Lumina I allows the module to harvest energy from both the front side and from light reflected off the ground surface. On farms with light-colored gravel or snow cover, this translates to a real production gain of several to over ten percent without adding more array area. The glass-glass encapsulation also extends module service life and reduces the risk of micro-cracks. ### What warranty comes with the Runergy SS9-66HD 645-665M (Lumina I) panels? Runergy provides a 12-year product warranty covering material and manufacturing defects, along with a 30-year linear power output warranty. The linear power warranty guarantees a defined minimum performance level throughout that entire period, enabling precise LCOE modeling and return-on-investment planning for commercial and utility-scale projects. ### Does the half-cut PERC cell technology in the Runergy Lumina I improve performance under partial shading? Yes. Monocrystalline PERC cells split in half reduce internal resistance and limit shading losses because each half-cell operates independently. In long tracker rows or on rooftops with obstructions such as HVAC units, shading one section of the module does not degrade the entire string to the same degree as it would with full-size conventional cells. ### What is MBB architecture in the Lumina I panels and how does it affect installation reliability? MBB (multi-busbar) is the multi-wire interconnection architecture used in the SS9-66HD series. More and thinner busbars shorten the current path within each cell, reduce mechanical stress, and improve resistance to micro-cracks caused by transportation or thermal cycling. The result is lower resistive losses over the module's lifetime and higher overall reliability compared to conventional 3-busbar designs. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/ss9-66hd-m-1-53a17cf6cc95.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +4.4 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, lighter, +4.4 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, lighter, +4.2 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +4.2 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +50 W, cooler, +4.1 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +4.0 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | Cooler, lighter, +4.0 pp | | [Runergy SS9-66HD-650M](https://comparepv.com/panel/runergy-ss9-66hd-650m) | 650 W | Very close match | | [Runergy SS9-66HS-655M](https://comparepv.com/panel/runergy-ss9-66hs-655m) | 655 W | Lighter, +0.3 pp, -5 yr warranty | | [Runergy SS9-66HD-660M](https://comparepv.com/panel/runergy-ss9-66hd-660m) | 660 W | +15 W, +0.5 pp | | [Runergy SS9-66HD-665M](https://comparepv.com/panel/runergy-ss9-66hd-665m) | 665 W | +20 W, +0.6 pp | | [Runergy SS9-66HS-670M](https://comparepv.com/panel/runergy-ss9-66hs-670m) | 670 W | Lighter, +0.8 pp, -5 yr warranty | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +160 W, cooler, +4.3 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +155 W, cooler, +4.1 pp | | [AIKO AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 W | +150 W, cooler, +4.0 pp | | [AIKO AIKO-A790-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a790-grh78dw) | 790 W | +145 W, cooler, +3.8 pp | --- Source: https://comparepv.com/panel/runergy-ss9-66hd-645m Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.